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A power based approach for the selection and comparison of ball mill liners Mejia Alarcon, Olav 2018

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  A POWER BASED APPROACH FOR THE SELECTION AND COMPARISON OF BALL MILL LINERS  by Olav Mejia Alarcon B.A., Univ. Nac. Mayor de San Marcos, 1992 A THESIS SUBMITTED IN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE DEGREE OF   MASTER OF APPLIED SCIENCE in THE FACULTY OF GRADUATE AND POSTDOCTORAL STUDIES (Mining Engineering)  THE UNIVERSITY OF BRITISH COLUMBIA (Vancouver)    April 2018  © Olav Mejia Alarcon, 2018  ii  Abstract  Current technology and simulation software used in the mining industry fail to factor in the effect of liner type and wear on ball mill grinding efficiency and throughput. This thesis provides a comprehensive analysis of key mill operating parameters and addresses the following key research question: how does liner type, lifter face angle, and liner wear affect mill grinding efficiency? The hypothesis is a lifter’s face angle drive a ball mill’s grinding efficiency and throughput independently of the type of liner used. To test this hypothesis, plant data and the profile and lifter face angle of the three most widely used liners are analyzed in terms of mill power draw using Morrell’s model C and MillTraj®. Results show the mill ball charge shoulder angle is strongly affected by the liner lifter’s face angle and that Morrell’s Model C could be improved by including a correction parameter that reflects the power draw of a mill along the service life of its liner. The correction parameter is to reflect the effect of wear on the shoulder angle. Results show that mill grinding efficiency decreases as the liner wears but that efficiency can still be maintained by adjusting the mill speed. The operating work index was found to be an effective tool for identifying increased grinding inefficiency along the liner’s service life. Further research is required to include a wear parameter that indicates the liner profile in Morell’s Model C power equations. It is also necessary to carry out additional research on variable speed drivers (VSD) for mill motors, which could potentially pay back the cost of adding a VSD on ball mills due to the increased grinding efficiency. iii  Lay Summary  The objective of this research study was to provide a better predictive model for the selection of mill liners by estimating a mill power draw using simulated ball trajectories inside the mill. The correct selection of liners and mill operation based on the understanding of the relationship between mill power draw and ball trajectory contribute in increasing energy efficiency in the beneficiation of minerals. Ball mill energy consumption can be improved by changing its rotational speed when grinding efficiency decreases or by modifying the  mill liner shape in a way that ball trajectory can be maintained within an optimum range for the longest period of time possible.   iv  Preface  This dissertation is an original intellectual product of the author, O. Mejia Alarcon. The analysis or conclusions of this dissertation have not been published. Under the supervision of Dr. Bern Klein, Professor at NBK Institute of Mining Engineering at UBC, I was responsible for the research, data analysis, simulations, engineering calculations and interpretation of the results.   v  Table of Contents  Abstract ...................................................................................................................................... ii Lay Summary ........................................................................................................................... iii Preface ....................................................................................................................................... iv Table of Contents ...................................................................................................................... v List of Tables .......................................................................................................................... viii List of Figures ........................................................................................................................... ix Chapter 1: Introduction ........................................................................................................... 1 Chapter 2: Literature Review .................................................................................................. 5 2.1 Ball Mill Grinding ................................................................................................................... 5 2.1.1 Energy Required for Size Reduction ...................................................................... 6 2.1.2 Ball Mill Power Draw – Bond Approach ............................................................... 7 2.1.3 Mill Power Draw – Steve Morrell’s Approach ....................................................... 9 2.2 Grinding Efficiency Comparison .......................................................................................... 13 2.3 Mill Liners ............................................................................................................................. 13 2.4 Modelling the Influence of Liner Profile on Ball mill Performance ..................................... 19 2.5 DEM Software Limitations ................................................................................................... 22 2.6 MillTraj® Software ............................................................................................................... 23 2.7 Theories of Influence Summary ............................................................................................ 27 vi  Chapter 3: Methodology ........................................................................................................ 29 3.1 Measurements ....................................................................................................................... 31 3.2 Calculations ........................................................................................................................... 32 Chapter 4: Comparing Ball Charge when Using Different Type of Liners ...................... 35 4.1 Mill Volume Inside Liners .................................................................................................... 35 4.2 Weight of the grinding media (steel balls) inside the Ball Mill ............................................ 38 4.3 Ball Mill Power Draw Due to the Ball Charge ..................................................................... 38 4.3.1 Bond Approach ..................................................................................................... 38 4.3.2 Morrell Approach (Morrell, 1996) ........................................................................ 38 4.4 Comparison of Ball Charge and Power draw when using different type of Liners ............... 39 4.5 Impact of Weight of Different Types of Liners on Power draw ........................................... 42 4.6 Impact of different type of Liners on Power draw ................................................................ 43 Chapter 5: Assessment of Ball Mill Speed for Different Types of Liners ......................... 47 5.1 Power Draw ........................................................................................................................... 47 5.2 Ball Trajectory ...................................................................................................................... 52 5.2.1 Liner Lifter Shapes ............................................................................................... 53 5.2.2 Ball Trajectory and Mill Power Draw .................................................................. 53 5.3 Ball Mill Speed ..................................................................................................................... 58 5.3.1 Liner Lifting Capacity, Ball Trajectory and Grinding Efficiency ........................ 59 5.3.2 Liner Type Power Draw Comparison at Different Mill Speeds and Service Life 67 5.3.3 Effect of Mill Speed on the Grinding Efficiency .................................................. 69 vii  Chapter 6: Discussion ............................................................................................................. 71 6.1 Mill Power Draw and Ball Trajectory-Mill Charge Shoulder Angle .................................... 71 6.2 Calibration factor ‘k’ in Model C .......................................................................................... 73 6.3 Mill Charge Shoulder Angle and Mill efficiency .................................................................. 73 6.4 Liner Types ........................................................................................................................... 74 6.5 Operating Work Index ........................................................................................................... 74 6.6 Maintaining Ball Mill Efficiency by Increasing Liner Change Frequency – Scenario 1 ...... 75 6.7 Maintaining Ball Mill Efficiency by Operating a Ball Mill at High Speed – Scenario 2 ..... 78 6.8 Limitations and Future Work ................................................................................................ 80 Chapter 7: Conclusions and Recommendations .................................................................. 81 Reference List .......................................................................................................................... 85 Appendices ............................................................................................................................... 90 Appendix 1: Total Power Draw and Shoulder Angle from Model “C” ............................................. 90 Appendix 2: Model “C” Power Draw Vs. Liner Service Life at 75% Crt.Sp .................................... 91 Appendix 3: Model “C” Power Draw Vs. Liner Service Life at 80-85% Crt.Sp ............................... 94 Appendix 4: MillTraj® Simulations .................................................................................................. 97 Appendix 5: Mill Calculated Ratios from Plant 1 and 2 .................................................................. 112    viii  List of Tables Table 2-1 Power effect of Lifters .................................................................................................. 16 Table 4-1  (A) Mill Power Draw  Using MillTraj angles and (B) Using the Model “C” ............. 40 Table 4-2 Power Draw by a 4.5mD x 6.0mL Ball mill ................................................................. 41 Table 4-3 Mill Power Draw when Using Different type of Liners – Rubber and Steel ............... 44 Table 4-4 Mill Power Draw when Using Different type of Liners – Magnetic Liner .................. 44 Table 5-1 Summary of Total Power Draw and Shoulder Angle From Model “C” ...................... 51 Table 5-2: Model C Power Draw Vs. Rubber Liner Service Life @75% CS .............................. 55 Table 5-3 Effect of Wear and Fraction  of Critical Speed on Mill Power Draw .......................... 61 Table 6-1 Comparison of Mill Power Draw Estimate Using Model C ......................................... 73 Table 6-2 Current Production and Operating Indicators ............................................................... 76 Table 6-3 Scenario 1 - Production and Operating Indicators ....................................................... 76 Table 6-4 Scenario 1- Benefits of Replacing Liner before the End of Life .................................. 77 Table 6-5 Increase of Power Draw Vs. Increase of Mill Power Draw ......................................... 79 Table 6-6 Scenario 2 - Production and Operating Indicators ....................................................... 79 Table 6-7 Scenario 2- Benefits of Replacing Liner before the End of Life .................................. 80      ix  List of Figures Figure 2-1 Simplified shape of active charge for grate discharge mills ....................................... 10 Figure 2-2 Model to Estimate the Power Draw of a Ball Mill-Cylindrical Portion ..................... 12 Figure 2-3 Model to Estimate the Power Draw of a Ball Mill-Conical Portion ........................... 12 Figure 2-4 Effect of Spacing/height of mill lifters (mill speed 25.5 rpm) .................................... 16 Figure 2-5 Relationship among Lifter height, distance and speed (Moller and Brough, 1989) ... 18 Figure 2-6 Ball Trajectories for 50 mm balls in a 5 m diameter mill at 75% of critical speed .... 19 Figure 2-7 Forces on a ball in contact with a lifter bar (Powell, 1991) ........................................ 24 Figure 2-8 Parabolic trajectory of a ball at its point of departure from lifter bar (Powell, 1991) 25 Figure 3-1 Measurement of liner lifter angles .............................................................................. 32 Figure 4-2 Rubber Liner (Moller and Brough,1989) .................................................................... 36 Figure 4-1 Steel Liner ................................................................................................................... 36 Figure 4-3 Metallic Magnetic Liner (HMR Technology Canada) ................................................ 37 Figure 4-4 Magnetic Field shape and height of a Metallic Magnetic Liner Magnetic Liner ........ 37 Figure 4-5 Liner Thickness Vs. Power Draw ............................................................................... 41 Figure 4-6 Power Draw Comparison of Different Type of Liner at 75% Critical Speed ............. 45 Figure 4-7 Shoulder Angle Comparison of Different Type of Liners .......................................... 46 Figure 5-1 Mill Power Draw Vs. Fraction of Theoretical Mill Speed .......................................... 49 Figure 5-2 Convention for describing Shoulder and Toe Angle of a mill ball Charge ................ 50 Figure 5-3 Shoulder Angle vs. fraction of critical speed .............................................................. 50 Figure 5-4 MillTraj® Software Convention on Measurement of AnglesLiner Lifter Shapes ..... 52 Figure 5-5 Type of Ball Mill Liners ............................................................................................. 54 Figure 5-6  MillTraj Simulation Results  ...................................................................................... 56 x  Figure 5-7 Ball Trajectory along the service life of a steel liner .................................................. 57 Figure 5-8 Ball Trajectory when using a magnetic liner .............................................................. 58 Figure 5-9 Shoulder Angle at Different Fraction of Critical Speed .............................................. 62 Figure 5-10 Ball Mill Operating Work Index within Liner Changes ........................................... 63 Figure 5-11 SAG Mill Operating Work Index within Liner Changes .......................................... 64 Figure 5-12 SAG Mill Operating Work and Critical Speed ......................................................... 65 Figure 5-13 Bond Work Index of SAG Mill Feed ........................................................................ 66 Figure 5-14 Power of Different Type of Liners at Different Speeds and 6 month Service Life .. 68 Figure 5-15 Power of Different Type of Liners at Different Speeds and 12 months Service Life68 Figure 5-16 Ball Mill Operating Work Index Frequency ............................................................. 70 Figure 6-1 Power Calculation Comparison................................................................................... 72 Figure 6-2 Cash Flow Vs. Relining Time ..................................................................................... 78          1  Chapter 1: Introduction Mill power draw analysis is a key parameter when comparing the different effects that liner types have on mill performance. Current technology and simulation software used in the mining industry fail to factor in the impact of liner wear profiles on grinding efficiency and mill throughput (Toor, 2013). To address this gap, this thesis provides a comprehensive analysis of key factors affecting mill throughput and grinding efficiency: mill speed, ball loading, and liner lifter face angle (angle between the lifter face in contact with a grinding ball and the lifter base). Its central hypothesis is that face angle drives a ball mill’s grinding efficiency and throughput independently of the type of liner used. To test this hypothesis, plant data, and the profile and lifter face angle of the three most widely used liners – steel, rubber and metallic magnetic – are analyzed. Mill power draw at different lifter face angles is estimated along each liner’s service life. The liners are examined in terms of ball trajectory and power draw as a measure of throughput. Several years of plant mill operating data, published research papers, and MillTraj® simulation results are used to demonstrate how face angles impact grinding efficiency and throughput. Moreover, the liner profile wear analyses clarifies a mismatch between actual and estimated power draw calculations which helps to improve grinding efficiency since optimizing a ball mill’s operation requires an assessment of its power draw. Morrell’s Model C (Morrell, 1996a) theory is commonly used to estimate power draw at a given point in a liner’s service life. Yet, these estimates differ from real operational power draw when a mill’s liner lifter has lost its lifting capacity as demonstrated in this Thesis. This discrepancy occurs because Model C relies on mill speed and volume of the charge to estimate the ball charge shoulder angle (angle of the 2  point in the mill shell circumference where particles diverge from the mill shell) and to estimate power draw; however, the ball charge’s shoulder angle changes as the liner lifter wears, causing the power draw to change as well. This mismatch between real and estimated power draw calculations remains unresolved, and, as this thesis demonstrates, hinders our understanding of the impact of liner type on mill grinding efficiency. This thesis resolves this mismatch by using a corrected shoulder angle in Morrell’s Model C equation. The corrected shoulder angle, which was obtained from MillTraj® software, simulates ball trajectory based on the mill’s liner profile and speed. This thesis also identifies when, during a liner’s service life, maximum grinding efficiency takes place by using the operating work index, Woi (OWi), as an identifier for the mill’s period of maximum grinding efficiency. In this thesis, Powell (1991) and Morrell’s (1996a) theories are used to assess the power draw of a ball mill while considering the liner geometry observed in real mill operations. Powell (1991)’s theory states that a mill’s lifter bar has a strong effect on ball trajectory only when the bar height increases from zero to slightly greater than one ball charge radius. It also states that the liner lifter face angle as well as the mill speed have a strong effect on the ball trajectory. Morrell’s (1996a) theory states that the mill power draw is based on the kinetic and potential energy that the mill shell provides to the charge, plus the energy required to rotate the mill shell itself which can be estimated from the motion of the grinding charge and its position on the mill internal circumference (shoulder angle). Powell’s theory is used to estimate the correct position of the mill charge (shoulder angle) and Morrell’s theory is used to estimate the mill power draw. Both theories are necessary to explain the advantages and disadvantages of each liner studied. Plant data is used to show how mill grinding efficiency and throughput change as a ball mill liner lifter 3  face angle changes over its service life. By using a corrected shoulder angle in the Model C calculation, this thesis predicts mill power draw as a function of liner lifter face angle and demonstrates that shoulder angle has a larger effect on grinding efficiency that the liner type selected. Thus, the objective of this thesis is to provide a better predictive model for the selection of mill liners by estimating a mill power draw using corrected shoulder angles as liners wear. The research questions that guided the objective for this thesis are:  What is the ball trajectory for each of the studied liner design profiles?  How will grinding efficiency be affected when using different types of liners?  How does the liner’s weight and thickness affect the total mill charge and throughput?  What is the power draw when using different types of liners?  What is the effect of having no lifters in grinding mills? This thesis uses the following format to lay out its design, methodology, analysis, results, conclusions, and contributions: - Chapter 2 outlines foundational mill liner research and theories that identify ball charge shoulder angle as an unseen parameter when estimating grinding efficiency and mill throughput. - Chapter 3 provides the methodology used to analyze the plant data and calculations defined in the literature review. The MillTraj®, Model C calculation results and operating plant data are also presented. - Chapter 4 describes the analysis of how liner types affect mill ball charge and mill power draw, demonstrating how liner thickness drives ball charge and thus power draw. 4  Evidence that the liner profile drives mill grinding efficiency and throughput is also provided.  - Chapter 5 analyses the effects of liner profiles and mill speed on ball trajectory. The effects of mill on throughput, ball trajectory, and efficiency as a factor of changing the ball charge shoulder angle position are also discussed.  - Chapter 6 concludes with a discussion of the overall effects liner design and operating parameters have on grinding efficiency. Two scenarios to improve ball mill grinding efficiency are discussed. The first scenario is to change liners before the efficiency drops. The second is to increase mill speed as grinding efficiency decreases.  - Chapters 7 provides conclusions and recommendations based on the study results. Contributions to current literature and Morrell’s Model C power equations are highlighted, and the economic impacts for utilizing rubber, steel, and metallic magnetic liners are discussed in light of the newly identified effect of lifter shoulder angles. Future directions for research, particularly for metallic magnetic liners and the economics of adding a variable speed driver on ball mills, complete this thesis. 5  Chapter 2: Literature Review This chapter reviews foundational research and current industry techniques for estimating mill power draw and the influence of mill liner types and design on ball mill grinding performance in terms of mill power draw and throughput. Reviewing this research identifies mill charge shoulder angle as an unseen parameter when estimating grinding efficiency, and new theories, specifically of the motion of the outer grinding elements in a rotary ball mill (Powell 1990), can be used to identify shoulder angles as drivers of mill grinding efficiency and throughput. Mill simulation software and sizing techniques rely on empirical equations to estimate a mill power draw under certain operating conditions and dimensions. However, current estimates are only valid at a certain time of the liner’s service life and not along its entire service life. This review discusses these limitations and related unresolved technical issues in the literature, as well as the correction required in Morrell’s Model C equation for accurately estimating power draw. 2.1  Ball Mill Grinding A ball mill is the main mechanical equipment for reducing ore size through the grinding action of balls cascading or cataracting as the mill shell rotates at a certain angular speed. The energy required to reduce the size of mineral particles in ball or AG/SAG (semi autogenous grinding) mills is calculated using Bond’s third theory or commercial software in case of AG/SAG mills. A mill’s power draw must meet or exceed the energy required for ore size reduction to take place. The amount of power that a ball mill can draw can be calculated using Rowland’s equation (2002) or Morrell’s Model C (1996). 6  2.1.1 Energy Required for Size Reduction  Bond (1952) defined the ball mill Work Index “Wi” as the amount of energy required to crush or grind ore from an infinite feed size to a size passing 80% of 100 microns. The energy required to reduce ore size from a feed size (F80) to a product size (P80) is given by Equation 2-1. This equation determines the mill’s energy requirement excluding motor transmission losses. 𝑾 = 𝑾𝒊(𝟏𝟎√𝑷−𝟏𝟎√𝑭)         Equation 2-1 Where, W  = Specific energy Wi  = Work index P = 80% passing size for the product F = 80% passing size for the feed However, this equation was developed when most operating data and samples were taken from operating 8-foot diameter rod and ball mills. When this equation is used for ball mill diameters larger than 8 feet, eight efficiency factors are applied to Equation 2-1 (Rowland, C. a ,2002). The efficiency factors are: EF1 – Dry Grinding. EF2 – Open Circuit Ball Milling. 7  EF3 – Diameter Efficiency Factor. EF4 – Oversized Feed. EF5 – Fine Grinding (to produce sizes of at least 80% passing 200 mesh (75μm)). EF6 – High or Low Ratio of Reduction Rod Milling. EF7 – Low Ratio of Reduction Ball Milling. EF8 – Rod Milling. The corrected specific energy is obtained by multiplying the efficiency factors times the specific energy “𝑾" from Equation 2-1. 2.1.2 Ball Mill Power Draw – Bond Approach Rowland (2006) describes the basis of Bond’s method to estimate the power that a tubular ball mill can draw. Ball charge and slurry content are required to calculate the ball mill’s power draw or the power required to lift the charge and rotate it to grind the ore. The Bond approach remains a classical way to estimate a ball mill’s power draw at a given percent filling and critical speed. Although the inside liner volume is required to estimate the amount of ball charge, the inside liner diameter is used to estimate power draw in Rowland’s equation. Equation 2-2, 2-3 and 2-4 show Rowland’s calculation of the relationship between power draw and mill diameter inside the liner.  8  𝒌𝑾𝒃 = 𝟒. 𝟖𝟕𝟗𝑫𝟎.𝟑(𝟑. 𝟐 − 𝟑𝑽𝒑)𝑪𝒔 (𝟏 −𝟎.𝟏𝟐𝟗−𝟏𝟎𝑪𝒔) + 𝑺𝒔      Equation 2-2 Where, 𝑺𝒔  =𝟏.𝟐𝟎𝟐(𝑩−𝟏𝟐.𝟓𝑫)𝟓𝟎.𝟖           Equation 2-3   𝒌𝑾 = 𝒌𝑾𝒃𝒙𝑽𝒑𝒙𝑳 𝒙 𝝆𝑩/𝑾𝑩          Equation 2-4 Where, kWb = kW per tonne of ball per mill length kW  = kW total mill power D = Mill diameter in meters Cs = fraction of Critical speed Vp = fraction of mill volume loaded with balls Ss = Ball size factor, Kw  per metric tonne of balls. B = Ball size in millimeters L =  Mill length 𝜌𝐵 = Bulk density of ball charge WB = Weight of balls in the mill charge 9  As per Equation 2-2, the most relevant conditions affecting mill power draw are liner inside diameter minus mill length (to calculate the fraction of mill volume Vp), percent ball loading, percent of critical speed, and mill type (overflow or grate discharge). The power of a grate discharge mill is calculated by multiplying KWb from Equation 2-2 by 1.08. This equation is also used to scale up ball mills to match a certain power requirement as described in section 2.1.1. 2.1.3 Mill Power Draw – Steve Morrell’s Approach Morrel (1996a) developed a theoretical model to determine a mill’s power based on grinding charge motion. This model was calibrated using 82 sets of operating mill data, including 43 ball mills, 31 SAG mills and 8 AG (autonomous grinding) mills. The standard deviation of the model is 5.4% for ball mills, 4.6% for SAG mills, and 5% for AG mills. The basic equations and principals of the theory are described as follows: 1. The equation to theoretically assess the power draw of a mill (SAG or Ball) is: 𝑮𝒓𝒐𝒔𝒔 𝑷𝒐𝒘𝒆𝒓 = 𝑵𝒐 𝑳𝒐𝒂𝒅 𝑷𝒐𝒘𝒆𝒓 + 𝒌 ∗ 𝑪𝒉𝒂𝒓𝒈𝒆 𝑴𝒐𝒕𝒊𝒐𝒏 𝑷𝒐𝒘𝒆𝒓       Equation 2-5 2. The correlation to empirically determine No-load Power is: 𝑵𝒐 𝑳𝒐𝒂𝒅 𝑷𝒐𝒘𝒆𝒓 = 𝟏. 𝟔𝟖[𝑫𝟐.𝟓∅(𝟎. 𝟔𝟔𝟕𝑳𝒄𝒐𝒏𝒆 + 𝑳𝑪𝒀𝑳)]𝟎.𝟖𝟐    𝒌𝑾                    Equation 2-6   3. The variation of the shoulder and toe angle is given by Equation 2-7 and 2-8 from Figure 2-1 that shows the simplified shape of the mill’s “active charge” (“C” shape) based on photographic evidence experimentally obtained by Morrell (1996). 10   𝜃𝑇 = 2.5307(1.2796 −  𝑓𝑡)(1 − 𝑒−19.42(∅𝑐−∅)) +𝜋2        Equation 2-7 𝜃𝑆 =𝜋2− (𝜃𝑇 −𝜋2) 𝑥[(0.3386 + 0.1041∅) + (1.54 − 2.5673∅)𝑓𝑡]          Equation 2-8 4. Equation 2-9 provides the power draw for the charge in the mill’s cylindrical section. It is calculated based on the total kinetic and potential energy of the charge passing through  plane ABCD of Figure 2-2. Equation 2-10 provides the kinetic and potential energy of the charge in the conical ends as it passes through the reference plane as shown in Figure 2-3. 𝑷𝒕 =𝝅𝒈𝑳𝑵𝒎𝒓𝒎𝟑(𝒓𝒎−𝒛𝒓𝒊)[𝟐𝒓𝒎𝟑 − 𝟑𝒛𝒓𝒎𝟐 + 𝒓𝒊𝟑(𝟑𝒛 − 𝟐)] 𝒙 [𝝆𝒄(𝐬𝐢𝐧 𝜽𝒔 − 𝐬𝐢𝐧 𝜽𝑻)  +𝝆𝒑(𝐬𝐢𝐧 𝜽𝑻 − 𝐬𝐢𝐧 𝜽𝑻𝑶) ] + 𝑳𝝆𝒄 [𝑵𝒎𝒓𝒎𝝅(𝒓𝒎−𝒛𝒓𝒊)]𝟑[(𝒓𝒎 − 𝒛𝒓𝒊)𝟒 − 𝒓𝒊𝟒(𝒛 − 𝟏)𝟒]       Equation 2-9  rm90o0o180o270oϴtϴsϴrmriFigure 2-1 Simplified shape of active charge for grate discharge mills 11  𝑷𝒄 =𝝅𝒈𝑵𝒎𝑳𝒅𝟑(𝒓𝒎−𝒓𝒕)[𝒓𝒎𝟒 − 𝟒𝒓𝒎𝒓𝒊𝟑 + 𝒓𝒊𝟒] 𝒙 [𝝆𝒄(𝐬𝐢𝐧 𝜽𝒔 − 𝐬𝐢𝐧 𝜽𝑻)  + 𝝆𝒑(𝐬𝐢𝐧 𝜽𝑻 − 𝐬𝐢𝐧 𝜽𝑻𝑶) ] +𝟐𝝅𝟑𝑵𝒎𝟑 𝑳𝒅𝝆𝒄𝟓(𝒓𝒎−𝒓𝒕)[𝒓𝒎𝟓 − 𝟓𝒓𝒎𝒓𝒊𝟒 + 𝟒𝒓𝒊𝟓]          Equation 2-10 Where, 𝒛 = (𝟏 − 𝒇𝒕)𝟎.𝟒𝟓𝟑𝟐 𝑘 =  Correlation factor   𝜃𝑇𝑂= Angle of the slurry pool 𝑟𝑚= mill radius at wear surface  𝐿𝑑= Length of conical section 𝑧 = Parameter     𝑟𝑡= Trunnion radius  𝜌𝑐= Charge density   𝑟𝑖= inner surface radius of charge 𝜃𝑠= Shoulder angle   𝐿= Length of Cylindrical section 𝜌𝑝= Pulp density    𝑓𝑡=  fractional mill filling 𝜃𝑇= Toe Angle     Ø= fraction of theoretical critical speed at which the mill is running ∅𝑐= fraction of theoretical critical speed at which centrifuging is fully stablished   12   Figure 2-2 Model to Estimate the Power Draw of a Ball Mill-Cylindrical Portion Figure 2-3 Model to Estimate the Power Draw of a Ball Mill-Conical Portion It is important to note that this theoretical model correlates mill internal diameter, length, percent critical speed, ball filling, and specific ore gravity . However, it does not factor in power draw as the liner lifter height and angle changes, which this thesis addresses by using a modified shoulder angle 𝜃𝑠 in Equation 2-9 and 2-10.  The modified shoulder angle was obtained from MillTraj by simulating the ball trajectory as the liner lifter wears. MillTraj software calculates the liner lifter shape (face angle, height), mill speed, and percent of mill filling to estimate the shoulder angle (departure angle) and impact angle of the outer most layer of the mill charge. LBCdrDAParticle PathhToeShoulderTrunion13  2.2 Grinding Efficiency Comparison Comparisons between ball mills have traditionally been carried out using the operating work index “Wiop”. Morrell (2008) utilized Bond’s approach to compare the efficiency of different ball mills. However, Morrell argues that this approach can only be followed if the size reduction is governed by the “third theory of comminution” (Bond, 1952) represented by Equation 2-1. If the specific energy of a mill is higher than the calculated “W” of Equation 2-1, then the mill is not operating efficiently.  Grinding operations use the operating work index “OWi or Wop” of Equation 2-11: 𝑶𝑾𝒊 =𝑾𝟏𝟎(𝟏√𝑷−𝟏√𝑭)      Equation 2-11 This operating work index can compare circuits with different feed and product sizes, so long as ore hardness variability is low enough to not impact the OWi significantly. This equation can also compare different types of ores using the ratio between laboratory and operating work indexes. As mentioned, in this thesis the OWi is used to determine the efficiency of a ball mill during the service life of its liners. 2.3 Mill Liners Ball mill liners are used to protect a mill’s shell interior from wearing due to the impact and abrasion action of steel balls. The three ball mill liner types, based on the material of construction, evaluated in this thesis are rubber, wave steel, and metallic magnetic. Which liner is installed in ball mills varies according to production targets and operator experience with different liner types.  14  Based on the liner shape, Powell (2006) describes seven types of liners used in SAG or ball mills: 1. Solid liners are fabricated as an integral piece plus lifter with fewer pieces per mill shell. 2. Removable lifter liners have more pieces, but are easier to change out for maintenance. 3. Grid liners are shaped like a pocket so that they become part of the liner structure. 4. Wedge liners or key liners are used when bolts are not desired. However, they are no longer used due to safety during their installation. 5. Integral wave blocks are fabricated to maintain the liner profile along its service life. 6. Uni-direction liners have different face and rear angles, and cannot be run in two directions. 7. High-Low double wave liners provide a consistent wear profile along their service life. In general, steel liners are conventional liners that have been traditionally used in the mining industry for many years (Powell, 1991A). Ore type and mill operation allow steel liners a longer service life at higher throughput compared to rubber liners. However, steel liners have been replaced by rubber liners for several reasons. Their weight makes steel liners difficult to install and special tools are required. Rubber liners have the advantage of being lightweight and have a longer service life (Powell, 1991A). However, they take up more volume inside a mill and thus reduce throughput until they start to wear out. Even so, some mill operators still prefer the lightweight versatility and relatively longer life of rubber liners, and willingly accept lower throughput until the liner wears down and more balls can be added to the mill.  15  Of the three, magnetic liners have the longest service life and are thinner than either rubber or steel liners. Iron and copper mines take advantage of the magnetic liners when the ore contains ferromagnetic material that forms a protective layer on the magnetic liner surface that extends its service life even further, in some cases to more than 6 years (HMR Technology Canada, product technical information on magnetic liners performance). Magnetic liners notably do not wear out progressively like rubber and steel liners, so the power draw of a mill fitted with a metallic magnetic liner will remain constant during the liner’s service life.  Differences in liner types and uses have necessitated research to explain the impact of mill liner profiles on throughput and grinding efficiency. Historically, previous attempts to explain these differences date back to Meaders and MacPherson’s (1964) foundational research on efficient operating conditions for speed and liner lifter configuration. Their study evaluated the effects of lifter liner height-spacing and speed-lifter height on an autogenous mill’s performance. The parameters considered included the shell’s lifter bar height and spacing, the product discharge method, mill length, and mill speed. The effects of height-to-spacing of mill lifters is shown in Figure 2-4 (Meaders and MacPherson, 1964). Note the maximum capacity area relative to the spacing/lifter height ratio which reflects the effect of the lifter height on mill throughput. Futhermore, Meaders and MacPherson compared different types of liner lifters and determined that at certain mill speeds the power utilization of a mill without liner lifters is very poor. The three types of liners compared had smooth, low and normal lifters. Smooth liners have no lifter and require 40kW per tonne (kW/t) of ore whereas normal liners (with lifters) require 15kW/t.  16   The authors then suggested varying mill speeds according to the lifter’s carrying capacity. Smooth liners required 92% of critical speed whereas normal liners operated best at 72-80% of critical speed. The authors concluded that 72-80% of critical speed was optimum for lifters to achieve the highest mill power utilization (grinding efficiency). The effect of liner type on power draw for the different liner lifters studied is shown on Table 2-1. Table 2-1 Power effect of Lifters  Type of Lifter kW per Ton Smooth 40 Low 20 Normal 15 Figure 2-4 Effect of Spacing/height of mill lifters (mill speed 25.5 rpm) 17  Since then, several researchers have sought to find maximum mill efficiency. Among these are McIvor’s (1983) work on the effects of speed and liner configuration on ball mill performance. He determined that ball trajectory is highly sensitive to the mill’s liner lifter angle from a 90o to 60o vertical position (measured from the horizontal plane). He concluded that the liner lifter’s angle and liner configuration may significantly affect ball mill performance. McIvor (1983) also found that the understanding of liner wear rates is important for an overall analysis of mill performance.  Later, Moller and Brough (1989) further described the relationship between the height-spacing of rubber liners and mill efficiency. Their conclusions were based on observations in several mills where rubber liners were installed. Although no plant data were provided, the authors described several factors affecting mill liner service life and performance in terms of product size and efficiency, some of them are: 1. The relationship among lifter height, spacing, and critical speed (Figure 2-5) expressed as: 𝑩 = 𝑨(𝟏 −𝑵𝟏𝟎𝟎)                  Equation 2-12  Where, A = Lifter spacing B = Lifter height N = Percent of critical speed 18   2. Lifter face angle 3. Ball Trajectory and Lifter profile 4. Effect of liner thickness on mill capacity 5. Effect of the liner configuration on the product grind size Figure 2-6 shows the experimental results that Moller and Brough (1989) obtained when using different types of liner lifter shapes and heights. Lifter shape 1 (short height) produces a low shoulder angle and lifter shape 2 (tall with vertical angle) produces a high shoulder angle. These results show the liner shape impacts the shoulder angle and thus the mill power draw.Meaders and MacPherson’s (1964), McIvor’s (1983), and Moller and Brough’s (1989) core studies indicated that shoulder angles might factor in as a parameter for estimating mill power draw. It is interesting to note that Moller and Brough’s (1989) work addressed several issues and relationships between mill performance and liner configuration relevant to this thesis. In particular, their results indicate that liner shape affects the shoulder angle and thus the mill power draw. Together, the collective findings represented in these core research studies suggest that Figure 2-5 Relationship among Lifter height, distance and speed (Moller and Brough, 1989) A B 19  changes in lifting capacity or liner face angle fundamentally require different mill speeds to increase efficiency. 2.4 Modelling the Influence of Liner Profile on Ball mill Performance  After 1989, research published on the influence of liners on mill performance flourished. Most researchers used Discreet Element Method (DEM) simulation to study mill throughput changes along the service life of the mill liner and backed their models with laboratory data. Notable among these are Powell and Vermeulen’s (1994) findings, which contradicted Fuersteanu and Abouzeid’s (1985) proposal that the energy required for grinding is not affected by the lifter size of the grinding mill.  Cleary, Morrisson and Morrell (2003) carried out a DEM and scale Model Figure 2-6 Ball Trajectories for 50 mm balls in a 5 m diameter mill at 75% of critical speed  1 2 3 4 54522520321468230o3456o1234520  Comparison of a SAG mill’s flow patterns. Shoulder, toe and vortex data were assessed. Their findings indicated that both DEM power predictions and Morrell power equations (Morrell, 1996a,b) were sensitive to ball mill No-load Power (power draw when the mill is empty with no balls and only liners). Morrell’s predictions proved to be significantly more accurate than the single run experimental data, and the authors recommended they be provided as a guide to DEM power trends.  Today, the influence of liner wear on mill performance, throughput, power and product size can be quantified using Planta data, JKSimMet® (metallurgical simulator), and MillMapper (3D scanning of the mill liner profile) (Toor, 2013). Morell’s power model (Model C) does not correlate well with real mill power draw along the service life of the liner due to the fact “that the actual power decreases due to the reduction of lift and cataracting charge whilst the Morrell power model shows power increases as the mill diameter increases” (Toor, 2013). Toor (2013) found difficulties when trying to use JKSimMet® to estimate the mill power draw as well because the simulator is not sensitive to changes in mill lifter shape other than changes in mill volume. Toor found that  the mill lifter and plate reduction in height to wear ratio is linear. He also demonstrated that the maximum lifter face angle after half service life varies between 40 to 30 degrees when maximum throughput is achieved. Experimental research on liner profiles indicates the milling rate of modified liners increases when compared to worn out liners (Makokha & Moys 2006). Makokha and Moys (2006) used a lab scale ball mill to assess the lifter profile’s influence on milling rate and fines production. They concluded that it is possible to maintain mill capacity by optimizing liner design. Additional research on laboratory ball mills found that mill power is affected by the number of 21  lifters, lifter height, mill charge, and mill speed (Rezaeizadeh, Fooladi, Powell and Mansouri, 2010). This study concluded that, as the liner lifters wears, grinding action can be maintained by increasing the speed in variable speed mills. Of special interest, a study of the influence of liner wear on mill capacity demonstrated with real data and modelling that mill capacity decreases as the liner wears (Kalala et al. 2008).  Newer research indicates that frequently changing liners maintains an optimum profile that economically outperforms extending the life of a less efficient liner lifter profile after it wears out (Toor et al. 2011). Worn liners produce higher rates of fines in SAG mills (Toor et al. 2011). In contrast, research on changing liner lifter profiles in a 1.0m diameter x 0.5m long batch mill on grinding performance shows that ball trajectory leads to more effective grinding (Usman et al., 2017). Similarly, a study of a 32’ SAG mill (Toor et al, 2013) combining plant data and simulations showed that wear accelerates towards the end of a liner’s service life, and the resulting changes in mill diameter allow for higher throughput. Because throughput and power increase considerably as the liner wears (by the middle of the service life), it is reasonable to affirm that a shorter liner service life design has an overall operational and economical benefit compared to a standard longer service life design.  Finally, Franke and Toor (2011a) explained that mill filling (the fraction of total mill volume occupied by balls and ore) is not monitored by operators but the total mill load, which gives a wrong indication of the charge volume since mill volume also increases as liners wear. Mill operators typically use power draw as a control parameter based on the assumption that a higher power equates to a higher throughput (Franke and Toor, 2011a). However, research on grind curves shows maximum power does not always lead to higher throughput (Powell et. al, 2009). 22  Total mill load as a mill control parameter  (total mill load indirectly indicates total mill power) is a misleading metric because the mill loses weight as the liner wears out. Mill volume does increase, but the mill’s load cells will not show an appreciable change in weight. Thus, for optimal control mill load must be calibrated to account for liner mass loss (Franke and Toor, 2011a). Franke and Toor (2011) proposed a technique to quantify the effect of liner shape on mill efficiency by designing a liner that maintains an optimum shape for most of its service life. However, it does not consider that the fundamental consequence of changes to the liner’s shape is a change in ball charge trajectory and thus shoulder angle. In other words, if the ball charge trajectory can be maintained by liner design and mill speed, then operators can maintain a high mill efficiency regardless of the liner type.  2.5 DEM Software Limitations The Discrete Element Method (DEM) is a numerical method used to compute the motion and collision of a large number of particles (Cundall & Strack, 1979). DEM permits the calculation of particle trajectories within liners and lifters of a mill as it rotates. The fundamental laws of motion, and particle geometry, dimensions, and material properties are considered in the calculation. DEM has been used for modelling particles inside of ball mills since its introduction in 1979. However, the technique is computationally intensive and limits the length of simulations and the number of particles that can be used in the model (Weerasekara et al., 2013). Computational effort increases dramatically when the breakage of millions of particles is incorporated into a DEM model, and could be impractical with available computer hardware (Weerasekara, Liu and Powell, 2016). 23  Toor (2013) describes the following disadvantages when using DEM modelling: ● It takes over a week to carry out computations for 3D modelling particle size distribution. ● Most DEM codes do not include breakage and fluid-particle interactions in a ball mill.  ● DEM modelling time and costs are much more than JKSimMet® or MillTraj® software. The conclusions of additional studies are in line with these experimental results (Toor, 2013). When the lifter height is too low the mill’s work efficiency decreases, at which point the DEM mill power draw estimate is more accurate and consistent than existing empirical formulas of power draw estimates because these formulas do not consider the effect of the lifters (Bian et al., 2017). Thus, although DEM software has been used in the comminution field, it was not selected for use in this study due to its computational and hardware limitations. 2.6 MillTraj® Software MillTraj® is a simulation software that uses a model to predict the motion of the outermost layer of grinding media based on the liner profile dimensions, mill dimensions, charge filling, ore size and mill speed. The software indicates the charge’s toe position or highest point. The software also advises the optimum spacing to height (S/H) of the liner ratio or “S/H Ratio” which will only be achieved after the liner wears and passes through its optimum S/H point. The software license used in this thesis is for academic use only and does not have the option to add a different liner profile other than to a minimum 30 degrees lifter face angle. Powell (1991) conducted a theoretical study of the effect of different lifting bar heights and face angles on the trajectory of the outer layer of balls of the mill charge, which is the conceptual 24  basis of MillTraj software. The study, based on the fundamental laws of motion, analyses the forces on a ball in contact with a lifter bar when a mill is rotating and describes its motion as an isolated bar or ball. Figure 2.7 shows the forces on the ball of mass “m” in a mill of an internal radius “R” rotating an angular velocity Ω when it is lifted by a “lifter” of face angle “r”. Where, Ø = Angle subtended by “r” and “x” axis Ω = Angular velocity of the mill β = Angle between the radius vector to ball and face of the lifter bar Figure 2-7 Forces on a ball in contact with a lifter bar (Powell, 1991) 25  α = Angle between lifter bar face and a radial line that passes through the tip of the lifter bar µ = coefficient of friction (s: static, k: kinetic) F = resultant force on the ball, parallel F = resultant force on the ball, perpendicular m = mass of ball g=Angle subtended by “s” and “x” axis r= Lifter face angle g = gravitational acceleration  Figure 2-8 Parabolic trajectory of a ball at its point of departure from lifter bar (Powell, 1991) 26  Powell also analyzed the forces on the ball/rod when it rolls down the lifter face (pure rolling) and the forces on the ball/rod when it slides along the lifter bar face. Once the ball has reached the end of the lifter bar (tip of lifter bar), the ball is pushed into a free flight and its impact position is determined by XE and YE as shown on Figure 2.8.  An experimental program was designed by Powell (1991) to plot the ‘rod’ trajectories in a rotary mill to compare its theoretical model with actual rod trajectories. Powell used ‘rods’ instead of balls in a 387 mm diameter x 300 mm length glass-ended drum to avoid the additional lifting action and distorting effect of end plates have on balls. Also, when balls are used in this experiment, the balls tend to migrate away from the drum ends which does not happen when rods are used. Powell used a high-speed camera to film the rod trajectory inside the drum. The drum was fitted with a variable speed gear box and removable lifter bars with variable heights and angles. Powell’s theoretical model uses the fundamental laws of physics; thus, it can be applied to a mill of any size.  The theoretical study and the experimental results show that the model correctly predicts charge motion. Powell concluded that trajectories, departure angle (shoulder angle) and impact angle are independent of mill size. Powell’s experiment showed that energy is wasted by increased liner wear and inefficient charge motion when smooth liners are used. On the other hand, increasing the lifter bar face angle resulted in increased grinding element lift and impact angle. 27  2.7 Theories of Influence Summary In summary, Bond’s third theory of comminution-JKSimMet® and Morrell’s Model C (Morrel, 1996), are necessary to estimate the energy required for ore size reduction and mill power requirements respectively. Morrell (2004a) found that the operating work index is also a useful tool to compare the efficiency of grinding circuits. Meaders and MacPherson (1964) studied the impact of liner shape and spacing, and found that there is an optimum point of efficiency within a certain lifter height and spacing, and at a certain mill speed. Moller and Brough (1989) obtained a useful relationship between liner lifter height, spacing and mill speed that is still used. Makokha and Moys (2006) assessed the influence of the lifter profile on milling rate and fines production and concluded that it is possible to maintain mill capacity by optimizing liner design. Furthermore, as the mill liner lifters wear there is a decrease in grinding action that can be compensated for by increasing mill speed and changing the liner lifter shape (Usman et al., 2017).  The mill liner profile’s influence on mill performance, throughput, power and product size, can be quantified using 3D scans of the mill liner, survey data and JKSimMet®  modelling (Toor, 2013).  The relationship between the liner lifter face angle, mill power draw and mill throughput, has been the subject of this literature review. While it is clear that a mill’s liner lifter affects its power draw, there is no quantitative proof of this relationship in the literature. Furthermore, it is clear from the literature review that it is not possible to simulate the impact of liner wear on mill performance using either JKSimMet® or Model C since Morrell’s Model C (1996a) does not consider the effect of the liner profile, specifically the lifter face angle, in the equation to 28  estimate the mill’s power draw. Because Model C predicts the power draw of the mill without considering the liner lifter shape, as the liners wear Model C becomes insensitive to the shell lifter face angle changes and returns increasing values of power draw as the internal mill diameter increases, which in practice does not happen. In actuality, the mill power draw decreases towards the end of the service life or when the lifter face angles decrease below approximately 40o from the horizontal. Therefore, adding a corrected shoulder angle, as this thesis proposes, compensates for Morell’s Model C inaccuracy and provides a better assessment method for estimating mill throughput.   29  Chapter 3: Methodology This chapter describes the data gathered from operating plants, the software used for analyzing the plant data, and the correlations used to predict mill power draw under different conditions. As mentioned, the purpose of this thesis is analyze factors affecting mill power draw when using each of the three most widely used ball mill liners in order to demonstrate that changes in liner lifter face angle resulting from wear has a larger impact on throughput than liner type does. The hypothesis is that the shape of the lifters drives mill grinding efficiency and throughput independently of the type of liner used in the ball mill. The analysis of mill operating data collected during several years using the Morrell’s Model C and MillTraj® simulation software is used to test this hypothesis.  As discussed, Morrell’s (1996) Model C is based on the motion of the grinding charge and is equally applicable to ball, AG and SAG mills. However, the shoulder angle of the charge is overestimated in this model when the mill liner is worn. Thus, it was replaced by a new shoulder angle obtained from a ball trajectory simulation using MillTraj® software. Because MillTraj is based on the fundamental laws of motion (Powell, 1996) it can be used in any mill size. A full set of a ball mill operating/production data and liner wear reports were used to carry out the simulations. Results from the analysis conclude that the operating work index is a good indicator of mill efficiency. This conclusion was tested using a SAG mill operating/production dataset along the mill liner’s service life.  Plant data for two ball mills at 7.3m diameter x 12.2m length, producing 35,000 tonnes of ore per day from January 2014 to May 2017, were collected. Plant data from one SAG mill at 12.2m 30  diameter x 6.7m length, and one ball mill at 7.9m diameter x 12.2m length, producing 70,000 tonnes of ore per day from January 2016 to December 2017, were also collected. The ball mill plant data were used to find power draw trends and operating work index during liner service life cycles. The ball mill data were gathered from the mill information system that contains the mill operating parameters.   The profiles of mill liner along its service life were obtained from mill maintenance reports from the same operating plants as the data collection. Preliminary information provided from several small plants in Mexico and South America showed the first indications of a relationship between mill grinding efficiency and the lifter angle of the ball mill. Unexplained changes in the operating work index of a Mexican plant suggested a correlation between the lifter face angle and the mill’s power draw as product grind size increased. The liner service life profile was provided by the operating plant and was used to determine the typical face angle and height of the lifter at half  and at the end of its service life. In some cases, the plant data were not complete and a final end of life face angle was assumed at 30o. The face angles of liner lifters were measured manually and compared to the length of service life. It was noted that the lifter face angle is between 50-60 degrees at about half of the liner service life and between 30 - 45 degrees at the end of the service life. Ball mill data and ore information were provided by operations in South and North American mines. 31  3.1 Measurements Grinding circuit operational data from one SAG mill and two ball mills (Appendix 5 - Plant 1) were gathered for the years 2014 to 2017 from the plant information system of a copper mine in North America. The ball mill rubber liner’s service life was between 10 and 12 months. Another set of SAG and ball mill operating data (Appendix 5 - Plant 2) from between 2016 and 2017 were gathered from a copper mine in South America. The service life of the SAG mill liner was between 5 to 6 months. The SAG and ball mill liner type was steel in both cases. The SAG mill data included service life, tonnage, operating hours, mill power draw, F80, P80, mill speed, and critical impacts (ball impacts considered outside the safe impact area in the monitoring noise software) on the liner.  The ball mill data of plant 1 included mill power draw, tonnage, feed size, power draw, operating hours, mill product size, liner wear profile and basic mill design data such as installed power, ore specific gravity, mill design speed, and design %ball charge. The ball mill’s power data was analyzed using Morrel’s Model C to see the correlation between estimated and actual power drawn by the mill. Also, the ball mill’s historical power data was analyzed during periods, from the day a liner is replaced until the day is worn out and replaced again (within liner changes). Liner wear reports included liner face angles that were measured manually to obtain an average angle at half the service life and end of the service life. The liner shapes and measurements were also obtained from the liner wear reports available in the Copper Mountain Mine internal liner wear report 2016-2017 (UBC Variable Speed Ball Mill Motor Project Database). The purpose was to obtain an average lifter face angle at approximately half and at the end of the lifter service 32  life. Figure 3-1 shows the wear of one lifter liner within one year of its service life (curves inside the square). The red lines drawn on the figure are references to measure the lifter face angle. At about 6 months of service life, the face angle is approximately 55o (Ø1) and at the end of the service life is about 40o (Ø2). Figure 3-1 Measurement of liner lifter angles 3.2 Calculations The mill operating work indices were calculated assuming that, during the time period of the evaluation, the ore work index was constant. The SAG mill transfer size of Plant 1, T80, was assumed to be constant at 5,000 microns for the year 2014 and 6,000 microns for the year 2015 Ø1  Ø2 33  according to plant information from spot samples and 2,500 microns for the SAG mill of Plant 2. The ball mill P80 was obtained from plant data as an average per operating day. The range of error of this assumption can be calculated using Bond’s equation:      𝑾 = 𝑾𝒊 (𝟏𝟎√𝑷−𝟏𝟎√𝑭)     Equation 3-1 When replacing the values of P (P80) = 250 microns and F(F80) =4,000, 5,000 and 6,000 microns, the calculated energy “W” will vary in the following proportions from the mean average of 5,000 microns: F(F80) =4,000, Error : -4% F(F80)= 5,000 Average F(F80)= 6,000, Error: +2% The March to December 2014 data from Plant 1 show a clear trend in the operating work index (Wio) since the liners were all changed out during that time period. Between March 2014 and May 2016, the liners were only partially changed. The discharged end liners were changed first, followed by the front liners, which is shown in the up and down data trends. However, the May 2016 to March 2017 data also show a clear trend of the calculated indices Wio since the liners were all changed out. Model C was used to estimate the power of the ball mill using shoulder angles obtained from MillTraj®. The ball mill basic data was input into the MillTraj® software and a liner profile was 34  built based on the mill’s liner information taking into account the face angles from mill maintenance reports. As indicated in the MillTraj® software manual, the lifter face angles and height can be used in MillTraj instead of detail liner profiles since these angles play a major role in the ball trajectory. The liner profile at half and end of service life was assumed but the face lifter angles were obtained from the plant data averages. The liner’s height as it wears was also obtained from plant data reports. The new shoulder angles and Model C were then used to estimate the mill power draw. These showed a better correlation between the estimated and actual value. The mill power draw obtained using the corrected shoulder angle helps explain why Model C differs from power draw estimates when a plant survey is carried out at a certain point in the liner’s service life and the power draw calculated when the liner lifters are worn out. The calculated Wio and operating days were plotted on a graph (Figure 5-10) to show the relationship between service life and grinding efficiency. Mill data and liner information were used in MillTraj® to simulate the effect of increasing the mill speed from 75% to 85% critical speed. The SAG mill’s data of plant 2 were also plotted (Figures 5-11 and 5-12) to observe the behavior of the Wio along the liner service life. Also, the ore feed Bond Work Index(Wi) (Figure 5-13) shows a range of values between 9 and 15 kWh/t. However, this range of Wi values does not affect the overall operating work index trend which increases as the liner wears (Figures 5-11 and 5-12). The ball trajectory of  the SAG mill of plant 2 was not simulated due to the lack of liner profile information.   35  Chapter 4: Comparing Ball Charge when Using Different Type of Liners The ball charge or total ball tonnes inside a ball mill is usually controlled and reported as a percentage of the mill volume inside the liners. Thus, it is necessary to first determine the mill volume based on the type of liner and then determine the power that a ball mill can draw. The power draw is needed for calculating the specific energy consumption or kWh/t of ore. The lower the specific energy, the more efficient the utilization of energy in a grinding unit operation. This chapter contains the power calculations related to the mill diameter using the Bond’s approach and Morrell’s Model C. The ball charge in the ball mill is driven by the available volume of the ball mill after installing the liner to protect the mill shell from wear and ball impact. Although the ball charge (weight) is simply calculated based on mill volume, the importance of its calculation relies on the amount of power a mill can draw due to its ball charge and therefore its throughput. Thus, the thickness of the ball mill liner needs to be related not only to the mill volume but also to the power that mill can draw during the mill liner service life. 4.1 Mill Volume Inside Liners Mill volume needs to be calculated to estimate the amount of balls that can be charged into the ball mill. From simple geometry, mill volume decreases as the diameter inside the liner decreases, or in other words, the thicker the liner the smaller the mill volume. The typical thickness for steel liners is 2 x 91.5 mm (0.6 feet), while for rubber liners it is 2x110 mm (0.72 feet) and for magnetic liners it is 2x86 mm (0.56 feet), including the dynamic protective layer of scats attached to the magnetic liner’s surface. Figure 4-1 shows a typical wave 36  steel liner and Figure 4-2 shows a rubber liner plate/lifter. Figure 4-3 shows the final installation of a metallic magnetic liner and Figure 4-4 shows several pictures of one unit of metallic magnetic liner enclosed in a plastic box showing the shape and height of the magnetic field using fine iron.  Figure 4-1 Rubber Liner (Moller and Brough,1989) Figure 4-2 Steel Liner 37  Figure 4-3 Metallic Magnetic Liner (HMR Technology Canada) Figure 4-4 Magnetic Field shape and height of a Metallic Magnetic Liner Magnetic Liner   38  4.2 Weight of the grinding media (steel balls) inside the Ball Mill The grinding media weight can be calculated by multiplying the ball mill volume inside liners by the percentage of the volume occupied by the balls by the bulk density of the balls used as per Equation 4-1: Weight of balls = %Volume loading x Mill volume inside liners x Ball bulk density/100   Equation 4-1 The bulk density of forged balls is assumed to be 4,646-4,800 kg/m3 (290 -300 lb/ft3) and 4,165 kg/m3 for cast iron balls. 4.3 Ball Mill Power Draw Due to the Ball Charge 4.3.1 Bond Approach Bond’s equation (Rowland, 2002),show in Equation 2-2 does not take into account the cone ends of the mill or the buoyancy effect in overflow mills. This equation has been very accurate for ball mills but not for SAG mills with end cones. 4.3.2 Morrell Approach (Morrell, 1996) The equations and principals of the Model C theory used to assess the power draw of SAG and Ball Mills is based on Equation 2-3. This equation takes into account the mill end cones and the buoyancy of the balls in an overflow mill, but it does not consider changes to the shoulder angle when the liner lifter’s face angle changes as it wears. Table 4-1 shows the power draw when using the Model C and when using also the Model C but with shoulder angles obtained from MillTraj®. Model C predicts increasing power draw as the liner wears. However, when the 39  shoulder angles obtained from MillTraj® are replaced in the Model C equation, the power draw increases and then decreases towards the end of the service life of the mill liner, which is observed in real mill operations. 4.4 Comparison of Ball Charge and Power draw when using different type of Liners The internal volume of a mill depends on the average thickness of the liner since the mill cylinder’s internal diameter is directly affected by liner thickness. The thinner the liner, the bigger the internal mill volume and thus the mill grinding capacity. Table 4-2 shows the calculated power draw, using Bond’s equation, when a rubber liner is used in a 4.5mD x 6.0mL ball mill. The rubber liner’s average thickness is estimated to be 0.3 m (1.0 ft.). The average thickness of a steel liner is 0.18m (0.6ft.) and that of a magnetic liner is 0.172m (0.56ft). Figure 4-5 shows the power draw of the ball mill versus the liner thickness. The arrows show the power draw for the three different types of liners. However, it is important to highlight that the power draw will increase as the rubber liner and steel liner wear whereas the power draw of a mill fitted with a metallic magnetic liner will remain constant during the service life of the liner. 40  Table 4-1  (A) Mill Power Draw  Using MillTraj angles and (B) Using the Model “C” MODEL "C" FOR MILL POWER - RUBBER LIINERSCopper Mine in North AmericaMill Internal Diameter Inside LinersCylindrical Length inside liners(Belly length)Fraction of Theoretical Critical SpeedCenter Line LentgthOre DensityBall densityBall Fractional mill fillingTotal Mill Filling Fraction%Vol solids in slurry, fractionShoulder AngleToe AngleNo-Load PowerPower Draw due to motion of ChargePower draw of Cone End  Charge MotionGross PowerUSING MILLTRAJ ANGLESDi L φ ρₒ ρB Fb Ft ρp ϴs ϴt P Pt Pc Pptm m % m Degrees Degrees kW kW kW kWNew Liners 7.075 11.616 0.750 13.361 2.77 7.8 0.270 0.270 0.4574 71 236 570 9226 269 125336 months worn Liner 7.195 11.746 0.750 13.491 2.77 7.8 0.270 0.270 0.4574 47 236 595 9559 314 130341 year Worn Liners 7.235 11.806 0.750 13.551 2.77 7.8 0.270 0.270 0.4574 25 236 604 8935 335 12285MODEL "C" FOR MILL POWER - RUBBER LINERSCopper Mine in North AmericaMill Internal Diameter Inside LinersCylindrical Length inside liners(Belly length)Fraction of Theoretical Critical SpeedCenter Line LentgthOre DensityBall densityBall Fractional mill fillingTotal Mill Filling Fraction%Vol solids in slurry, fractionShoulder AngleToe AngleNo-Load PowerPower Draw due to motion of ChargePower draw of Cone End  Charge MotionGross PowerModel "C" Di L φ ρₒ ρB Fb Ft ρp ϴs ϴt P Pt Pc Pptm m % m Degrees Degrees kW kW kW kWEGLNo Liners 24'x 39.5'EGL 7.315 11.886 0.750 13.631 2.77 7.8 0.32 0.32 0.4574 49 229 621 11169 403 15202Progressive Liner WearNew Liners 7.075 11.616 0.750 13.361 2.77 7.8 0.270 0.270 0.4574 44 236 570 9004 304 122976 months worn Liner 7.195 11.746 0.750 13.491 2.77 7.8 0.270 0.270 0.4574 44 236 595 9495 317 129581 year Worn Liners 7.235 11.806 0.750 13.551 2.77 7.8 0.270 0.270 0.4574 44 236 604 9677 321 13202A B 41   Table 4-2 Power Draw by a 4.5mD x 6.0mL Ball mill  Figure 4-5 Liner Thickness Vs. Power Draw Parameter Description Value Units Value Units Mill Dimensions         Diameter 14.76 ft 4.5 m Length 19.69 ft 6.0 m Mill Diameter Inside Liners 13.71 ft 4.2 m Length Inside Liners 18.64 ft 5.7 m Liners 1.05 ft 0.3 m Volume Inside Mill 2752 ft³     Percent Volume Loading of Balls 45 %     Ball Loading 185.74 s.t. 168.47 t Percent of Mill Critical Speed 78 %     Mill Speed, rpm 16.14       Bulk Density of Ball Charge 300 lb/ft³     Makeup Ball Size 2.4 in     Ball Size Factor 0.15       Kilowatts per ton Balls 9.54       Mill Power Draw 2376 HP  1772  kW Magnetic/steel Liner Rubber Liner 42  4.5 Impact of Weight of Different Types of Liners on Power draw No Load Power The power that a ball mill’s motor draws when the mill is empty is defined as “no load power” (Morrel, 1996) and it is calculated using Equation 2-6. It is very rare to find no-load power measurements since the mill needs to run empty which happen only during commissioning or mill maintenance.  The mill’s no-load power when using rubber liners is 66.67% of that when using steel liners. The relationship is: No Load Power (Rubber) / No Load Power(Steel) = 66.67%      Equation 4-2 This relationship was obtained assuming that the rubber liner’s weight is 1/3 of the steel liner’s weight, the shell weight is approximately the same as the steel liner weight, and that the inside liner diameter for rubber and steel liners is almost equivalent. The equations used are: No Load Power  =  Torque x angular velocity      Equation 4-3 Torque   =  weight x radius of gyration      Equation 4-4 No load power with new steel liners is 263 kW and was calculated using Morrel’s empirical Equation 2-6 (Morrel, 1996). Therefore, the mill’s no load power when using rubber liners is estimated at 175kW (66.67% of the 263 kW), which implies a power reduction of 88kW at 73% critical speed when rubber liners are used instead of steel liners. 43  Total Power Draw (Power Draw) Mill power draw changes in direct proportion to its length, ball loading and rotating speed. In a fixed speed ball mill, operators can only change the ball loading which is a percentage of the mill internal volume. At the same time, mill volume is affected by the liner thickness. In other words, a thicker liner reduces the mill volume and the number of grinding balls, thereby reducing power draw and throughput. For example, a 5.182m D x 10.363m L ball mill with a rubber liner has an equivalent liner thickness of 95 mm (0.31ft) that translates into a ball mill internal diameter of 4.992m (16.38 ft), which is close to that of a standard steel liner internal diameter of 4.999m (16.40 ft). A magnetic liner has an average equivalent thickness of 73mm (0.24 ft). At 73% critical speed and 43.5% ball loading, the power draw (calculated using Equation 2-4) for new rubber liners is 4,124 kW (5,530 HP). For new steel liners it is 4,208 kW (5,643 HP), and for magnetic liners is 4,292 (5,755 HP). 4.6 Impact of different type of Liners on Power draw Table 4-3 and Table 4-4 show the power draw of a 7.315m D x11.886 m L ball mill when using different types of liners. Table 4-3 and Figure 4-6 show that when the liners are new, the steel liner draws more power than the rubber liner since the rubber liner is the thicker of the two. Thus, mill internal volume is reduced and contains fewer ball tonnes. However, as the liners wear mill internal volume increases and the rubber liner draws more power than the steel liner does. At the same time, the rubber liner shoulder angle decreases at a slower pace than that of the steel shoulder angle. Therefore, the rubber liner draws more power than the steel liner as the liner wears due to the combined effect of increasing volume and slowly decreasing shoulder angle.  44  Table 4-3 Mill Power Draw when Using Different type of Liners – Rubber and Steel    Table 4-4 shows the magnetic liner power draw at maximum and minimum shoulder angle obtained from Milltraj simulations assuming the highest and lowest possible liner lifter face angle.  Table 4-4 Mill Power Draw when Using Different type of Liners – Magnetic Liner    The magnetic liner has more than a two-year service life in copper and iron mines and its thickness is approximately constant. Power draw is in the medium-low range due to its low profile (liner lifter angle). The magnetic liner lifter angle is difficult so simulate since it has a protective layer of ferromagnetic material and broken balls. The magnetic liner profile is given by the magnetic field wave shape and the difference in height of the liner units, plate and lifter, to form a lifter  Rubber Steel Service Life  Shoulder Angle Gross Power Shoulder Angle Gross Power   Degrees kW Degrees kW New Liners 71 12,533 47 12,706 6 Months  47 13,034 23 12,144 12 Months 25 12,285 5 11,074  Magnetic  Liner Service Life Shoulder   Angle-Assumed Gross Power  Degrees kW Maximum Lift 49 12,764 Average Lift 30 12,074 Minimum Lift 6 10,496 45  like profile. In summary, mill tonnage is driven by power draw, and power draw is driven by liner thickness and liner lifter face angle. In turn, the liner lifter face angle and mill speed determine the shoulder angle. MillTraj was used to simulate the mill conditions and liner profile to estimate the shoulder angle at different times along the service life of the liner. Figure 4-7 shows that the rubber liner has the steepest shoulder angle and the steel and magnetic liner show similar low shoulder angles.     Figure 4-6 Power Draw Comparison of Different Type of Liner at 75% Critical Speed 46   Figure 4-7 Shoulder Angle Comparison of Different Type of Liners 47  Chapter 5: Assessment of Ball Mill Speed for Different Types of Liners In Chapter 4, mill throughput and power draw were evaluated as a function of mill volume and ball charge (% volume - ball loading) at 75% mill critical speed.  Although most ball mills have fixed speed drives, mill speed plays a key role in mill throughput and grinding efficiency. This chapter describes the effect of mill speed on power draw and ball trajectory by using simulation software and Morrell’s Model C. The mill speed is operationally restricted to protect the liner from being directly impacted by flying balls if the mill speed is too high. This limitation and the fact that the ball trajectory can be modified by changing the mill speed leads to the conclusion that there is an optimum mill speed. Ball mill speed is usually referred to as a percentage of critical speed. Critical speed is defined as the mill rotational speed at which the mill charge centrifuges and thus the power draw drops drastically. Ball mills must be operated at a lower speed than the critical speed for grinding to take place by cascading or catarating. At low rotational mill speed, less than 70% of critical speed, the ball mill charge has a cascading grinding action and at high rotational speed, at 70-85% of critical speed the ball mill charge has a catarating grinding action. Ball mill speed impacts two key aspects of the milling process: 1. Power draw: throughput and ball consumption  2. Ball Trajectory: mill grinding efficiency and liner wear 5.1 Power Draw The mill power draw is driven by the ball charge and its rotational speed as described in section 48  4.3. These two parameters were used to calculate the power draw using Morrell’s Model C equation at a mill liner thickness of 0.27m (pocket/grid steel liner) for a 4.5m x 5.0m ball mill. Figure 5-1 shows that a ball mill cannot be run at higher speeds than 90% without losing power and thus throughput. However, it is necessary to consider that the mill internal diameter increases as the mill liner wears and therefore the critical speed “vc” decreases as shown in Equation 5-1 (Gupta & Yan, 2006) where “D” is the diameter of mill inside liners in meters and “d” is the diameter of the grinding ball which is usually neglected in practical calculations. 𝑽𝒄 =𝟒𝟐.𝟑√(𝑫−𝒅)          Equation 5-1 Figure 5-1 shows the mill power draw of a 4.5m x 5.0m ball mill when the fraction of theoretical critical speed changes from 70% to 100%. Figure 5-1 was obtained by plotting the results of Table 5-1. Details of the calculations are shown in Appendix 1.  The shoulder and toe angle location as defined in the model C are shown in Figure 5-2. Figure 5-3 is a plot of the changes in shoulder angle as a function of mill speed. The shoulder angle determines power draw due to the mill’s charge motion as shown in Model C. Clearly, the position of the shoulder angle is driven by the fraction of the theoretical critical speed, which at the same time drives the mill power draw and thus the mill throughput. However, this does not imply a higher efficiency of the grinding process since the ball trajectory will change and a portion of the ball charge may impact the liner and not the ore thus wasting energy. Equation 5-2 is Bond’s equation that correlates mill energy consumed and ball consumption. Although it is well known that the equation over estimates ball consumption when compared to real plant data, it helps to understand the relationship between power and ball consumption. As the mill speed 49  increases, the power draw increases and thus so does ball consumption. It is important to note that even if ball consumption increases, specific ball consumption (grams of ball per tonne of ore) may decrease since the maximum power draw is constant, whereas mill throughput can be increased.    Figure 5-1 Mill Power Draw Vs. Fraction of Theoretical Mill Speed  𝒌𝒈/𝒌𝑾𝒉 = 𝟎. 𝟏𝟔(𝑨𝒊 − 𝟎. 𝟎𝟏𝟓)𝟎.𝟑𝟑        Equation 5-2  50    Figure 5-2 Convention for describing Shoulder and Toe Angle of a mill ball Charge  Figure 5-3 Shoulder Angle vs. fraction of critical speed  45o225203o214o68o23o0o34o56o45o225203o214o68o23o0o34o56ov vvvvvvvvvvvvvvvvv51  Table 5-1 Summary of Total Power Draw and Shoulder Angle From Model “C”      MODEL "C" FOR MILL POWERBall Mill 4.5mx 5.0mMill Internal Diameter Inside LinersCylindrical Length inside liners(Belly length)Fraction of Theoretical Critical SpeedCenter Line LentgthOre DensityBall densityBall Fractional mill fillingTotal Mill Filling Fraction%Vol solids in slurry, fractionShoulder AngleShoulder AngleNo-Load PowerPower Draw due to motion of ChargePower draw of Cone End  Charge MotionGross PowerDi L φ ρₒ ρB Fb Ft ρp ϴs ϴs P Pt Pc Pptm m % m Radians Degrees kW kW kW kWNo Liners 4.5 5 0.773 5 3.45 7.8 0.45 0.45 0.36 1.115 64 111 1673 0 2219Liners with LiftersNew Liners 4.23 4.73 0.700 5 3.45 7.8 0.45 0.45 0.36 0.951 55 86 1200 0 1598New Liners 4.23 4.73 0.750 5 3.45 7.8 0.45 0.45 0.36 1.063 61 91 1310 0 1742New Liners 4.23 4.73 0.773 5 3.45 7.8 0.45 0.45 0.36 1.115 64 94 1356 0 1802New Liners 4.23 4.73 0.810 5 3.45 7.8 0.45 0.45 0.36 1.199 69 97 1418 0 1884New Liners 4.23 4.73 0.850 5 3.45 7.8 0.45 0.45 0.36 1.292 74 101 1458 0 1939New Liners 4.23 4.73 0.900 5 3.45 7.8 0.45 0.45 0.36 1.409 81 106 1421 0 1896New Liners 4.23 4.73 1.000 5 3.45 7.8 0.45 0.45 0.36 1.584 91 116 471 0 70952  5.2 Ball Trajectory The mill’s rotational speed not only affects its power draw but also the trajectory of the grinding balls, which simultaneously affects grinding efficiency and liner/ball wear. The grinding ball trajectory is further affected by the liner design and lifter face angle. Powell (1991) explained that there is a direct relationship between mill speed and the impact angle of the ball charge and charge trajectories. Also, Powell (1991) found the lifter bar height had a strong influence on the charge trajectory. Figure 5-4 shows the definition of different angles at a constant mill speed but with different liner lifter face angles, which shows the effect of the lifter face angle on the shoulder angle and impact angle.  Figure 5-4 MillTraj® Software Convention on Measurement of AnglesLiner Lifter Shapes Angle of Impact “Toe Angle” or Location of charge base Toe Angle Shoulder Angle 53  5.2.1 Liner Lifter Shapes Figure 5-5 shows the three different types of liners and their shape changes as they wear over time. The magnetic liner does not wear and therefore the shape and face angle do not change. Steel liners and magnetic liners have about the same thickness but are thinner than rubber liners. Liner thickness affects mill throughput, and liner lifter face angle impacts efficiency. New rubber liners have a 90-degree face angle that decreases at a slower pace than steel liner face angles. Due to the wavy pattern of steel liners, the face angle is below 65 degrees. Magnetic liners have no designed face angle; rather, the face angle is created by the liner’s magnetic field and the difference in height between its plate and lifter. Although the difference in height is 1.5 cm, the wavy pattern is still shallow due to the magnetic material and ball scats that are attached to the liner surface. The most important parameter when selecting liners is the lifter face angle which drives the impact position of the ball inside the mill (impact angle) and the mill power draw. If a ball mill grinding application requires the production of fines by attrition, then a liner with a low face angle is adequate. 5.2.2 Ball Trajectory and Mill Power Draw To estimate mill power draw, Morrel’s Model C requires the mill’s speed, % ball loading, and internal diameter. However, Model C does not account for the liner lifter face angle which has an impact on power draw. Plant data and mill operating experience show that mill power draw decreases as the liner wears. When the liner lifter height decreases, the face angle of the lifter bar also decreases. Mill operators compensate for the loss of power by, if possible, adding more balls or by increasing the mill speed if a variable speed driver is available.  54  STEEL LINERS   RUBBER LINERS   MAGNETIC LINERS (Powell, 2006)     Figure 5-5 Type of Ball Mill Liners Steel Liner/wave lifters Mill Shell Magnet Mill Shell Rubber lifter  Rubber Plate 55  .MillTraj® estimates the ball trajectory and the shoulder and toe angles, based on the lifter height and face angle. The decrease of power draw as the rubber liner wears is summarized in Table 5-2. This Table shows the relationship between shoulder angle and power draw as the liner lifter wears.The shoulder angle decreases as the liner lifter face angle decreases due to wear. The calculation details are shown in Appendix 2.  Table 5-2: Model C Power Draw Vs. Rubber Liner Service Life @75% CS  The MillTraj® departure angle (shoulder angle) results are shown in Figures 5-6 A–B, and the lifter face angle as the rubber liner wears is shown in Figure 5-6 C. The details of the simulations for other mill speed conditions are shown in Appendix 3. The same simulation results shown in Figure 5-6 were obtained for steel and magnetic liners as shown in Appendix 3. The steel liner ball trajectory, shown in Figure 5-7, shows a lower shoulder angle than that of the rubber liner at the same % of critical speed due to the wave liner’s lower face angle. In the case of the magnetic liner, the ball trajectory is shown in Figure 5-8 when using an assumed double low profile with a 30o face angle, since the face angle is determined by the magnetic field and approximately 1.5 cm height difference between plates and lifters.  Rubber Liner Service Life @ 75% CSMill Internal Diameter Inside LinersCylindrical Length inside liners(Belly length)Fraction of Theoretical Critical SpeedBall Fractional mill filling%Vol solids in slurry, fractionShoulder AngleToe AngleGross PowerNotesDi L φ Fb ρp ϴs ϴt Pptm m % % % Degrees Degrees kWNew Liners 7.075 11.616 0.750 0.271 0.4574 71 236 12,533        12682 kW Max. Installed Power6 Months Service 7.195 11.746 0.750 0.251 0.4574 47 239 13,034        12 Months Service 7.235 11.806 0.750 0.245 0.4574 25 240 12,285        End of service Life56     Figure 5-6  MillTraj Simulation Results  A MillTraj® Ball Trajectory at different lifter face angles (Front Angle) B Table Results C Rubber Lifter Face Angle and shape 57  Figure 5-7 Ball Trajectory along the service life of a steel liner The magnetic liner’s results show an even lower shoulder angle than that of the steel and rubber liner. The power draw is also lower than that of the rubber and steel liner, as determined by Model C. The results shown in Table 5-2 indicate the need to increase mill power draw to achieve the target production rate and product particle size (P80) as the liner wears. Since most mills have  fixed speed drives, the only option operators have is to increase ball charge if the mill is working at less than 45% ball loading. Otherwise, the operator can only increase the product size, reduce production rate or shut down the mill to replace the liners. An alternative option is to increase the mill critical speed from 75% to 85%; however, as stated few secondary ball mills have variable speed drivers that would allow the operator to increase mill critical speed.  58   Figure 5-8 Ball Trajectory when using a magnetic liner 5.3 Ball Mill Speed Ball mill speed is defined as a percentage of the mill’s critical speed. A critical speed of between 70-75% is common for ball mills. Most SAG mills and a few ball mills have variable speed drivers that allow operators to modify the mill speed, control the power draw, and thus throughput. However, plant data (Figure 5-10) show an increasing operating work index Wio (increased inefficiency) as the liner wears along the liner service life. This inefficiency is not readily noticeable since it requires an indicator that is different than the specific energy consumption, power, or tonnage that are commonly plotted and analyzed by mill operators. The calculation of the operating work index, power draw, and the simulation results of the ball trajectory at different lifter face angles helps to explain the increased inefficiency of mills as the liner wears along its service life.  59  5.3.1 Liner Lifting Capacity, Ball Trajectory and Grinding Efficiency  Although power and thus throughput are strongly affected by mill speed, the relationship between them is not linear. In fact, power draw decreases when the mill reaches 90% of critical speed, as shown in Figure 5-1. As previously discussed, the face angle of the liner lifter has a considerable impact on mill power draw. Table 5-2 shows that as the liner wears, the face angle decreases. Therefore, the shoulder angle and the mill power draw decreases. At this point, the options for mill operators to maintain power draw are limited to increasing the ball loading or to increasing mill speed, which in many cases is not possible since most mills have fixed speed motors. Table 5-3 summarizes the calculation results, showing the relationship between critical speed, liner wear, shoulder angle and mill total power draw. The power draw with new liners at 75% Cs (Critical Speed) and 12,626 kW can be maintained when the service life of the liners is 12 months at 80% Cs, which implies that production rate can be maintained. Calculation details are shown in Appendix 4. In summary, when the liner wears, the lifter face angle decreases as does the shoulder angle. However, if the ball mill has a variable speed driver and the fraction of the critical speed can be increased, then the mill power draw can be increased to maintain the mill throughput.  Shoulder angles for 6 month old worn liners shown in Table 5-3were obtained using MillTraj® by changing the percentage of mill critical speed. The ball trajectory and shoulder angle are shown in Figure 5-9A. Figure 5-9B shows the output values of the simulation.  The shoulder angle is under the column “Depart Angle”. Mill operators also face the efficiency problem shown in Figure 5-10. This Figure shows an almost constant power draw during the 60  service life of the liner and a specific power consumption of between 14 and 15 kWh/t of ore. However, when the Operating Work index (Wio) is considered in the calculations, there is an evident increase from a minimum 25 to maximum 30 kWh/t that indicates grinding inefficiency. The same Wio trend for a SAG mill can be seen in Figure 5-11 where the SAG Wio increases as the liner wears. It is interesting to note that the Wio decreases towards the end of the liner service life in line with a slight increase in % of SAG critical speed, as shown in Figure 5-12. The details of the plant data and calculations are shown in Appendix 5.  61  Table 5-3 Effect of Wear and Fraction  of Critical Speed on Mill Power Draw   Rubber Liner Service Life Mill Internal Diameter Inside LinersCylindrical Length inside liners(Belly length)Fraction of Theoretical Critical SpeedBall Fractional mill filling%Vol solids in slurry, fractionShoulder AngleToe AngleGross Power-Milltraj Shoulder anglesNotesDi L φ Fb ρp ϴs ϴt PptNew Liners @75% CS 7.075 11.616 0.75 0.271 0.4574 71 236 12,626             12682 kW Inst.New Liners @80% CS 7.075 11.616 0.8 0.271 0.4574 71 236 13,462             New Liners @85% CS 7.075 11.616 0.85 0.271 0.4574 71 235 14,242             6 Months Service @ 75% CS 7.195 11.746 0.750 0.251 0.4574 47 236 12,523             6 Months Service @ 80% CS 7.195 11.746 0.800 0.251 0.4574 54 236 13,493             6 Months Service @ 85% CS 7.195 11.746 0.850 0.251 0.4574 64 235 14,339             12 Months Service @ 75% CS 7.235 11.806 0.750 0.245 0.4574 25 236 11,674             12 Months Service @ 80% CS 7.235 11.806 0.800 0.245 0.4574 32 236 12,827             12 Months Service @ 85% CS 7.235 11.806 0.850 0.245 0.4574 39 235 13,924             End of Life62       Figure 5-9 Shoulder Angle at Different Fraction of Critical Speed    A B 63  Figure 5-10 Ball Mill Operating Work Index within Liner Changes  Liner Change New Liner New Liner  Liner Change 64  Figure 5-11 SAG Mill Operating Work Index within Liner Changes 65  Figure 5-12 SAG Mill Operating Work and Critical Speed 66   Figure 5-13 Bond Work Index of SAG Mill Feed 67  5.3.2 Liner Type Power Draw Comparison at Different Mill Speeds and Service Life Figure 5-14 shows the estimated power draw at 6 months of service life for steel, rubber and magnetic liners. At 75% critical speed, the power draw of rubber and magnetic liners (at maximum assumed liner lifter face angle) is higher than that of new liners due to their thinner thickness accommodating more grinding balls in the mill. The steel liner is also thin but its lifting capacity is lessened by wear, causing a lower power draw. At mill speeds higher than 75%, the power draw of all the liner types increases above that of a new liner. By the end of the liner service life (approximately 11 months), power draw decreases at 75% critical speed, as shown in Figure 5-15. The power drops from 12,626 kW to 12,486kW for rubber liners, from 12,485 kW to 10,987 kW for steel liners, and from 12,532 to 10,407 kW for magnetic liners. The decrease in power draw is due to the decreased lifting capacity that occurs when the liner lifter angle decreases below 45 degrees. The rubber liner requires an increase to about 78% of critical speed to maintain its initial power draw. The steel liner requires an increase from about 80% to 82% of critical speed to maintain power draw. The magnetic liner requires an increase to about 85% of critical speed at its minimum lifter angle to recover the initial power draw similarly to that of the rubber liner.    68      Figure 5-14 Power of Different Type of Liners at Different Speeds and 6 month Service Life  Figure 5-15 Power of Different Type of Liners at Different Speeds and 12 months Service Life 69  5.3.3 Effect of Mill Speed on the Grinding Efficiency Ball trajectory is affected by the mill’s speed and liner lifter face angle as shown in 5-9. The grinding balls may impact the mill shell above or below the toe which determines the effective use of ball energy for breaking ore particles. Figure 5-9 shows that at 85% of critical speed for a liner service life of 6 months and a lifter face angle of 58o, the balls will impact the mill shell and not the ore. Figure 5-11 and Figure 5-12 show the SAG Wio during the years 2016 and 2017. It is important to note that the Wio increases as the liner wears but decreases towards the end of its service life. This improvement can be explained by a slight increase to the SAG mill’s % critical speed. However, it is not possible to calculate the amount of energy wasted on ball-liner impacts from plant data only. The overall increase of inefficiency due to ball-liner and ball-ball impacts can be estimated by using the Wio or overall specific energy consumption. Figure 5-13 shows the ore hardness variability in terms of the Bond Work Index (Wi). The Wi varies between 9 to 15 kWh/t which does not affect the operating work index trend that helps to predict the increase of grinding inefficiency. Figure 5-16 shows the frequencies for a range of Wio taken from Figure 5-10 for May to March 2017.  The frequency of ball mill Wio values less than or equal to 25.3 was 94, equivalent to 31% of the total liner service life. The frequency of Wio values greater than 27 was 111, equivalent to 36% of the total service life. Assuming that a mill’s optimum operating conditions can be maintained at a Wio of 25.3 along the liner service life, then, by using a F80 of 5,000 microns (average per year), a P80 of 225 microns (average of the first 5 months), and a Wio of 25.3 for non-optimum operating conditions, the difference in energy consumption would be 70  313,595 kWh. At an energy cost of 0.065 dollars per kWh, the minimum energy cost savings per year would be $CAD 20,384 per liner service life of approximately 10 months.  Figure 5-16 Ball Mill Operating Work Index Frequency   71  Chapter 6: Discussion  The hypothesis tested in this thesis was that the shape of the lifter liner drives grinding efficiency independently of the type of liner used in a ball mill. It was proven correct through an analysis of mill operating data collected between 2014 and 2017 from two copper mine ball mills and SAG mills. Data collected from the operating plants for this thesis are from SAG mills fitted with steel liners and ball mills with rubber liners. Morrell’s Model C was used to estimate mill power draw and MillTraj® software was used to simulate the ball trajectory as a function of the liner lifter profile as it wears during its service life. These methods have been fundamental in demonstrating how changes in mill power draw occur due to decreasing shoulder angle values. 6.1 Mill Power Draw and Ball Trajectory-Mill Charge Shoulder Angle At the early stages of this research, the discrepancy of power draw of a 4.5m x 5.0m ball mill could not be explained with existing correlations to estimate mill power draw. The calculated mill power draw using Model C was 21% higher than measured (1,802 kW vs. 1,490 kW from Figure 6-1 A-B). This discrepancy, shown in Figure 6-1 (A) and Figure 6-1 (B), shows the differences in calculated and real mill power respectively. The literature reviewed shows there are conflicting views to determining mill power draw. It was previously believed that the liner lifter did not affect mill power draw (Fuerstenan, D.W. & Abouzeid, 1985). However, Powell and Vermeulen (1994) demonstrated that the liner lifter spacing, height and face angle do affect it significantly.  72   Figure 6-1 Power Calculation Comparison This thesis compared power draw estimates for the same dataset using Morrell’s Model C both with and without a corrected shoulder angle obtained from MillTraj®. The corrected shoulder angle estimates better reflect the real data since they show mill power draw increases as the liner wears and then decreases due to the decreasing face angle of the liner lifter. Mill power draw obtained with only Model C shows increasing power draw as the liner wears, as shown in Table 6-1. The Model C estimate ranges from 12,297 kW to 13,202 kW. However, when correcting the shoulder angle, power draw increases from 12,533kW to 13,034 kW and then drops to 12,285 kW, which better reflects the plant data.   Primary Ball Mill: 4.5m x 5.0 m.Shoulder Angle: 64Toe Angle: 209%C.S.: 77New Liner1802Power Draw-kW from Model C4522520321468230o3456ov vvvvvvvvvvvvvvvvvPrimary Ball Mill: 4.5m x 5.0 m. Shoulder Angle: 23Toe Angle: 209%C.S.: 77New Liner1490Power Draw-kW4522520321468230o3456ov vvvvvvvvvvvvvvvvvA Calculated Power DrawB Real Power 73  Table 6-1 Comparison of Mill Power Draw Estimate Using Model C  6.2 Calibration factor ‘k’ in Model C Morrell obtained the calibration factor “k” in Model C, Equation 2-4, empirically from 82 operating mill datasets. After applying the “k” factor, Model C’s standard deviation is 5% of the observed data. The study did not indicate the point in the liner’s service life when the data were taken nor the liner lifter shape. For ball mills, the operating philosophy is based on maintaining the highest constant power draw by adding grinding media, often at the cost of grinding efficiency. This mill operating philosophy may explain the positive correlation  between plant data and Model C. However, it hinders the understanding of decreasing mill efficiency as the liner wears since it returns higher values of power draw at the end of service life than real the power draw. 6.3 Mill Charge Shoulder Angle and Mill efficiency The thesis results show that shoulder angle increases as the % of critical speed increases, meaning that if ball or SAG mill speed increases along the liner service life, the Wio could be reduced. This analysis shows ball trajectory and shoulder angle decrease as the liner wears and the Wio increases, thus indicating decreased grinding efficiency. The operating work index, Wio, was useful in demonstrating that liner wear changes grinding efficiency because it takes feed and Rubber Liner Service Life @ 75% CS Gross Mill Power from Model C Gross Mill Power from Model C Using corrected shoulder angle  kW kW New Liners 12,297 12,533 6 Months Service 12,958 13,034 12 Months Service 13,202 12,285 74  product size into account as well as specific energy consumption. Common control parameters – throughput tonnage, power draw, and specific energy – cannot clearly demonstrate grinding efficiency alone for the following reasons: ● Tonnage varies according to target plant throughput at the expense of efficiency and grind product size ● Power draw is maintained at its maximum to maximize plant throughput ● Specific energy, expressed as kWh/t of ore, can be decreased by increasing tonnage, but doing so also increases product grind size. 6.4 Liner Types The rubber, steel, and magnetic liners analyzed are described in terms of mill power draw, shoulder angle and ball trajectory. The only major difference among these three liner types is service life, because the results of the analysis indicate that it is possible to reach better grinding efficiency with each type by controlling the shoulder angle using varying mill speed. The literature review shows that the effect liner shape has on mill efficiency has been investigated since 1964. It is notable that the key issues and relationships identified in this study between mill performance and liner configuration have been the focus of research during the last decade. This thesis upholds these foundational studies by demonstrating that changes in liner face angle requires different mill speeds to maximize efficiency. 6.5 Operating Work Index This thesis addressed the unresolved issue of mill power draw as a function of liner lifter angle. The liner profile’s effect was not originally considered in the Model C equation (Morrell, 1996a). Applying a corrected shoulder angle obtained from MillTraj® simulations to the model accounts 75  for the difference between predicted and measured Wio values. The corrected shoulder angle simulates ball trajectory based on the mill’s liner profile and speed. Mill throughput and power draw were evaluated as a function of mill volume and ball charge at 75% critical speed. Although most ball mills are installed with fixed speed drives, mill speed plays a key role in throughput and grinding efficiency, and was also considered in the study for this reason. The overall decrease in efficiency due to ball-liner and ball-ball impacts can be estimated by using the operating work index. Clearly, the operating work index increases as the liner wears, but it can go unnoticed by mill operators who only monitor throughput and specific energy consumption kWh/t of ore at maximum mill power draw. In conclusion, the mill’s liner type, rubber, steel, or metallic magnetic, does not directly impact grinding efficiency, but its lifter shape does. Grinding efficiency can be improved by varying mill speed as the liner lifter wears and its face angle changes. The correlation between liner lifter height and mill tonnage can be used to develop an operating strategy based on the mill’s liner lifter profile, power draw and tonnage. 6.6 Maintaining Ball Mill Efficiency by Increasing Liner Change Frequency – Scenario 1 There are two main operating conditions that affect mill performance during the liner service life: liner thickness and liner lifter angle. Tonnage and mill power draw are lower during approximately the first half of the liner service life, but the mill operates at a higher efficiency (Table 6-2). Toor (2013) concluded that if liners with a thinner than usual average thickness of 0.15m are designed to last and are replaced before mill production drops, then a higher overall production tonnage can be achieved even though the mill has to be shut down for relining.  76  Applying Toor’s conclusion to the liner service life and the operating data shown in Figure 5-10, the first production period would be the same as shown in Table 6-2, but the second period’s production rate would increase from 871 to 901 tonnes per hour (tph). Moreover, the grinding efficiency would be 25.4 kWh/t, as shown in Table 6-3.  Table 6-2 Current Production and Operating Indicators  Assuming a ball mill shut down for 20 hours to replace liners, the production loss will be 18,020 tonnes. However, the total production for the same period of time of using scenario 1 will be 6,261,880 which is 54,566 tonnes higher than the current production of 6,207,314.  Table 6-3 Scenario 1 - Production and Operating Indicators  Accumulated Average Evaluation Period  kWh Tonnes Operating Hours P80 Wio kWh/t tph Power kW  First Period, 75% Cr.Sp.  57,039,293 4,098,620 4,551 219 25.44 13.92 901 12,535 Loss Production due to Liner Change - 18,020 20    901   Second Period,75% Cr.Sp.  30,356,227 2,181,280 2,422 219 25.44 13.92 901 12,535  Total  87,395,519 6,261,880 6,952        Evaluation Period  Accumulated Average kWh Tonnes Operating Hours P80 Wio kWh/t tph Power kW  First Period   May 5-2016 to Oct.1  2016  57,039,293 4,098,620 4,551 219 25.44 13.92 901 12,535  Second Period   Nov 2 2016 to Mar 13 2017  30,669,822 2,108,694 2,422 230 27.42 14.54 871 12,664 Total 87,709,115 6,207,314 6,972      77  The benefits of scenario 1 are quantified in Table 6-4. At a copper price of $3.0 per pound, ore head grade of 0.45 and overall copper recovery of 89%, the benefit increase would be $1,070,343 per liner service life cycle at approximately 10 months after deducting production losses and extra costs to purchase the second set of liners.   Table 6-4 Scenario 1- Benefits of Replacing Liner before the End of Life kWh savings 313,595 $ per year @0.065$/kWh 20,384 Increased Tonnage, tonnes 54,566 %Cu Head Grade 0.45 %Cu Overall Recovery 89 Increase Cu Production, tonnes  219 Cu Price, US$/Lb 3.0 Increase Cash Flow $1,445,343 Approximate rubber liner cost -$375,000  Net Cash flow $1,070,343  This approach is sensitive to the number of hours that it will take to change the mill liners as shown in Figure 6-2. The expected time to reline a mill is between 20 to 36 hours. The benefits of this approach are offset when relining time exceeds 60 hours. At this point production losses become greater than production gains from higher tonnage. 78    6.7 Maintaining Ball Mill Efficiency by Operating a Ball Mill at High Speed – Scenario 2 An alternative option to increasing mill liner change frequency is to maintain grinding efficiency by increasing mill speed as explained in section 5.3.1. Increased mill speed takes place during the second period of the liner’s service life when the Wio increases above 25.4  kWh/t. The tonnage, power consumption, P80, and mill efficiency during the first period of the service life remain the same as per the operating plant data. However, during the second period of liner service life, the mill’s critical speed could be increased to 79%. Power draw at this high speed was calculated using the shoulder angles of worn liners from MillTraj and the Model C data with the corrected shoulder angle. Table 6-5 shows the calculated mill power draw when using the MillTraj shoulder angles at the corresponding percent of critical speed. The benefits of running  $(400,000) $(200,000) $- $200,000 $400,000 $600,000 $800,000 $1,000,000 $1,200,000 $1,400,00012 20 36 48 60 72$CAD, Net Cash FlowRelining Time, HoursFigure 6-2 Cash Flow Vs. Relining Time 79  the mill at higher speed during the second period of the liner service life were calculated at a power draw of 12,787 kW at 79% of critical speed as shown in Table 6-6.  Table 6-5 Increase of Power Draw Vs. Increase of Mill Power Draw Power % Cr Speed 12,535 75 12,764 77 12,787 79  Increasing critical speed during the second liner service life period raises energy consumption by 298,954 kWh and the mill tonnage by 72,585 tonnes. The net benefit after deducting the extra cost for energy consumption at high mill speed is $1,903,230 per liner service life. It should be noted that this economic benefit can only be realized for primary ball mills or if the secondary ball mill is a bottleneck in the grinding circuit.  Table 6-6 Scenario 2 - Production and Operating Indicators Evaluation Period Accumulated Average at MillTraj Shoulder Angles kWh Tonnes Operating Hours P80 Wio kWh/t Tonnes per hour Power kW  First Period,75% Cr.Sp.  57,040,768 4,098,620 4,551 219 25.44 13.92 901 12,535  Liner Change loss Production - - - - - - - -   Second Period,79% Cr.Sp.  30,967,301 2,181,280 2,422 219 25.97 14.20 901 12,787 Total 88,008,069 6,279,900 6,972       80  Table 6-7 Scenario 2- Benefits of Replacing Liner before the End of Life       6.8 Limitations and Future Work This thesis relies on approximate liner lifter face angles and heights. Thus, there is room to improve mill power draw simulations, and mill % filling and efficiency estimates by 3D scanning the mill liner every time the mill is down. By correlating the 3D scanning results, liner face angles, % mill filling, and operating data, it is possible to improve the accuracy of models to predict power, throughput and liner life as the liner wears.  Although the Bond Work index of plant feed varied between 11.22 kW/t and 13.53 kW/t for the SAG mill operating data shown on Figure 5-11, the Wio is not significantly affected and still offered a trend of decreasing grinding efficiency proving that the Wio is still a valid tool to monitor grinding efficiency.  Some mining operations, like tin and iron, require low production of fine material to reduce losses to the tailings. Since higher shoulder angles (catarating) produce less fines than that of lower shoulder angles (cascading), production benefits can be realized with variable speed drives (VSD) or by changing the liner lifters more frequently to avoid the cascading effect of low shoulder angles. kWh savings (298,954) $ per year @0.065$/kWh (19,432) Increased Tonnage 72,585 %Cu Head Grade 0.45 %Cu Overall Recovery 89 Increase Cu Production, tonnes 291 Cu Price, US$/Lb 3.0 Increase Cash Flow  $1,922,662  Net Increase Cash Flow  $          1,903,230  81  Chapter 7: Conclusions and Recommendations Ball trajectory is strongly affected by face angle of the liner lifter. If steel, rubber or magnetic liners had the same thickness, profile-face angle, and service life, then there would be no difference in performance. Ball trajectory and mill power draw would be the same. Although steel liners are thinner than rubber and have a higher initial throughput, they have a shorter service life of 12 months versus 14 to 16 months for a rubber liner. Magnetic liners have the longest service life of 18 to 24 months for non-iron ores, extending up to 60 months for iron ores. However, the magnetic liner face angle is around 30 to 40 degrees, which is similar to that of worn steel or rubber liners. Consequently, shoulder angle and mill power draw when using magnetic liners are lower than that of steel or rubber liners. The implication of this low-profile, 30-40 degrees angle, is a charge cascading motion that results in a lower throughput compared to the other liner types.      Grinding Efficiency and Mill Speed Power calculations show that liner weight only effects no-load power, which is less than 2% of the installed power. Plant data show that as a liner wears, the Wio increases, indicating decreased grinding operation efficiency. Steel and rubber liner face angles change as they wear, which affects grinding efficiency. Magnetic liner face angles do not change but their shoulder angle is much lower than that of rubber and steel liners. For ball mills with variable speed drivers, it is possible for a magnetic liner to outperform steel and rubber liners in terms of efficiency, mill operation, and service life, since mill speed can be increased to obtain similar shoulder angles and thus better mill throughput at a constant liner face angle.  82  Two scenarios for increasing mill efficiency were analyzed. The first one involves changing the liner before the efficiency drops and the second requires increasing the mill speed from 75% to 80%. Both approaches show considerable financial benefits. However, the benefits for the scenario of increasing the frequency of changing the liner depends on the time needed for liner replacement resulting in lost production. Effect of Liner Lifters The purpose of this thesis was to analyze factors affecting mill power draw when using the three most widely used ball mill liners. The hypothesis was that a liner’s shape and a lifter’s face angle drive a ball mill’s grinding efficiency and throughput independently of the type of liner used. Several years of mill operating data, published research papers, and MillTraj® simulations were used to test the hypothesis.  The thesis results indicate that the lifter face angle is important for ball trajectory. Specifically, a face angle that is more than 60 degrees is more likely to throw the balls against the mill liner, damaging it and wasting energy. A low face angle, less than 35 degrees, reduces mill throughput and the cascading effect will produce more fines than a high face angle that produces a cataracting effect. In light of these results, a steel liner has an initial face angle that provides maximum efficiency, while rubber liners need time to wear and achieve the right thickness and face angle for maximum grinding efficiency. In both cases, grinding efficiency decreases towards the end of the liner lifter service life when the face angle decreases from 40o to 30o. Magnetic liner service life is longer than steel and rubber liners, however, the lack of lifters decreases the shoulder angle and power draw, thereby negatively affecting mill throughput. For rubber and steel types, 83  grinding efficiency can be increased by adjusting mill speed as the liners wear. For magnetic liners, the mill motor must be selected in such a way that the mill can run at a higher speed of between 80-85% critical to achieve the same throughput and efficiency as the steel and rubber liners. There are two options to take advantage of the mill efficiency in light of these results, by either decreasing liner thickness and changing liners sooner, or by controlling mill speed to improve the operating work index. Recommendations This thesis shows that ball trajectory, and thus mill charge shoulder angle, is strongly affected by the liner lifter face angle, which drives throughput. As such, adding a corrected shoulder angle to the Model C power equation was a major contribution of this thesis. Modelling results and the literature review validate the hypothesis that mill grinding efficiency can be maintained by varying the percent of mill critical speed. The operating work index was found to be an effective indicator of grinding inefficiency along the liner service life. However, caution is necessary when ore hardness varies during evaluation, since it can lead to a variable operating work index. Although this thesis used Morrell’s equations and MillTraj® software to calculate mill power draw under different liner profiles and ball trajectories separately, further research is required to include the effect of liner profile in Morell’s Model C power equations.  Magnetic liners present a longer service life compared to steel or rubber liners with the additional benefit of a constant liner face angle. However, the magnetic liner has a low face angle that reduces mill power draw and thus mill throughput. More research is required in terms of material and liner design to improve the face angle of the magnetic liner and its impact 84  resistance for non-iron ores processing mills since the protective layer of scats may be thin and the ball impact could damage the magnet protective metallic shell. The total cost of a set of liners should be included in the evaluation in addition to production increases or losses. 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Elsevier Ltd, 83, pp. 64–77. doi: 10.1016/j.mineng.2015.08.016.  90  Appendices Appendix 1: Total Power Draw and Shoulder Angle from Model “C”     MODEL "C" FOR MILL POWERBall Mill 4.5mx 5.0mMill Internal Diameter Inside LinersCylindrical Length inside liners(Belly length)Fraction of Theoretical Critical SpeedCenter Line LentgthOre DensityBall densityBall Fractional mill fillingTotal Mill Filling Fraction%Vol solids in slurry, fractionShoulder AngleShoulder AngleFractional Porosity of chargeGriding media voidage occupied by slurrySlurry Pool Angle Overflow Mills(Conical) Length inside LinersTrunion RadiusCharge DensityExperimental Critical speedToe AngleToe AngleMill Rev per secondMean Time between toe and ShoulderInternal radiousMean radial PositionMean Time between Shoulder and ToeActive fraction of the chargeInner surface Radious of chargeParameterNo-Load PowerPower Draw due to motion of ChargePower draw of Cone End  Charge MotionGross PowerDi L φ ρₒ ρB Fb Ft ρp ϴs ϴs E U ϴto Ld rt ρc φc ϴt ϴt Nm tc rm ȓ tf β ri z P Pt Pc Pptm m % m Radians Degrees Radians m rt=rm/4 RadiansDegrees rev/s m kW kW kW kWNo Liners 4.5 5 0.773 5 3.45 7.8 0.45 0.45 0.36 1.115 64 0.4 1 3.394 0 0.563 5.433 1.020 3.653 209 0.257 4.64 2.25 1.682 0.690 0.871 1.317 0.8 111 1673 0 2219Liners with LiftersNew Liners 4.23 4.73 0.700 5 3.45 7.8 0.45 0.45 0.36 0.951 55 0.4 1 3.394 0 0.529 5.433 1.020 3.666 210 0.240 4.73 2.12 1.539 0.642 0.881 1.163 0.8 86 1200 0 1598New Liners 4.23 4.73 0.750 5 3.45 7.8 0.45 0.45 0.36 1.063 61 0.4 1 3.394 0 0.529 5.433 1.020 3.659 210 0.257 4.56 2.12 1.568 0.661 0.873 1.215 0.8 91 1310 0 1742New Liners 4.23 4.73 0.773 5 3.45 7.8 0.45 0.45 0.36 1.115 64 0.4 1 3.394 0 0.529 5.433 1.020 3.653 209 0.265 4.50 2.12 1.581 0.669 0.871 1.238 0.8 94 1356 0 1802New Liners 4.23 4.73 0.810 5 3.45 7.8 0.45 0.45 0.36 1.199 69 0.4 1 3.394 0 0.529 5.433 1.020 3.635 208 0.278 4.41 2.12 1.602 0.677 0.867 1.274 0.8 97 1418 0 1884New Liners 4.23 4.73 0.850 5 3.45 7.8 0.45 0.45 0.36 1.292 74 0.4 1 3.394 0 0.529 5.433 1.020 3.593 206 0.291 4.35 2.12 1.627 0.681 0.865 1.314 0.8 101 1458 0 1939New Liners 4.23 4.73 0.900 5 3.45 7.8 0.45 0.45 0.36 1.409 81 0.4 1 3.394 0 0.529 5.433 1.020 3.466 199 0.309 4.36 2.12 1.666 0.666 0.868 1.370 0.8 106 1421 0 1896New Liners 4.23 4.73 1.000 5 3.45 7.8 0.45 0.45 0.36 1.584 91 0.4 1 3.394 0 0.529 5.433 1.020 2.244 129 0.343 5.22 2.12 1.803 0.283 0.949 1.530 0.8 116 471 0 70991  Appendix 2: Model “C” Power Draw Vs. Liner Service Life at 75% Crt.Sp   MODEL "C" FOR MILL POWER - RUBBER LINERSCopper Mine in North AmericaMill Internal Diameter Inside LinersCylindrical Length inside liners(Belly length)Fraction of Theoretical Critical SpeedCenter Line LentgthOre DensityBall densityBall Fractional mill fillingTotal Mill Filling Fraction%Vol solids in slurry, fractionShoulder AngleShoulder AngleFractional Porosity of chargeGriding media voidage occupied by slurrySlurry Pool Angle Overflow Mills(Conical) Length inside LinersTrunion RadiusCharge DensityExperimental Critical speedToe AngleToe AngleMill Rev per secondMean Time between toe and ShoulderInternal radiousMean radial PositionMean Time between Shoulder and ToeActive fraction of the chargeInner surface Radious of chargeParameterNo-Load PowerPower Draw due to motion of ChargePower draw of Cone End  Charge MotionGross PowerModel "C" Di L φ ρₒ ρB Fb Ft ρp ϴs ϴs E U ϴto Ld rt ρc φc ϴt ϴt Nm tc rm ȓ tf β ri z P Pt Pc Pptm m % m Radians Degrees Radians m rt=rm/4 Radians Degrees rev/s m kW kW kW kWEGLNew Liners 7.075 11.616 0.750 13.361 2.77 7.8 0.270 0.270 0.4574 0.774 44 0.4 1 3.394 0.8725 0.884 5.404 1.083 4.122 236 0.199 4.70 3.54 2.918 0.954 0.831 2.550 0.9 570 9004 304 122976 months worn Liner 7.195 11.746 0.750 13.491 2.77 7.8 0.270 0.270 0.4574 0.774 44 0.4 1 3.394 0.8725 0.899 5.404 1.083 4.122 236 0.197 4.74 3.60 2.967 0.962 0.831 2.593 0.9 595 9495 317 129581 year Worn Liners 7.235 11.806 0.750 13.551 2.77 7.8 0.270 0.270 0.4574 0.774 44 0.4 1 3.394 0.8725 0.904 5.404 1.083 4.122 236 0.197 4.75 3.62 2.984 0.964 0.831 2.607 0.9 604 9677 321 13202MODEL "C" FOR MILL POWER - RUBBER LIINERSCopper Mine in North AmericaMill Internal Diameter Inside LinersCylindrical Length inside liners(Belly length)Fraction of Theoretical Critical SpeedCenter Line LentgthOre DensityBall densityBall Fractional mill fillingTotal Mill Filling Fraction%Vol solids in slurry, fractionShoulder AngleShoulder AngleFractional Porosity of chargeGriding media voidage occupied by slurrySlurry Pool Angle Overflow Mills(Conical) Length inside LinersTrunion RadiusCharge DensityExperimental Critical speedToe AngleToe AngleMill Rev per secondMean Time between toe and ShoulderInternal radiousMean radial PositionMean Time between Shoulder and ToeActive fraction of the chargeInner surface Radious of chargeParameterNo-Load PowerPower Draw due to motion of ChargePower draw of Cone End  Charge MotionGross PowerUSING MILLTRAJ ANGLESDi L φ ρₒ ρB Fb Ft ρp ϴs ϴs E U ϴto Ld rt ρc φc ϴt ϴt Nm tc rm ȓ tf β ri z P Pt Pc Pptm m % m Radians Degrees Radians mrt=rm/4 Radians Degrees rev/s m kW kW kW kWNew Liners 7.075 11.616 0.750 13.361 2.77 7.8 0.270 0.270 0.4574 1.245 71 0.4 1 3.394 0.8725 0.884 5.404 1.083 4.122 236 0.199 5.45 3.54 3.022 1.046 0.839 2.699 0.9 570 9226 269 125336 months worn Liner 7.195 11.746 0.750 13.491 2.77 7.8 0.270 0.270 0.4574 0.820 47 0.4 1 3.394 0.8725 0.899 5.404 1.083 4.122 236 0.197 4.81 3.60 2.980 0.974 0.832 2.611 0.9 595 9559 314 130341 year Worn Liners 7.235 11.806 0.750 13.551 2.77 7.8 0.270 0.270 0.4574 0.430 25 0.4 1 3.394 0.8725 0.904 5.404 1.083 4.122 236 0.197 4.20 3.62 2.872 0.854 0.831 2.443 0.9 604 8935 335 1228592     MODEL "C" FOR MILL POWER - STEEL LINERSCopper Mine in North AmericaMill Internal Diameter Inside LinersCylindrical Length inside liners(Belly length)Fraction of Theoretical Critical SpeedCenter Line LentgthOre DensityBall densityBall Fractional mill fillingTotal Mill Filling Fraction%Vol solids in slurry, fractionShoulder AngleShoulder AngleFractional Porosity of chargeGriding media voidage occupied by slurrySlurry Pool Angle Overflow Mills(Conical) Length inside LinersTrunion RadiusCharge DensityExperimental Critical speedToe AngleToe AngleMill Rev per secondMean Time between toe and ShoulderInternal radiousMean radial PositionMean Time between Shoulder and ToeActive fraction of the chargeInner surface Radious of chargeParameterNo-Load PowerPower Draw due to motion of ChargePower draw of Cone End  Charge MotionGross PowerModel "C" Di L φ ρₒ ρB Fb Ft ρp ϴs ϴs E U ϴto Ld rt ρc φc ϴt ϴt Nm tc rm ȓ tf β ri z P Pt Pc Pptm m % m Radians Degrees Radians m rt=rm/4 Radians Degrees rev/s m kW kW kW kWNew Liners 7.135 11.616 0.750 13.361 2.77 7.8 0.270 0.270 0.4574 0.774 44 0.4 1 3.530 0.8725 1.350 5.404 1.083 4.122 236 0.198 4.72 3.57 2.942 0.958 0.831 2.571 0.9 580 9196 377 126416 months worn Liner 7.225 11.746 0.750 13.491 2.77 7.8 0.270 0.270 0.4574 0.774 44 0.4 1 3.525 0.8725 1.350 5.404 1.083 4.122 236 0.197 4.75 3.61 2.980 0.964 0.831 2.604 0.9 600 9595 386 131751 year Worn Liners 7.275 11.806 0.750 13.551 2.77 7.8 0.270 0.270 0.4574 0.774 44 0.4 1 3.522 0.8725 1.350 5.404 1.083 4.122 236 0.196 4.76 3.64 3.000 0.967 0.831 2.622 0.9 611 9812 391 13465MODEL "C" FOR MILL POWER - STEEL LINERSCopper Mine in North AmericaMill Internal Diameter Inside LinersCylindrical Length inside liners(Belly length)Fraction of Theoretical Critical SpeedCenter Line LentgthOre DensityBall densityBall Fractional mill fillingTotal Mill Filling Fraction%Vol solids in slurry, fractionShoulder AngleShoulder AngleFractional Porosity of chargeGriding media voidage occupied by slurrySlurry Pool Angle Overflow Mills(Conical) Length inside LinersTrunion RadiusCharge DensityExperimental Critical speedToe AngleToe AngleMill Rev per secondMean Time between toe and ShoulderInternal radiousMean radial PositionMean Time between Shoulder and ToeActive fraction of the chargeInner surface Radious of chargeParameterNo-Load PowerPower Draw due to motion of ChargePower draw of Cone End  Charge MotionGross PowerUSING MILLTRAJ ANGLES Di L φ ρₒ ρB Fb Ft ρp ϴs ϴs E U ϴto Ld rt ρc φc ϴt ϴt Nm tc rm ȓ tf β ri z P Pt Pc Pptm m % m Radians Degrees Radians m rt=rm/4 Radians Degrees rev/s m kW kW kW kWNew Liners 7.135 11.616 0.750 13.361 2.77 7.8 0.270 0.270 0.4574 0.815 47 0.4 1 3.530 0.8725 1.350 5.404 1.083 4.122 236 0.198 4.79 3.57 2.953 0.968 0.832 2.587 0.9 580 9251 374 127066 months worn Liner 7.225 11.746 0.750 13.491 2.77 7.8 0.270 0.270 0.4574 0.394 23 0.4 1 3.525 0.8725 1.350 5.404 1.083 4.122 236 0.197 4.14 3.61 2.854 0.841 0.831 2.419 0.9 600 8758 404 121441 year Worn Liners 7.275 11.806 0.750 13.551 2.77 7.8 0.270 0.270 0.4574 0.089 5 0.4 1 3.522 0.8725 1.350 5.404 1.083 4.122 236 0.196 3.65 3.64 2.721 0.714 0.837 2.211 0.9 611 7897 407 1107493     MODEL "C" FOR MILL POWER - MAGNETIC LINERSCopper Mine in North AmericaMill Internal Diameter Inside LinersCylindrical Length inside liners(Belly length)Fraction of Theoretical Critical SpeedCenter Line LentgthOre DensityBall densityBall Fractional mill fillingTotal Mill Filling Fraction%Vol solids in slurry, fractionShoulder AngleShoulder AngleFractional Porosity of chargeGriding media voidage occupied by slurrySlurry Pool Angle Overflow Mills(Conical) Length inside LinersTrunion RadiusCharge DensityExperimental Critical speedToe AngleToe AngleMill Rev per secondMean Time between toe and ShoulderInternal radiousMean radial PositionMean Time between Shoulder and ToeActive fraction of the chargeInner surface Radious of chargeParameterNo-Load PowerPower Draw due to motion of ChargePower draw of Cone End  Charge MotionGross PowerDi L φ ρₒ ρB Fb Ft ρp ϴs ϴs E U ϴto Ld rt ρc φc ϴt ϴt Nm tc rm ȓ tf β ri z P Pt Pc Pptm m % m Radians Degrees Radians m rt=rm/4 Radians Degrees rev/s m kW kW kW kWProgressive Liner Wear - CORRECTED SHOULDER ANGLE - MAGNETIC LINERMaximum Lift 7.137 11.616 0.750 13.361 2.77 7.8 0.262 0.262 0.4574 0.760 44 0.4 1 3.530 0.8725 1.350 5.404 1.086 4.141 237 0.198 4.67 3.57 2.957 0.960 0.829 2.595 0.9 580 9018 363 12400MODEL "C" FOR MILL POWER - MAGNETIC LINERSCopper Mine in North AmericaMill Internal Diameter Inside LinersCylindrical Length inside liners(Belly length)Fraction of Theoretical Critical SpeedCenter Line LentgthOre DensityBall densityBall Fractional mill fillingTotal Mill Filling Fraction%Vol solids in slurry, fractionShoulder AngleShoulder AngleFractional Porosity of chargeGriding media voidage occupied by slurrySlurry Pool Angle Overflow Mills(Conical) Length inside LinersTrunion RadiusCharge DensityExperimental Critical speedToe AngleToe AngleMill Rev per secondMean Time between toe and ShoulderInternal radiousMean radial PositionMean Time between Shoulder and ToeActive fraction of the chargeInner surface Radious of chargeParameterNo-Load PowerPower Draw due to motion of ChargePower draw of Cone End  Charge MotionGross PowerDi L φ ρₒ ρB Fb Ft ρp ϴs ϴs E U ϴto Ld rt ρc φc ϴt ϴt Nm tc rm ȓ tf β ri z P Pt Pc Pptm m % m Radians Degrees Radians m rt=rm/4 Radians Degrees rev/s m kW kW kW kWUSING MILLTRAJ ANGLESMaximum Lift 7.137 11.616 0.750 13.361 2.77 7.8 0.270 0.270 0.4574 0.850 49 0.4 1 3.530 0.8725 1.350 5.404 1.083 4.122 236 0.198 4.84 3.57 2.963 0.977 0.832 2.601 0.9 580 9299 371 12764Average Lift 7.137 11.616 0.750 13.361 2.77 7.8 0.270 0.270 0.4574 0.524 30 0.4 1 3.530 0.8725 1.350 5.404 1.083 4.122 236 0.198 4.32 3.57 2.867 0.882 0.830 2.460 0.9 580 8731 391 12074Minimun Lift 7.137 11.616 0.750 13.361 2.77 7.8 0.270 0.270 0.4574 0.108 6 0.4 1 3.530 0.8725 1.350 5.404 1.083 4.122 236 0.198 3.65 3.57 2.681 0.716 0.836 2.186 0.9 580 7477 393 1049694  Appendix 3: Model “C” Power Draw Vs. Liner Service Life at 80-85% Crt.Sp    MODEL "C" FOR MILL POWER - RUBBER LINERSCopper Mine in North AmericaMill Internal Diameter Inside LinersCylindrical Length inside liners(Belly length)Fraction of Theoretical Critical SpeedCenter Line LentgthOre DensityBall densityBall Fractional mill fillingTotal Mill Filling Fraction%Vol solids in slurry, fractionShoulder AngleShoulder AngleFractional Porosity of chargeGriding media voidage occupied by slurrySlurry Pool Angle Overflow Mills(Conical) Length inside LinersTrunion RadiusCharge DensityExperimental Critical speedToe AngleToe AngleMill Rev per secondMean Time between toe and ShoulderInternal radiousMean radial PositionMean Time between Shoulder and ToeActive fraction of the chargeInner surface Radious of chargeParameterNo-Load PowerPower Draw due to motion of ChargePower draw of Cone End  Charge MotionGross PowerDi L φ ρₒ ρB Fb Ft ρp ϴs ϴs E U ϴto Ld rt ρc φc ϴt ϴt Nm tc rm ȓ tf β ri z P Pt Pc Pptm m % m Radians Degrees Radians m rt=rm/4 Radians Degrees rev/s m kW kW kW kWEGLNo Liners 24'x 39.5'EGL 7.315 11.886 0.750 13.631 2.77 7.8 0.32 0.32 0.4574 0.860 49 0.4 1 3.394 0.8725 0.914 5.404 1.065 3.994 229 0.196 5.13 3.66 2.928 0.950 0.844 2.484 0.8 621 11169 403 15202Progressive Liner WearNew Liners 7.075 11.616 0.750 13.361 2.77 7.8 0.270 0.270 0.4574 0.774 44 0.4 1 3.394 0.8725 0.884 5.404 1.083 4.122 236 0.199 4.70 3.54 2.918 0.954 0.831 2.550 0.9 570 9004 304 122976 months worn Liner 7.195 11.746 0.750 13.491 2.77 7.8 0.270 0.270 0.4574 0.774 44 0.4 1 3.394 0.8725 0.899 5.404 1.083 4.122 236 0.197 4.74 3.60 2.967 0.962 0.831 2.593 0.9 595 9495 317 129581 year Worn Liners 7.235 11.806 0.750 13.551 2.77 7.8 0.270 0.270 0.4574 0.774 44 0.4 1 3.394 0.8725 0.904 5.404 1.083 4.122 236 0.197 4.75 3.62 2.984 0.964 0.831 2.607 0.9 604 9677 321 13202MODEL "C" FOR MILL POWER - RUBBER LIINERSCopper Mine in North AmericaMill Internal Diameter Inside LinersCylindrical Length inside liners(Belly length)Fraction of Theoretical Critical SpeedCenter Line LentgthOre DensityBall densityBall Fractional mill fillingTotal Mill Filling Fraction%Vol solids in slurry, fractionShoulder AngleShoulder AngleFractional Porosity of chargeGriding media voidage occupied by slurrySlurry Pool Angle Overflow Mills(Conical) Length inside LinersTrunion RadiusCharge DensityExperimental Critical speedToe AngleToe AngleMill Rev per secondMean Time between toe and ShoulderInternal radiousMean radial PositionMean Time between Shoulder and ToeActive fraction of the chargeInner surface Radious of chargeParameterNo-Load PowerPower Draw due to motion of ChargePower draw of Cone End  Charge MotionGross PowerUSING MILLTRAJ ANGLES Di L φ ρₒ ρB Fb Ft ρp ϴs ϴs E U ϴto Ld rt ρc φc ϴt ϴt Nm tc rm ȓ tf β ri z P Pt Pc Pptm m % m Radians Degrees Radians m rt=rm/4 Radians Degrees rev/s m kW kW kW kWNew Liners 7.075 11.616 0.750 13.361 2.77 7.8 0.270 0.270 0.4574 1.245 71 0.4 1 3.394 0.8725 0.884 5.404 1.083 4.122 236 0.199 5.45 3.54 3.022 1.046 0.839 2.699 0.9 570 9226 269 12533New Liners 7.075 11.616 0.800 13.361 2.77 7.8 0.270 0.270 0.4574 1.245 71 0.4 1 3.394 0.8725 0.884 5.404 1.083 4.115 236 0.212 5.12 3.54 3.023 1.046 0.830 2.711 0.9 601 9846 284 13364New Liners 7.075 11.616 0.850 13.361 2.77 7.8 0.270 0.270 0.4574 1.245 71 0.4 1 3.394 0.8725 0.884 5.404 1.083 4.098 235 0.225 4.85 3.54 3.026 1.043 0.823 2.724 0.9 631 10422 298 141396 months worn Liner 7.195 11.746 0.750 13.491 2.77 7.8 0.270 0.270 0.4574 0.820 47 0.4 1 3.394 0.8725 0.899 5.404 1.083 4.122 236 0.197 4.81 3.60 2.980 0.974 0.832 2.611 0.9 595 9559 314 130346 months worn Liner 7.195 11.746 0.800 13.491 2.77 7.8 0.270 0.270 0.4574 0.946 54 0.4 1 3.394 0.8725 0.899 5.404 1.083 4.115 236 0.210 4.71 3.60 3.012 1.003 0.825 2.670 0.9 627 10339 323 140616 months worn Liner 7.195 11.746 0.850 13.491 2.77 7.8 0.270 0.270 0.4574 1.110 64 0.4 1 3.394 0.8725 0.899 5.404 1.083 4.098 235 0.223 4.69 3.60 3.052 1.032 0.820 2.735 0.9 659 11019 324 149511 year Worn Liners 7.235 11.806 0.750 13.551 2.77 7.8 0.270 0.270 0.4574 0.430 25 0.4 1 3.394 0.8725 0.904 5.404 1.083 4.122 236 0.197 4.20 3.62 2.872 0.854 0.831 2.443 0.9 604 8935 335 122851 year Worn Liners 7.235 11.806 0.800 13.551 2.77 7.8 0.270 0.270 0.4574 0.550 32 0.4 1 3.394 0.8725 0.904 5.404 1.083 4.115 236 0.210 4.12 3.62 2.918 0.896 0.822 2.525 0.9 637 9882 352 135321 year Worn Liners 7.235 11.806 0.850 13.551 2.77 7.8 0.270 0.270 0.4574 0.686 39 0.4 1 3.394 0.8725 0.904 5.404 1.083 4.098 235 0.223 4.10 3.62 2.966 0.936 0.814 2.606 0.9 669 10779 362 1470795     MODEL "C" FOR MILL POWER - STEEL LINERSCopper Mine in North AmericaMill Internal Diameter Inside LinersCylindrical Length inside liners(Belly length)Fraction of Theoretical Critical SpeedCenter Line LentgthOre DensityBall densityBall Fractional mill fillingTotal Mill Filling Fraction%Vol solids in slurry, fractionShoulder AngleShoulder AngleFractional Porosity of chargeGriding media voidage occupied by slurrySlurry Pool Angle Overflow Mills(Conical) Length inside LinersTrunion RadiusCharge DensityExperimental Critical speedToe AngleToe AngleMill Rev per secondMean Time between toe and ShoulderInternal radiousMean radial PositionMean Time between Shoulder and ToeActive fraction of the chargeInner surface Radious of chargeParameterNo-Load PowerPower Draw due to motion of ChargePower draw of Cone End  Charge MotionGross PowerDi L φ ρₒ ρB Fb Ft ρp ϴs ϴs E U ϴto Ld rt ρc φc ϴt ϴt Nm tc rm ȓ tf β ri z P Pt Pc Pptm m % m Radians Degrees Radians m rt=rm/4 Radians Degrees rev/s m kW kW kW kWNew Liners 7.135 11.616 0.750 13.361 2.77 7.8 0.270 0.270 0.4574 0.774 44 0.4 1 3.394 0.8725 0.892 5.404 1.083 4.122 236 0.198 4.72 3.57 2.942 0.958 0.831 2.571 0.9 580 9196 310 125576 months worn Liner 7.225 11.746 0.750 13.491 2.77 7.8 0.270 0.270 0.4574 0.774 44 0.4 1 3.394 0.8725 0.903 5.404 1.083 4.122 236 0.197 4.75 3.61 2.980 0.964 0.831 2.604 0.9 600 9595 320 130921 year Worn Liners 7.275 11.806 0.750 13.551 2.77 7.8 0.270 0.270 0.4574 0.774 44 0.4 1 3.394 0.8725 0.909 5.404 1.083 4.122 236 0.196 4.76 3.64 3.000 0.967 0.831 2.622 0.9 611 9812 326 13383MODEL "C" FOR MILL POWER - STEEL LINERSCopper Mine in North AmericaMill Internal Diameter Inside LinersCylindrical Length inside liners(Belly length)Fraction of Theoretical Critical SpeedCenter Line LentgthOre DensityBall densityBall Fractional mill fillingTotal Mill Filling Fraction%Vol solids in slurry, fractionShoulder AngleShoulder AngleFractional Porosity of chargeGriding media voidage occupied by slurrySlurry Pool Angle Overflow Mills(Conical) Length inside LinersTrunion RadiusCharge DensityExperimental Critical speedToe AngleToe AngleMill Rev per secondMean Time between toe and ShoulderInternal radiousMean radial PositionMean Time between Shoulder and ToeActive fraction of the chargeInner surface Radious of chargeParameterNo-Load PowerPower Draw due to motion of ChargePower draw of Cone End  Charge MotionGross PowerUSING MILLTRAJ ANGLES Di L φ ρₒ ρB Fb Ft ρp ϴs ϴs E U ϴto Ld rt ρc φc ϴt ϴt Nm tc rm ȓ tf β ri z P Pt Pc Pptm m % m Radians Degrees Radians m rt=rm/4 Radians Degrees rev/s m kW kW kW kWNew Liners 7.135 11.616 0.750 13.361 2.77 7.8 0.270 0.270 0.4574 0.815 47 0.4 1 3.394 0.8725 0.892 5.404 1.083 4.122 236 0.198 4.79 3.57 2.953 0.968 0.832 2.587 0.9 580 9251 308 12623New Liners 7.135 11.616 0.800 13.361 2.77 7.8 0.270 0.270 0.4574 0.815 47 0.4 1 3.394 0.8725 0.892 5.404 1.083 4.115 236 0.211 4.50 3.57 2.955 0.968 0.823 2.602 0.9 611 9877 326 13467New Liners 7.135 11.616 0.850 13.361 2.77 7.8 0.270 0.270 0.4574 0.815 47 0.4 1 3.394 0.8725 0.892 5.404 1.083 4.098 235 0.224 4.26 3.57 2.960 0.965 0.815 2.619 0.9 642 10455 341 142466 months worn Liner 7.225 11.746 0.750 13.491 2.77 7.8 0.270 0.270 0.4574 0.394 23 0.4 1 3.394 0.8725 0.903 5.404 1.083 4.122 236 0.197 4.14 3.61 2.854 0.841 0.831 2.419 0.9 600 8758 335 120566 months worn Liner 7.225 11.746 0.800 13.491 2.77 7.8 0.270 0.270 0.4574 0.492 28 0.4 1 3.394 0.8725 0.903 5.404 1.083 4.115 236 0.210 4.03 3.61 2.893 0.875 0.822 2.492 0.9 632 9650 353 132366 months worn Liner 7.225 11.746 0.850 13.491 2.77 7.8 0.270 0.270 0.4574 0.620 36 0.4 1 3.394 0.8725 0.903 5.404 1.083 4.098 235 0.223 4.00 3.61 2.942 0.915 0.814 2.574 0.9 665 10545 365 144111 year Worn Liners 7.275 11.806 0.750 13.551 2.77 7.8 0.270 0.270 0.4574 0.089 5 0.4 1 3.394 0.8725 0.909 5.404 1.083 4.122 236 0.196 3.65 3.64 2.721 0.714 0.837 2.211 0.9 611 7897 338 109871 year Worn Liners 7.275 11.806 0.800 13.551 2.77 7.8 0.270 0.270 0.4574 0.183 11 0.4 1 3.394 0.8725 0.909 5.404 1.083 4.115 236 0.209 3.58 3.64 2.778 0.756 0.826 2.313 0.9 644 8850 363 122531 year Worn Liners 7.275 11.806 0.850 13.551 2.77 7.8 0.270 0.270 0.4574 0.288 17 0.4 1 3.394 0.8725 0.909 5.404 1.083 4.098 235 0.222 3.54 3.64 2.838 0.798 0.816 2.413 0.9 677 9788 382 1349196   MODEL "C" FOR MILL POWER - MAGNETIC LINERSCopper Mine in North AmericaMill Internal Diameter Inside LinersCylindrical Length inside liners(Belly length)Fraction of Theoretical Critical SpeedCenter Line LentgthOre DensityBall densityBall Fractional mill fillingTotal Mill Filling Fraction%Vol solids in slurry, fractionShoulder AngleShoulder AngleFractional Porosity of chargeGriding media voidage occupied by slurrySlurry Pool Angle Overflow Mills(Conical) Length inside LinersTrunion RadiusCharge DensityExperimental Critical speedToe AngleToe AngleMill Rev per secondMean Time between toe and ShoulderInternal radiousMean radial PositionMean Time between Shoulder and ToeActive fraction of the chargeInner surface Radious of chargeParameterNo-Load PowerPower Draw due to motion of ChargePower draw of Cone End  Charge MotionGross PowerDi L φ ρₒ ρB Fb Ft ρp ϴs ϴs E U ϴto Ld rt ρc φc ϴt ϴt Nm tc rm ȓ tf β ri z P Pt Pc Pptm m % m Radians Degrees Radians m rt=rm/4 Radians Degrees rev/s m kW kW kW kWMaximum Lift 7.137 11.616 0.750 13.361 2.77 7.8 0.262 0.262 0.4574 0.760 44 0.4 1 3.394 0.8725 0.892 5.404 1.086 4.141 237 0.198 4.67 3.57 2.957 0.960 0.829 2.595 0.9 580 9018 299 12319MODEL "C" FOR MILL POWER - MAGNETIC LINERSCopper Mine in North AmericaMill Internal Diameter Inside LinersCylindrical Length inside liners(Belly length)Fraction of Theoretical Critical SpeedCenter Line LentgthOre DensityBall densityBall Fractional mill fillingTotal Mill Filling Fraction%Vol solids in slurry, fractionShoulder AngleShoulder AngleFractional Porosity of chargeGriding media voidage occupied by slurrySlurry Pool Angle Overflow Mills(Conical) Length inside LinersTrunion RadiusCharge DensityExperimental Critical speedToe AngleToe AngleMill Rev per secondMean Time between toe and ShoulderInternal radiousMean radial PositionMean Time between Shoulder and ToeActive fraction of the chargeInner surface Radious of chargeParameterNo-Load PowerPower Draw due to motion of ChargePower draw of Cone End  Charge MotionGross PowerUSING MILLTRAJ ANGLES Di L φ ρₒ ρB Fb Ft ρp ϴs ϴs E U ϴto Ld rt ρc φc ϴt ϴt Nm tc rm ȓ tf β ri z P Pt Pc Pptm m % m Radians Degrees Radians m rt=rm/4 Radians Degrees rev/s m kW kW kW kWMaximum Lift 7.137 11.616 0.750 13.361 2.77 7.8 0.270 0.270 0.4574 0.850 49 0.4 1 3.394 0.8725 0.892 5.404 1.083 4.122 236 0.198 4.84 3.57 2.963 0.977 0.832 2.601 0.9 580 9299 306 12681Maximum Lift 7.137 11.616 0.800 13.361 2.77 7.8 0.270 0.270 0.4574 0.965 55 0.4 1 3.394 0.8725 0.892 5.404 1.083 4.115 236 0.211 4.72 3.57 2.992 1.003 0.825 2.655 0.9 611 10034 315 13651Maximum Lift 7.137 11.616 0.850 13.361 2.77 7.8 0.270 0.270 0.4574 1.084 62 0.4 1 3.394 0.8725 0.892 5.404 1.083 4.098 235 0.224 4.64 3.57 3.022 1.023 0.819 2.706 0.9 643 10675 320 14496Minimun Lift 7.137 11.616 0.750 13.361 2.77 7.8 0.270 0.270 0.4574 0.108 6 0.4 1 3.394 0.8725 0.892 5.404 1.083 4.122 236 0.198 3.65 3.57 2.681 0.716 0.836 2.186 0.9 580 7477 323 10407Minimun Lift 7.137 11.616 0.800 13.361 2.77 7.8 0.270 0.270 0.4574 0.204 12 0.4 1 3.394 0.8725 0.892 5.404 1.083 4.115 236 0.211 3.58 3.57 2.736 0.758 0.825 2.285 0.9 611 8375 347 11601Minimun Lift 7.137 11.616 0.850 13.361 2.77 7.8 0.270 0.270 0.4574 0.297 17 0.4 1 3.394 0.8725 0.892 5.404 1.083 4.098 235 0.224 3.52 3.57 2.788 0.794 0.816 2.373 0.9 643 9210 364 1270697  Appendix 4: MillTraj® Simulations Copper Mine-North America: Steel Liner new and worn at 75% Critical speed     98  Copper Mine-North America: Steel Liner-6 months worn at variable Critical speed       99  Copper Mine-North America: Steel Liner-12 months worn at variable Critical speed           100  Copper Mine-North America: Steel Liner profiles  New Liner Profile  New Liner Profile Half Worn Liner Profile  Half Worn Liner Profile 101        End of Life Liner Profile  End of Life Liner Profile 102  Copper Mine-North America: Rubber Liner New and worn rubber Liner at 75% Critical speed    103   New Liner Profile  New Liner Profile Half Worn Liner Profile  Half Worn Liner Profile 104          End of Life Liner Profile  End of Life Liner Profile 105  Copper Mine-North America: 50% worn rubber Liner at 75, 80 and 85% Critical speed   Copper Mine-North America: 80% worn rubber Liner at 75, 80 and 85% Critical speed  106     107  Metallic Magnetic Liner Assumed profile   108     109      110  Metallic Magnetic Liner Assumed Liner Profile   111      112  Appendix 5: Mill Calculated Ratios from Plant 1 and 2 Mill Calculated Ratios - Plant 1    Date BM -1   kW-h/t  BM -1 TPD  BM - 2     kW-h/t Transfer Size (um) Float Feed  P80 (μm) Wio 1-Jan-14     15.47      19,730        15.50             5,000.00  185            26.10  2-Jan-14     17.56      17,270        17.63             5,000.00  154            26.38  3-Jan-14     16.71      17,873        16.94             5,000.00  174            27.04  4-Jan-14     18.04      16,725        18.06             5,000.00  186            30.44  5-Jan-14     18.38      16,496        18.39             5,000.00  178            30.21  6-Jan-14     18.52      16,383        18.44             5,000.00  169            29.45  7-Jan-14     11.53        7,630              -               5,000.00  191            19.80  8-Jan-14     12.00      25,124        11.90             5,000.00  229            23.11  9-Jan-14     16.56      18,032        16.42             5,000.00  175            26.90  10-Jan-14     18.34      15,826        18.32             5,000.00  157            27.91  11-Jan-14     19.41      14,293        19.35             5,000.00  167            30.73  12-Jan-14     19.96      15,187        19.99             5,000.00  154            30.02  13-Jan-14     17.89      15,501        17.91             5,000.00  165            28.12  14-Jan-14     18.13      16,623        18.09             5,000.00  171            29.06  15-Jan-14     17.45      17,281        17.45             5,000.00  171            28.00  16-Jan-14     16.96      17,805        16.96             5,000.00  161            26.24  17-Jan-14     17.42        8,264        17.45             5,000.00  152            26.00  18-Jan-14     20.36      14,829        20.30             5,000.00  148            29.87  19-Jan-14     19.56      15,409        19.59             5,000.00  148            28.68  20-Jan-14     17.81      16,943        17.79             5,000.00  160            27.43  113  Mill Calculated Ratios - Plant 1    Date BM -1   kW-h/t  BM -1 TPD  BM - 2     kW-h/t Transfer Size (um) Float Feed  P80 (μm) Wio 21-Jan-14     21.60      13,932        21.57             5,000.00  141            30.84  22-Jan-14     19.93      15,131        19.92             5,000.00  129            26.96  23-Jan-14     18.08      16,776        18.05             5,000.00  150            26.73  24-Jan-14     18.46      15,642        18.38             5,000.00  158            28.20  25-Jan-14     18.32      15,677        18.31             5,000.00  160            28.19  26-Jan-14     16.75      18,048        16.77             5,000.00  155            25.33  27-Jan-14     18.17      16,289        18.13             5,000.00  143            26.18  28-Jan-14     23.55        8,360        23.50             5,000.00  142            33.78  29-Jan-14     19.04      15,844        19.04             5,000.00  131            26.06  30-Jan-14     17.31      17,464        17.33             5,000.00  150            25.60  31-Jan-14     21.17      14,348        21.26             5,000.00  114            26.69  1-Feb-14     20.71      14,640        20.72             5,000.00  119            26.76  2-Feb-14     17.83      17,054        17.79             5,000.00  154            26.88  3-Feb-14     17.68      17,191        17.66             5,000.00  151            26.35  4-Feb-14     18.79      16,176        18.83             5,000.00  128            25.34  5-Feb-14     22.72      13,375        22.72             5,000.00  97            26.03  6-Feb-14     19.61      13,290        19.65             5,000.00  116            24.92  7-Feb-14     17.63      15,648        17.69             5,000.00  155            26.62  8-Feb-14     15.47      19,574        15.49             5,000.00  171            24.77  9-Feb-14     15.26      19,145        15.27             5,000.00  174            24.72  10-Feb-14     18.02      16,827        18.07             5,000.00  153            27.02  11-Feb-14     16.58      12,859        16.73             5,000.00  139            23.51  114  Mill Calculated Ratios - Plant 1    Date BM -1   kW-h/t  BM -1 TPD  BM - 2     kW-h/t Transfer Size (um) Float Feed  P80 (μm) Wio 12-Feb-14     18.92      16,037        18.93             5,000.00  140            26.89  13-Feb-14     19.65      13,849        19.66             5,000.00  136            27.42  14-Feb-14     18.15      16,688        18.19             5,000.00  156            27.49  15-Feb-14     18.16      16,672        18.11             5,000.00  174            29.42  16-Feb-14     16.71      18,148        16.68             5,000.00  177            27.43  17-Feb-14     17.48      17,287        17.50             5,000.00  161            27.01  18-Feb-14     16.64      18,283        16.64             5,000.00  175            27.13  19-Feb-14     17.47      17,382        17.50             5,000.00  170            27.97  20-Feb-14     17.63        6,932        18.12             5,000.00  129            23.90  21-Feb-14     16.71      11,062        16.79             5,000.00  179            27.58  22-Feb-14     17.49      17,377        17.47             5,000.00  178            28.77  23-Feb-14     20.81      14,567        20.81             5,000.00  134            28.79  24-Feb-14     20.56      13,305        20.86             5,000.00  137            28.88  25-Feb-14     19.08      14,398        19.48             5,000.00  130            25.93  26-Feb-14     18.52      16,009        18.76             5,000.00  137            25.93  27-Feb-14     19.47      15,434        19.46             5,000.00  130            26.42  28-Feb-14     21.03      11,956        21.03             5,000.00  118            26.99  1-Mar-14     18.55      16,355        18.52             5,000.00  120            24.02  2-Mar-14     18.18      16,695        18.19             5,000.00  107            22.08  3-Mar-14     18.71      16,195        18.62             5,000.00  121            24.39  4-Mar-14     16.21      18,689        16.17             5,000.00  161            25.10  5-Mar-14     16.16      18,503        16.25             5,000.00  163            25.14  115  Mill Calculated Ratios - Plant 1    Date BM -1   kW-h/t  BM -1 TPD  BM - 2     kW-h/t Transfer Size (um) Float Feed  P80 (μm) Wio 6-Mar-14     16.45      18,289        16.46             5,000.00  165            25.80  7-Mar-14     15.81      18,914        15.86             5,000.00  188            26.89  8-Mar-14     16.36      16,750        16.42             5,000.00  163            25.45  9-Mar-14     17.12      14,994        17.06             5,000.00  140            24.34  10-Mar-14     19.66        3,276        19.64             5,000.00  147            28.73  11-Mar-14           -                 -                -               5,000.00      12-Mar-14           -                 -                -               5,000.00      13-Mar-14           -                 -                -               5,000.00      14-Mar-14           -                 -          11.80             5,000.00  181   15-Mar-14           -                 -          13.84             5,000.00  167   16-Mar-14           -                 -          14.89             5,000.00  140   17-Mar-14           -                 -          15.32             5,000.00  159   18-Mar-14           -                 -          15.34             5,000.00  163   19-Mar-14           -                 -          14.48             5,000.00  171   20-Mar-14     11.59        4,650        18.88             5,000.00  154            17.41  21-Mar-14     19.14      15,813        19.18             5,000.00  134            26.52  22-Mar-14     17.32      17,460        17.37             5,000.00  153            25.95  23-Mar-14     17.84      16,783        17.84             5,000.00  142            25.59  24-Mar-14     18.18      16,635        18.28             5,000.00  147            26.58  25-Mar-14     17.29      17,417        17.45             5,000.00  143            24.84  26-Mar-14     18.64      16,255        18.63             5,000.00  150            27.63  27-Mar-14     18.58      16,329        18.63             5,000.00  162            28.85  116  Mill Calculated Ratios - Plant 1    Date BM -1   kW-h/t  BM -1 TPD  BM - 2     kW-h/t Transfer Size (um) Float Feed  P80 (μm) Wio 28-Mar-14     17.47      17,337        17.56             5,000.00  158            26.69  29-Mar-14     18.08      15,834        18.18             5,000.00  155            27.28  30-Mar-14     17.70      17,151        17.73             5,000.00  160            27.30  31-Mar-14     16.63      18,235        16.69             5,000.00  156            25.17  1-Apr-14     19.98      15,188        19.96             5,000.00  163            31.15  2-Apr-14     17.77      15,687        17.83             5,000.00  162            27.63  3-Apr-14     17.14      17,696        17.14             5,000.00  185            28.87  4-Apr-14     16.56      15,496        16.70             5,000.00  159            25.38  5-Apr-14     17.78      16,996        17.93             5,000.00  183            29.72  6-Apr-14     16.36      18,224        16.47             5,000.00  182            27.30  7-Apr-14     16.80      17,456        16.72             5,000.00  174            27.23  8-Apr-14     12.74           651        13.67             5,000.00  189            21.74  9-Apr-14     16.36      12,703        16.62             5,000.00  171            26.27  10-Apr-14     16.18      16,411        16.51             5,000.00  165            25.39  11-Apr-14     16.60      17,991        16.85             5,000.00  165            26.09  12-Apr-14     17.74      16,858        17.93             5,000.00  176            28.95  13-Apr-14     17.50      17,005        17.86             5,000.00  166            27.58  14-Apr-14     17.88      16,755        18.06             5,000.00  157            27.22  15-Apr-14     17.23      17,534        17.43             5,000.00  175            28.02  16-Apr-14     17.78      17,013        17.80             5,000.00  168            28.17  17-Apr-14     17.38      16,549        17.49             5,000.00  152            25.98  18-Apr-14     17.48      17,162        17.69             5,000.00  166            27.57  117  Mill Calculated Ratios - Plant 1    Date BM -1   kW-h/t  BM -1 TPD  BM - 2     kW-h/t Transfer Size (um) Float Feed  P80 (μm) Wio 19-Apr-14     17.87      16,764        18.04             5,000.00  167            28.25  20-Apr-14     18.81      14,212        19.06             5,000.00  167            29.69  21-Apr-14     18.19      16,545        18.43             5,000.00  163            28.36  22-Apr-14     17.59      15,474        17.49             5,000.00  168            27.95  23-Apr-14     16.67      18,287        16.62             5,000.00  187            28.28  24-Apr-14     19.45      15,444        19.63             5,000.00  136            27.12  25-Apr-14     16.04      18,600        16.32             5,000.00  163            25.00  26-Apr-14     17.14      17,540        17.38             5,000.00  161            26.50  27-Apr-14     16.94      17,769        17.08             5,000.00  152            25.29  28-Apr-14     17.66      16,214        17.83             5,000.00  137            24.79  29-Apr-14     15.69        6,233        16.79             5,000.00  139            22.25  30-Apr-14     20.14      15,064        20.28             5,000.00  102            23.79  1-May-14     20.62      14,237        20.85             5,000.00  130            27.97  2-May-14     18.40      16,353        18.53             5,000.00  170            29.37  3-May-14     17.90      16,556        18.31             5,000.00  160            27.56  4-May-14     19.54      14,543        19.62             5,000.00  133            26.88  5-May-14       8.44        5,342        14.53             5,000.00  190            14.47  6-May-14     16.75      17,630        16.91             5,000.00  170            26.72  7-May-14     16.34      16,907        16.43             5,000.00  195            28.39  8-May-14     16.47      12,911        16.88             5,000.00  175            26.83  9-May-14     16.92      17,737        16.96             5,000.00  184            28.39  10-May-14     16.57      17,797        16.70             5,000.00  143            23.82  118  Mill Calculated Ratios - Plant 1    Date BM -1   kW-h/t  BM -1 TPD  BM - 2     kW-h/t Transfer Size (um) Float Feed  P80 (μm) Wio 11-May-14     16.15      18,483        16.35             5,000.00  154            24.29  12-May-14     17.25      17,243        17.52             5,000.00  138            24.30  13-May-14     17.92      16,704        18.15             5,000.00  142            25.62  14-May-14     18.20      15,885        18.57             5,000.00  140            25.87  15-May-14     19.24        3,825        19.61             5,000.00  145            27.93  16-May-14     16.60        7,250        17.02             5,000.00  156            25.16  17-May-14     18.06      14,805        18.39             5,000.00  143            26.00  18-May-14     17.95      16,420        18.07             5,000.00  144            25.96  19-May-14     17.67      11,895        17.80             5,000.00  147            25.89  20-May-14     19.38      14,206        19.46             5,000.00  117            24.71  21-May-14     19.44      15,453        19.39             5,000.00  107            23.57  22-May-14     17.43      17,105        17.38             5,000.00  114            21.93  23-May-14     16.24      18,373        16.27             5,000.00  139            23.01  24-May-14     15.72      18,524        15.85             5,000.00  170            25.09  25-May-14     17.63      17,026        17.68             5,000.00  144            25.50  26-May-14     19.98      14,903        20.03             5,000.00  133            27.51  27-May-14     20.46      14,571        20.45             5,000.00  119            26.42  28-May-14     21.71      13,800        21.49             5,000.00  85            23.07  29-May-14           -                 -                -               5,000.00      30-May-14           -                 -          11.81             5,000.00  91   31-May-14           -                 -          14.72             5,000.00  121   1-Jun-14     13.57        3,535        13.93             5,000.00  159            20.82  119  Mill Calculated Ratios - Plant 1    Date BM -1   kW-h/t  BM -1 TPD  BM - 2     kW-h/t Transfer Size (um) Float Feed  P80 (μm) Wio 2-Jun-14     14.75      16,452        14.78             5,000.00  194            25.55  3-Jun-14     15.60      18,764        15.82             5,000.00  178            25.67  4-Jun-14     18.26      14,727        18.30             5,000.00  166            28.78  5-Jun-14     16.41      18,114        16.52             5,000.00  164            25.66  6-Jun-14     16.56      13,122        16.66             5,000.00  166            26.04  7-Jun-14     15.19      19,687        15.28             5,000.00  130            20.69  8-Jun-14     15.21      19,710        15.41             5,000.00  158            23.21  9-Jun-14     16.32      18,363        16.43             5,000.00  155            24.67  10-Jun-14     15.83      18,727        16.00             5,000.00  156            23.98  11-Jun-14     15.56      19,080        15.74             5,000.00  153            23.31  12-Jun-14     15.77      18,002        15.85             5,000.00  157            23.99  13-Jun-14     16.72      17,546        16.60             5,000.00  181            27.82  14-Jun-14     15.24      19,451        15.37             5,000.00  190            26.10  15-Jun-14     15.08      18,838        15.15             5,000.00  199            26.56  16-Jun-14     18.94      15,250        18.97             5,000.00  154            28.48  17-Jun-14     16.67      18,024        16.72             5,000.00  160            25.68  18-Jun-14     16.28      18,403        16.36             5,000.00  169            25.92  19-Jun-14     16.88      15,525        16.82             5,000.00  172            27.19  20-Jun-14     17.59      17,114        17.42             5,000.00  175            28.63  21-Jun-14     22.79      13,003        22.23             5,000.00  117            29.06  22-Jun-14     23.60      12,804        23.03             5,000.00  103            28.04  23-Jun-14     20.82      12,305        20.56             5,000.00  131            28.40  120  Mill Calculated Ratios - Plant 1    Date BM -1   kW-h/t  BM -1 TPD  BM - 2     kW-h/t Transfer Size (um) Float Feed  P80 (μm) Wio 24-Jun-14           -                 -                -               5,000.00      25-Jun-14     17.28        4,263        17.23             5,000.00  164            27.00  26-Jun-14     16.68      17,910        16.88             5,000.00  167            26.38  27-Jun-14     15.96      16,621        16.23             5,000.00  185            26.89  28-Jun-14     16.51      17,962        16.71             5,000.00  182            27.54  29-Jun-14     16.15      18,580        16.09             5,000.00  194            28.00  30-Jun-14     16.55      17,812        16.86             5,000.00  151            24.61  1-Jul-14     17.07      17,466        17.30             5,000.00  166            26.88  2-Jul-14     19.84      15,238        20.11             5,000.00  148            29.20  3-Jul-14     25.68        1,749        25.80             5,000.00  148            37.79  4-Jul-14     20.26        9,413        20.54             5,000.00  169            32.27  5-Jul-14     19.30      15,681        19.49             5,000.00  141            27.52  6-Jul-14     19.77      15,284        19.77             5,000.00  135            27.46  7-Jul-14     16.50      18,027        16.69             5,000.00  156            25.00  8-Jul-14     17.41      16,569        17.56             5,000.00  155            26.27  9-Jul-14     15.56      18,988        16.13             5,000.00  143            22.40  10-Jul-14     17.00      17,428        17.54             5,000.00  145            24.63  11-Jul-14     16.20      17,140        16.63             5,000.00  172            26.04  12-Jul-14     17.04      17,468        17.23             5,000.00  176            27.80  13-Jul-14     17.66      16,887        17.77             5,000.00  167            27.93  14-Jul-14     17.90      16,611        18.10             5,000.00  164            27.94  15-Jul-14           -                 -                -               5,000.00      121  Mill Calculated Ratios - Plant 1    Date BM -1   kW-h/t  BM -1 TPD  BM - 2     kW-h/t Transfer Size (um) Float Feed  P80 (μm) Wio 16-Jul-14           -                 -                -               5,000.00      17-Jul-14     19.32        9,445        19.20             5,000.00  165            30.35  18-Jul-14     19.30      12,385        19.16             5,000.00  165            30.30  19-Jul-14     18.89      15,771        18.69             5,000.00  139            26.69  20-Jul-14     18.86      15,918        18.36             5,000.00  154            28.40  21-Jul-14     17.34      17,209        16.70             5,000.00  159            26.64  22-Jul-14     17.31      17,146        16.40             5,000.00  164            27.02  23-Jul-14     17.86      15,480        17.83             5,000.00  158            27.27  24-Jul-14     18.16      13,140        17.88             5,000.00  168            28.80  25-Jul-14     16.37      11,292        16.10             5,000.00  163            25.47  26-Jul-14     15.20      19,647        15.20             5,000.00  157            23.19  27-Jul-14     16.77      17,692        16.85             5,000.00  154            25.22  28-Jul-14     14.46      20,303        14.56             5,000.00  175            23.57  29-Jul-14     15.46      19,061        15.34             5,000.00  175            25.14  30-Jul-14     17.62      14,299        17.50             5,000.00  164            27.57  31-Jul-14     16.45      18,000        16.51             5,000.00  167            26.06  1-Aug-14     16.20      18,123        16.30             5,000.00  168            25.73  2-Aug-14     16.93      17,320        16.99             5,000.00  167            26.81  3-Aug-14     17.77      16,852        17.63             5,000.00  164            27.77  4-Aug-14     17.32      17,076        17.47             5,000.00  167            27.41  5-Aug-14     15.94      18,489        15.86             5,000.00  192            27.50  6-Aug-14     17.99      14,794        18.00             5,000.00  165            28.27  122  Mill Calculated Ratios - Plant 1    Date BM -1   kW-h/t  BM -1 TPD  BM - 2     kW-h/t Transfer Size (um) Float Feed  P80 (μm) Wio 7-Aug-14     16.63      17,549        16.99             5,000.00  173            26.83  8-Aug-14     16.70      17,565        16.67             5,000.00  171            26.81  9-Aug-14     17.51      15,527        17.43             5,000.00  183            29.32  10-Aug-14     16.52      17,725        16.47             5,000.00  188            28.14  11-Aug-14     16.07      17,829        16.15             5,000.00  197            28.11  12-Aug-14     23.20        3,824        23.27             5,000.00  181            38.49  13-Aug-14     15.24      15,771        15.08             5,000.00  193            26.32  14-Aug-14     17.15      17,483        16.74             5,000.00  180            28.43  15-Aug-14     17.19      15,043        16.82             5,000.00  233            33.48  16-Aug-14     16.29      18,170        16.20             5,000.00  180            26.94  17-Aug-14     16.89      17,461        16.89             5,000.00  170            26.99  18-Aug-14     17.35      17,079        17.05             5,000.00  186            29.27  19-Aug-14     17.30      17,334        17.18             5,000.00  181            28.71  20-Aug-14     17.47      17,281        17.48             5,000.00  178            28.75  21-Aug-14     20.09      13,323        20.05             5,000.00  129            27.22  22-Aug-14     17.14      17,593        17.06             5,000.00  176            27.94  23-Aug-14     15.72      18,984        15.71             5,000.00  187            26.69  24-Aug-14     16.59      18,182        16.58             5,000.00  160            25.55  25-Aug-14     16.71      16,752        16.63             5,000.00  175            27.20  26-Aug-14     18.28      16,536        18.06             5,000.00  161            28.22  27-Aug-14     17.61      17,100        17.63             5,000.00  149            26.03  28-Aug-14     18.78      16,110        18.64             5,000.00  123            24.74  123  Mill Calculated Ratios - Plant 1    Date BM -1   kW-h/t  BM -1 TPD  BM - 2     kW-h/t Transfer Size (um) Float Feed  P80 (μm) Wio 29-Aug-14     21.98      13,693        21.84             5,000.00  104            26.25  30-Aug-14     18.42      16,016        18.57             5,000.00  129            24.87  31-Aug-14     18.79      15,978        18.72             5,000.00  113            23.51  1-Sep-14     20.44      14,742        20.47             5,000.00  112            25.46  2-Sep-14     19.81      15,210        19.86             5,000.00  132            27.16  3-Sep-14           -                34              -               5,000.00      4-Sep-14     17.16      16,696        17.04             5,000.00  162            26.64  5-Sep-14     17.04      17,629        17.09             5,000.00  162            26.44  6-Sep-14     17.32      15,407        17.30             5,000.00  158            26.52  7-Sep-14     17.18      17,559        17.06             5,000.00  172            27.66  8-Sep-14     14.97      20,108        14.93             5,000.00  194            25.99  9-Sep-14     16.81      17,967        16.57             5,000.00  195            29.30  10-Sep-14     16.67      12,311        16.49             5,000.00  155            25.18  11-Sep-14     17.61      17,375        17.50             5,000.00  145            25.53  12-Sep-14     17.23      17,797        17.07             5,000.00  164            26.91  13-Sep-14     18.01      17,091        17.69             5,000.00  167            28.50  14-Sep-14     17.88      13,599        17.67             5,000.00  180            29.56  15-Sep-14     23.10      13,027        22.99             5,000.00  180            38.23  16-Sep-14       8.97        4,823        18.68             5,000.00  143            12.93  17-Sep-14           -                 -          13.40             5,000.00  176                  -    18-Sep-14     12.73        6,394        17.36             5,000.00  174            20.64  19-Sep-14     17.07      17,654        16.95             5,000.00  172            27.45  124  Mill Calculated Ratios - Plant 1    Date BM -1   kW-h/t  BM -1 TPD  BM - 2     kW-h/t Transfer Size (um) Float Feed  P80 (μm) Wio 20-Sep-14     18.76      16,120        18.75             5,000.00  160            28.94  21-Sep-14     18.86      15,973        18.84             5,000.00  149            27.82  22-Sep-14     19.25      15,603        19.37             5,000.00  150            28.48  23-Sep-14     17.68      17,075        17.65             5,000.00  155            26.69  24-Sep-14     17.23      17,485        17.10             5,000.00  171            27.63  25-Sep-14     18.54      16,295        18.34             5,000.00  157            28.19  26-Sep-14     18.14      16,674        18.05             5,000.00  143            26.10  27-Sep-14     17.47      15,737        17.42             5,000.00  149            25.81  28-Sep-14     18.89      16,033        18.89             5,000.00  138            26.56  29-Sep-14     20.11      14,878        20.30             5,000.00  144            29.11  30-Sep-14     15.66      15,227        25.92             5,000.00  158            23.95  1-Oct-14     16.66      17,983        16.67             5,000.00  156            25.26  2-Oct-14     13.76        8,457        13.69             5,000.00  204            24.64  3-Oct-14     16.36      18,451        16.39             5,000.00  164            25.63  4-Oct-14     16.94      17,788        16.85             5,000.00  173            27.34  5-Oct-14     18.56      16,335        18.51             5,000.00  148            27.25  6-Oct-14     19.31      15,633        19.30             5,000.00  161            29.85  7-Oct-14     19.07      15,798        19.09             5,000.00  169            30.42  8-Oct-14     16.71      15,868        23.39             5,000.00  141            23.81  9-Oct-14     20.05      15,132        20.05             5,000.00  140            28.53  10-Oct-14     20.07      15,081        20.04             5,000.00  134            27.73  11-Oct-14     18.57      16,189        18.54             5,000.00  163            28.98  125  Mill Calculated Ratios - Plant 1    Date BM -1   kW-h/t  BM -1 TPD  BM - 2     kW-h/t Transfer Size (um) Float Feed  P80 (μm) Wio 12-Oct-14     17.31      17,484        17.11             5,000.00  170            27.66  13-Oct-14     17.02      17,386        16.91             5,000.00  191            29.20  14-Oct-14           -        18,116              -               5,000.00  212                  -    15-Oct-14           -                68              -               5,000.00      16-Oct-14           -                 -                -               5,000.00      17-Oct-14     17.37        1,584        17.25             5,000.00      18-Oct-14     15.73      19,295        15.57             5,000.00  185            26.47  19-Oct-14     16.77      14,500        16.65             5,000.00  194            29.12  20-Oct-14     15.37      19,482          7.99             5,000.00  198            26.99  21-Oct-14     19.22      15,876        19.09             5,000.00  161            29.77  22-Oct-14     23.73      12,857        23.73             5,000.00  105            28.39  23-Oct-14     18.88      15,868        18.94             5,000.00  153            28.35  24-Oct-14     16.63      18,072        16.66             5,000.00  189            28.39  25-Oct-14     18.50      16,285        18.34             5,000.00  172            29.75  26-Oct-14     17.02      16,913        16.92             5,000.00  185            28.63  27-Oct-14     17.55      17,236        17.48             5,000.00  170            28.09  28-Oct-14     17.19      17,613        16.85             5,000.00  183            28.73  29-Oct-14     15.03      19,910        14.87             5,000.00  208            27.24  30-Oct-14     17.61      17,214        17.49             5,000.00  183            29.50  31-Oct-14     15.24      16,654        15.07             5,000.00  209            27.72  1-Nov-14     14.60      20,224        14.51             5,000.00  217            27.19  2-Nov-14     15.23      19,635        14.93             5,000.00  211            27.81  126  Mill Calculated Ratios - Plant 1    Date BM -1   kW-h/t  BM -1 TPD  BM - 2     kW-h/t Transfer Size (um) Float Feed  P80 (μm) Wio 3-Nov-14     15.07      19,770        14.75             5,000.00  236            29.60  4-Nov-14     17.12        9,134        16.83             5,000.00  236            33.56  5-Nov-14     15.10      19,747        14.84             5,000.00  221            28.44  6-Nov-14     16.55      18,072        16.31             5,000.00  210            30.16  7-Nov-14     15.27      19,328        15.15             5,000.00  222            28.79  8-Nov-14     14.58      20,200        14.28             5,000.00  233            28.42  9-Nov-14     15.45      19,141        15.29             5,000.00  218            28.88  10-Nov-14     15.02      19,375        15.11             5,000.00  222            28.37  11-Nov-14     15.47      19,105        15.47             5,000.00  226            29.50  12-Nov-14     17.40      15,898        17.09             5,000.00  206            31.32  13-Nov-14     17.20      14,471        17.21             5,000.00  199            30.33  14-Nov-14     17.66      15,759        17.49             5,000.00  207            31.89  15-Nov-14     16.27      17,473        16.21             5,000.00  231            31.53  16-Nov-14     16.57      18,175        16.55             5,000.00  219            31.04  17-Nov-14     16.61      18,109        16.56             5,000.00  218            30.98  18-Nov-14     17.27      17,517        17.05             5,000.00  180            28.62  19-Nov-14     15.72      19,343        15.54             5,000.00  203            28.07  20-Nov-14     18.32      16,418        18.18             5,000.00  181            30.42  21-Nov-14     17.48      17,336        17.27             5,000.00  191            29.99  22-Nov-14     17.57      17,247        17.57             5,000.00  185            29.61  23-Nov-14     16.05      18,849        15.90             5,000.00  208            29.06  24-Nov-14     15.57      19,346        15.41             5,000.00  216            28.90  127  Mill Calculated Ratios - Plant 1    Date BM -1   kW-h/t  BM -1 TPD  BM - 2     kW-h/t Transfer Size (um) Float Feed  P80 (μm) Wio 25-Nov-14           -                68              -               5,000.00      26-Nov-14           -                 -                -               5,000.00      27-Nov-14     16.15      11,611        16.01             5,000.00  208            29.24  28-Nov-14     23.39      13,012        23.44             5,000.00  139            33.15  29-Nov-14     26.84      11,337        26.85             5,000.00  117            34.28  30-Nov-14     20.08      13,401        20.07             5,000.00  165            31.47  1-Dec-14     17.06      17,843        17.07             5,000.00  185            28.69  2-Dec-14     16.93      17,995        16.85             5,000.00  201            30.06  3-Dec-14     15.70      19,295        15.71             5,000.00  220            29.47  4-Dec-14     15.44      19,475        15.46             5,000.00  226            29.47  5-Dec-14     15.01      20,084        14.77             5,000.00  248            30.44  6-Dec-14     15.89      18,913        15.73             5,000.00  221            29.88  7-Dec-14     16.79      18,203        16.77             5,000.00  190            28.71  8-Dec-14     18.49      15,942        18.46             5,000.00  171            29.65  9-Dec-14     15.76      19,164        15.81             5,000.00  223            29.80  10-Dec-14     20.27        8,180        20.02             5,000.00  173            32.77  11-Dec-14           -                 -                -               5,000.00      12-Dec-14           -          1,837              -               5,000.00  131                  -    13-Dec-14     16.32      18,223        16.36             5,000.00  190            27.93  14-Dec-14     15.12      20,093        15.09             5,000.00  213            27.85  15-Dec-14     17.02      17,762        17.08             5,000.00  182            28.42  16-Dec-14           -                  9              -               5,000.00      128  Mill Calculated Ratios - Plant 1    Date BM -1   kW-h/t  BM -1 TPD  BM - 2     kW-h/t Transfer Size (um) Float Feed  P80 (μm) Wio 17-Dec-14           -                 -          10.71             5,000.00  287                  -    18-Dec-14     16.90      16,180        17.03             5,000.00  224            32.05  19-Dec-14     16.01      15,653        16.05             5,000.00  230            30.90  20-Dec-14     16.04      18,843        16.10             5,000.00  222            30.32  21-Dec-14     16.22      18,582        16.34             5,000.00  225            30.87  22-Dec-14     14.85      19,926        15.24             5,000.00  235            29.06  23-Dec-14     15.07      20,022        15.21             5,000.00  238            29.70  24-Dec-14     15.60      19,017        15.99             5,000.00  232            30.25  25-Dec-14     15.53      19,295        15.65             5,000.00  246            31.28  26-Dec-14     16.09      16,258        16.21             5,000.00  239            31.86  27-Dec-14     14.71      20,102        14.84             5,000.00  266            31.20  28-Dec-14     15.39      19,480        15.55             5,000.00  251            31.39  29-Dec-14     17.69      17,116        17.78             5,000.00  205            31.73  30-Dec-14     21.23      14,273        21.20             5,000.00  152            31.68  31-Dec-14     18.04      15,933        18.17             5,000.00  189            30.79  1-Jan-15     15.31      19,405        15.53             5,000.00  235            29.99  2-Jan-15     15.39      19,276        15.65             6,000.00  219            28.15  3-Jan-15     18.44      16,355        18.56             6,000.00  191            30.96  4-Jan-15     15.17      19,747        15.30             6,000.00  240            29.41  5-Jan-15     15.11      19,870        15.18             6,000.00  240            29.29  6-Jan-15     15.47      19,525        15.48             6,000.00  241            30.01  7-Jan-15     15.81      19,061        15.80             6,000.00  227            29.58  129  Mill Calculated Ratios - Plant 1    Date BM -1   kW-h/t  BM -1 TPD  BM - 2     kW-h/t Transfer Size (um) Float Feed  P80 (μm) Wio 8-Jan-15           -                42              -               6,000.00      9-Jan-15     14.90      19,963        15.10             6,000.00  237            28.62  10-Jan-15     15.02      19,666        15.33             6,000.00  232            28.50  11-Jan-15     14.47      20,348        14.59             6,000.00  247            28.56  12-Jan-15     14.40      20,530        14.65             6,000.00  260            29.31  13-Jan-15     14.93      19,878        15.14             6,000.00  232            28.34  14-Jan-15     16.92      17,546        17.30             6,000.00  200            29.27  15-Jan-15     15.17      19,102        15.36             6,000.00  256            30.58  16-Jan-15     14.35      20,745        14.48             6,000.00  237            27.56  17-Jan-15     14.61      20,365        14.93             6,000.00  256            29.43  18-Jan-15     14.83      20,064        15.01             6,000.00  241            28.82  19-Jan-15     14.43      20,655        14.70             6,000.00  232            27.38  20-Jan-15     14.31      20,731        14.57             6,000.00  234            27.27  21-Jan-15     13.65      21,628        13.97             6,000.00  259            27.73  22-Jan-15     17.12      17,501        17.41             6,000.00  213            30.80  23-Jan-15     16.69      17,912        16.95             6,000.00  205            29.30  24-Jan-15     16.19      12,388        16.58             6,000.00  246            31.81  25-Jan-15     15.37      18,955        15.61             6,000.00  229            28.93  26-Jan-15     15.05      19,729        15.35             6,000.00  265            31.04  27-Jan-15           -             194        13.21             6,000.00  151                  -    28-Jan-15       5.90      11,728        12.99             6,000.00  226            11.02  29-Jan-15     11.65      25,502              -               6,000.00  266            24.05  130  Mill Calculated Ratios - Plant 1    Date BM -1   kW-h/t  BM -1 TPD  BM - 2     kW-h/t Transfer Size (um) Float Feed  P80 (μm) Wio 30-Jan-15     11.42      26,051              -               6,000.00  263            23.43  31-Jan-15     12.21      24,594              -               6,000.00  274            25.69  1-Feb-15     11.95      25,072              -               6,000.00  272            25.03  2-Feb-15     11.87      17,837              -               6,000.00  279            25.27  3-Feb-15     11.90      25,360              -               6,000.00  265            24.55  4-Feb-15     15.65      18,652        15.75             6,000.00  212            28.08  5-Feb-15     16.94      17,855        17.07             6,000.00  224            31.44  6-Feb-15     16.22      18,700        16.26             6,000.00  220            29.71  7-Feb-15     17.95      16,307        17.97             6,000.00  203            31.37  8-Feb-15     17.52      15,150        17.42             6,000.00  234            33.41  9-Feb-15     15.82      17,277        15.80             6,000.00  243            30.88  10-Feb-15     15.12      20,079        15.13             6,000.00  229            28.45  11-Feb-15     15.38      19,669        15.31             6,000.00  229            28.92  12-Feb-15       7.72        5,417        14.71             6,000.00  212            13.87  13-Feb-15     18.05      16,812        17.97             6,000.00  188            30.11  14-Feb-15     15.43      19,661        15.47             6,000.00  224            28.64  15-Feb-15     18.29      16,694        18.16             6,000.00  197            31.30  16-Feb-15     16.28      17,222        16.10             6,000.00  194            27.61  17-Feb-15     16.09      18,842        16.08             6,000.00  222            29.67  18-Feb-15     17.21      17,630        17.27             6,000.00  203            30.09  19-Feb-15     19.62      15,396        19.60             6,000.00  159            29.57  20-Feb-15     17.20      17,606        17.17             6,000.00  184            28.25  131  Mill Calculated Ratios - Plant 1    Date BM -1   kW-h/t  BM -1 TPD  BM - 2     kW-h/t Transfer Size (um) Float Feed  P80 (μm) Wio 21-Feb-15     16.28      18,704        16.49             6,000.00  198            27.95  22-Feb-15     15.72      19,455        15.84             6,000.00  225            29.28  23-Feb-15     14.62      20,956        14.62             6,000.00  254            29.34  24-Feb-15     16.64      18,219        16.71             6,000.00  195            28.33  25-Feb-15     17.80      17,042        17.73             6,000.00  160            26.95  26-Feb-15     17.20      15,922        17.13             6,000.00  175            27.41  27-Feb-15     18.46      16,396        18.53             6,000.00  175            29.42  28-Feb-15     15.78      19,160        15.85             6,000.00  222            29.08  1-Mar-15     15.16      20,094        15.15             6,000.00  231            28.70  2-Mar-15     16.04      19,100        16.00             6,000.00  223            29.66  3-Mar-15           -                 -                -               6,000.00      4-Mar-15     20.87        8,353        19.23             6,000.00  120            26.66  5-Mar-15     20.79      13,652        20.81             6,000.00  138            28.78  6-Mar-15     17.79      16,995        17.84             6,000.00  164            27.34  7-Mar-15     18.98      15,333        18.96             6,000.00  166            29.33  8-Mar-15     19.69      15,539        19.57             6,000.00  128            26.09  9-Mar-15     18.75      16,284        18.55             6,000.00  137            25.86  10-Mar-15     20.02      15,240        19.80             6,000.00  126            26.27  11-Mar-15     18.80      16,044        18.73             6,000.00  155            27.91  12-Mar-15     18.88      15,963        18.98             6,000.00  168            29.37  13-Mar-15     19.62      14,777        19.79             6,000.00  176            31.40  14-Mar-15     18.91      15,828        19.00             6,000.00  155            28.05  132  Mill Calculated Ratios - Plant 1    Date BM -1   kW-h/t  BM -1 TPD  BM - 2     kW-h/t Transfer Size (um) Float Feed  P80 (μm) Wio 15-Mar-15     19.38      15,479        19.35             6,000.00  150            28.16  16-Mar-15     18.73      15,870        18.90             6,000.00  167            29.00  17-Mar-15     17.70      16,965        17.54             6,000.00  190            29.69  18-Mar-15     17.50      17,348        17.27             6,000.00  202            30.46  19-Mar-15     17.41      17,507        17.06             6,000.00  194            29.60  20-Mar-15     19.28        8,437        18.71             6,000.00  234            36.72  21-Mar-15     16.66      18,193        16.36             6,000.00  206            29.38  22-Mar-15     14.95      19,885        14.76             6,000.00  216            27.12  23-Mar-15     15.15      19,408        15.01             6,000.00  232            28.74  24-Mar-15     14.53      20,337        14.27             6,000.00  233            27.63  25-Mar-15     19.80      15,310        19.26             6,000.00  164            30.35  26-Mar-15     17.30      13,602        16.90             6,000.00  189            28.91  27-Mar-15     16.29      18,507        15.75             6,000.00  227            30.51  28-Mar-15     15.21      19,668        14.79             6,000.00  228            28.57  29-Mar-15     15.18      19,463        14.73             6,000.00  230            28.66  30-Mar-15     16.33      18,331        15.84             6,000.00  216            29.62  31-Mar-15     14.98      20,051        14.45             6,000.00  230            28.22  1-Apr-15           -                 -                -               6,000.00      2-Apr-15     14.54      16,418        14.20             6,000.00  212            26.05  3-Apr-15     14.32      20,983        13.97             6,000.00  240            27.72  4-Apr-15     14.88      20,334        14.57             6,000.00  243            29.03  5-Apr-15     13.61      21,892        13.53             6,000.00  245            26.71  133  Mill Calculated Ratios - Plant 1    Date BM -1   kW-h/t  BM -1 TPD  BM - 2     kW-h/t Transfer Size (um) Float Feed  P80 (μm) Wio 6-Apr-15     13.06      22,761        13.04             6,000.00  265            26.90  7-Apr-15     13.11      22,820        12.98             6,000.00  265            26.99  8-Apr-15     14.54      17,397        14.42             6,000.00  219            26.58  9-Apr-15     14.49      20,515        14.23             6,000.00  214            26.15  10-Apr-15     15.17      16,299        14.96             6,000.00  233            28.85  11-Apr-15     13.58      21,967        13.46             6,000.00  265            28.02  12-Apr-15     13.92      21,495        13.76             6,000.00  272            29.16  13-Apr-15     14.70      20,246        14.81             6,000.00  242            28.65  14-Apr-15     15.16      18,315        15.07             6,000.00  220            27.85  15-Apr-15     15.55      17,321        15.43             6,000.00  202            27.06  16-Apr-15     15.57      19,120        15.54             6,000.00  185            25.72  17-Apr-15     17.25      17,427        17.25             6,000.00  177            27.69  18-Apr-15     15.33      19,416        15.36             6,000.00  174            24.39  19-Apr-15     15.63      19,298        15.41             6,000.00  220            28.65  20-Apr-15     15.51      19,393        15.41             6,000.00  187            25.73  21-Apr-15     15.00      19,921        14.95             6,000.00  221            27.57  22-Apr-15     14.59      20,511        14.47             6,000.00  214            26.29  23-Apr-15     20.13      14,185        20.05             6,000.00  161            30.55  24-Apr-15     15.97      18,847        15.89             6,000.00  197            27.35  25-Apr-15     15.44      19,425        15.31             6,000.00  207            27.31  26-Apr-15     14.44      20,773        14.37             6,000.00  235            27.61  27-Apr-15     14.77      20,181        14.84             6,000.00  230            27.85  134  Mill Calculated Ratios - Plant 1    Date BM -1   kW-h/t  BM -1 TPD  BM - 2     kW-h/t Transfer Size (um) Float Feed  P80 (μm) Wio 28-Apr-15           -                 -                -               6,000.00      29-Apr-15     14.07        5,310        14.03             6,000.00  239            27.16  30-Apr-15     14.02      21,393        13.93             6,000.00  229            26.35  1-May-15     15.73      16,130        15.72             6,000.00  216            28.53  2-May-15     14.33      20,711        14.38             6,000.00  213            25.74  3-May-15     15.03      19,891        15.05             6,000.00  227            28.09  4-May-15     14.83      20,095        14.90             6,000.00  209            26.34  5-May-15     14.92      19,937        14.95             6,000.00  233            28.39  6-May-15     16.59      18,046        16.85             6,000.00  201            28.79  7-May-15     15.30      19,498        15.56             6,000.00  209            27.16  8-May-15     18.43      16,294        18.47             6,000.00  176            29.52  9-May-15     21.42      14,108        21.61             6,000.00  120            27.29  10-May-15     20.75      14,580        20.81             6,000.00  131            27.89  11-May-15     18.29      16,454        18.41             6,000.00  178            29.49  12-May-15     14.69      20,605        14.87             6,000.00  225            27.31  13-May-15     18.43      16,515        18.44             6,000.00  155            27.37  14-May-15     19.32      15,676        19.31             6,000.00  170            30.29  15-May-15     15.08      19,956        15.25             6,000.00  220            27.67  16-May-15     15.40      17,516        15.33             6,000.00  237            29.60  17-May-15     15.27      19,350        15.28             6,000.00  258            30.97  18-May-15     15.23      16,510        15.20             6,000.00  209            27.06  19-May-15     14.49      21,198        14.47             6,000.00  245            28.40  135  Mill Calculated Ratios - Plant 1    Date BM -1   kW-h/t  BM -1 TPD  BM - 2     kW-h/t Transfer Size (um) Float Feed  P80 (μm) Wio 20-May-15     15.73      19,384        15.76             6,000.00  233            29.91  21-May-15     15.34      19,662        15.43             6,000.00  236            29.36  22-May-15     16.46      18,345        16.48             6,000.00  265            33.95  23-May-15     15.01      20,050        15.05             6,000.00  235            28.65  24-May-15     13.80      21,720        13.90             6,000.00  217            25.11  25-May-15     13.57      19,525        13.58             6,000.00  248            26.82  26-May-15     14.42      20,807        14.46             6,000.00  228            27.08  27-May-15     17.79      17,000        17.75             6,000.00  164            27.33  28-May-15     16.62      18,110        16.61             6,000.00  189            27.74  29-May-15     13.51      22,098        13.54             6,000.00  229            25.40  30-May-15     18.64      13,695        18.63             6,000.00  174            29.66  31-May-15     16.37      18,310        16.39             6,000.00  183            26.81  1-Jun-15     14.32      20,964        14.34             6,000.00  206            25.24  2-Jun-15           -                 -                -               6,000.00      3-Jun-15           -                 -                -               6,000.00      4-Jun-15     17.23      14,503        17.15             6,000.00  193            29.18  5-Jun-15     18.56      16,290        18.62             6,000.00  175            29.64  6-Jun-15     18.30      14,477        18.37             6,000.00  176            29.26  7-Jun-15     17.19      17,496        17.32             6,000.00  184            28.26  8-Jun-15     16.56      18,152        16.52             6,000.00  197            28.38  9-Jun-15     16.54      18,006        16.60             6,000.00  208            29.33  10-Jun-15     17.46      15,664        17.45             6,000.00  173            27.66  136  Mill Calculated Ratios - Plant 1    Date BM -1   kW-h/t  BM -1 TPD  BM - 2     kW-h/t Transfer Size (um) Float Feed  P80 (μm) Wio 11-Jun-15     15.98      18,665        15.84             6,000.00  222            29.45  12-Jun-15     17.11      17,789        17.02             6,000.00  190            28.74  13-Jun-15     16.08      18,782        16.11             6,000.00  212            28.87  14-Jun-15     16.83      17,923        16.77             6,000.00  209            29.91  15-Jun-15     15.87      19,085        15.80             6,000.00  222            29.32  16-Jun-15     14.13      21,344        14.12             6,000.00  233            26.85  17-Jun-15     14.52      20,526        14.62             6,000.00  231            27.47  18-Jun-15     14.54      20,784        14.48             6,000.00  218            26.54  19-Jun-15     17.12      17,853        17.07             6,000.00  185            28.27  20-Jun-15     15.74      19,443        15.70             6,000.00  234            29.97  21-Jun-15     14.46      21,177        14.42             6,000.00  230            27.27  22-Jun-15     14.46      21,069        14.43             6,000.00  232            27.42  23-Jun-15     15.73      15,245        15.72             6,000.00  171            24.76  24-Jun-15     15.31      19,429        15.24             6,000.00  208            27.09  25-Jun-15     15.26      18,402        15.18             6,000.00  210            27.24  26-Jun-15     14.29      21,156        14.28             6,000.00  230            26.92  27-Jun-15     15.23      19,831        15.23             6,000.00  213            27.41  28-Jun-15     14.29      21,303        14.26             6,000.00  226            26.68  29-Jun-15     16.04      18,942        16.06             6,000.00  205            28.21  30-Jun-15     19.12      12,508        19.04             6,000.00  193            32.37  1-Jul-15     15.66      19,391        15.65             6,000.00  160            23.71  2-Jul-15     14.56      20,881        14.52             6,000.00  211            26.04  137  Mill Calculated Ratios - Plant 1    Date BM -1   kW-h/t  BM -1 TPD  BM - 2     kW-h/t Transfer Size (um) Float Feed  P80 (μm) Wio 3-Jul-15     14.77      20,607        14.65             6,000.00  219            26.99  4-Jul-15     14.69      20,632        14.64             6,000.00  219            26.86  5-Jul-15     15.36      19,749        15.31             6,000.00  215            27.75  6-Jul-15     15.69      17,625        15.66             6,000.00  215            28.38  7-Jul-15     13.76        5,512        13.70             6,000.00  207            24.32  8-Jul-15     16.50      18,035        16.45             6,000.00  182            27.00  9-Jul-15     15.28      19,260        15.15             6,000.00  188            25.48  10-Jul-15     16.17      18,685        16.10             6,000.00  176            25.86  11-Jul-15     15.24      19,836        15.26             6,000.00  192            25.74  12-Jul-15     15.40      19,740        15.34             6,000.00  192            26.01  13-Jul-15     16.91      17,301        16.84             6,000.00  187            28.04  14-Jul-15     15.06      20,205        15.09             6,000.00  191            25.30  15-Jul-15     14.88      20,420        14.89             6,000.00  205            26.12  16-Jul-15     14.84      20,608        14.80             6,000.00  222            27.38  17-Jul-15     15.62      19,484        15.54             6,000.00  214            28.16  18-Jul-15     13.95      21,867        13.85             6,000.00  246            27.42  19-Jul-15     14.06      21,756        13.88             6,000.00  256            28.34  20-Jul-15     13.94      21,782        13.86             6,000.00  251            27.73  21-Jul-15     14.79      20,586        14.74             6,000.00  221            27.19  22-Jul-15     14.48      19,364        14.38             6,000.00  221            26.65  23-Jul-15     14.77      20,506        14.81             6,000.00  222            27.25  24-Jul-15     14.91      20,444        14.89             6,000.00  216            27.02  138  Mill Calculated Ratios - Plant 1    Date BM -1   kW-h/t  BM -1 TPD  BM - 2     kW-h/t Transfer Size (um) Float Feed  P80 (μm) Wio 25-Jul-15     14.84      20,600        14.72             6,000.00  214            26.79  26-Jul-15     14.87      20,526        14.83             6,000.00  211            26.56  27-Jul-15     15.75      19,361        15.74             6,000.00  194            26.80  28-Jul-15     15.15      20,139        15.08             6,000.00  195            25.83  29-Jul-15     15.70      19,418        15.66             6,000.00  190            26.35  30-Jul-15     14.53      21,041        14.47             6,000.00  221            26.76  31-Jul-15     13.75      22,307        13.74             6,000.00  240            26.59  1-Aug-15     14.79      20,558        14.76             6,000.00  213            26.56  2-Aug-15     15.05      20,188        15.05             6,000.00  230            28.35  3-Aug-15     15.00      20,261        14.91             6,000.00  185            24.76  4-Aug-15     14.11      21,492        14.15             6,000.00  218            25.72  5-Aug-15     15.57      19,631        15.57             6,000.00  204            27.31  6-Aug-15     17.46      17,481        17.42             6,000.00  173            27.69  7-Aug-15     16.33      18,698        16.28             6,000.00  180            26.52  8-Aug-15     15.16      17,620        15.09             6,000.00  196            25.93  9-Aug-15     15.49      19,606        15.50             6,000.00  194            26.31  10-Aug-15     16.41      18,525        16.36             6,000.00  211            29.30  11-Aug-15           -                 -                -               6,000.00      12-Aug-15     14.79      16,600        14.70             6,000.00  194            25.08  13-Aug-15     14.97      20,525        14.97             6,000.00  195            25.53  14-Aug-15     14.42      19,226        14.37             6,000.00  200            24.93  15-Aug-15     14.44      21,237        14.40             6,000.00  206            25.45  139  Mill Calculated Ratios - Plant 1    Date BM -1   kW-h/t  BM -1 TPD  BM - 2     kW-h/t Transfer Size (um) Float Feed  P80 (μm) Wio 16-Aug-15     14.25      21,465        14.24             6,000.00  217            25.90  17-Aug-15     14.23      21,433        14.19             6,000.00  217            25.89  18-Aug-15     16.33      18,648        16.27             6,000.00  194            27.70  19-Aug-15     16.05      18,952        16.06             6,000.00  175            25.57  20-Aug-15     14.62      18,357        14.67             6,000.00  187            24.26  21-Aug-15     13.55      22,490        13.54             6,000.00  214            24.45  22-Aug-15     13.60      22,461        13.58             6,000.00  224            25.23  23-Aug-15     14.90      20,518        14.85             6,000.00  199            25.70  24-Aug-15     15.73      19,333        19.97             6,000.00  179            25.43  25-Aug-15     14.25      21,384        14.24             6,000.00  200            24.63  26-Aug-15     14.92      20,379        14.92             6,000.00  177            23.98  27-Aug-15     18.79      16,263        18.75             6,000.00  148            27.15  28-Aug-15     20.48      14,821        20.42             6,000.00  156            30.50  29-Aug-15     15.20      20,104        15.24             6,000.00  195            25.93  30-Aug-15     15.25      20,015        15.27             6,000.00  188            25.45  31-Aug-15     15.48      19,762        15.53             6,000.00  189            25.87  1-Sep-15     14.67      19,473        14.61             6,000.00  221            26.96  2-Sep-15     14.92      17,167        14.94             6,000.00  212            26.76  3-Sep-15     14.54      20,895        14.57             6,000.00  212            26.08  4-Sep-15     14.32      21,207        14.28             6,000.00  208            25.37  5-Sep-15     16.14      15,843        15.98             6,000.00  209            28.68  6-Sep-15     14.85      15,564        14.82             6,000.00  206            26.14  140  Mill Calculated Ratios - Plant 1    Date BM -1   kW-h/t  BM -1 TPD  BM - 2     kW-h/t Transfer Size (um) Float Feed  P80 (μm) Wio 7-Sep-15     15.28      19,909        15.27             6,000.00  213            27.50  8-Sep-15     13.91      21,705        13.93             6,000.00  221            25.57  9-Sep-15     13.76      22,059        13.72             6,000.00  241            26.73  10-Sep-15     14.30      21,136        14.28             6,000.00  217            26.05  11-Sep-15     14.56      17,316        14.64             6,000.00  199            25.08  12-Sep-15           -                 -                -               6,000.00      13-Sep-15     14.83      10,868        14.77             6,000.00  209            26.39  14-Sep-15     14.64      20,719        14.65             6,000.00  214            26.44  15-Sep-15     15.03      15,932        15.04             6,000.00  204            26.33  16-Sep-15     14.64      20,767        14.67             6,000.00  216            26.56  17-Sep-15     15.71      19,310        15.77             6,000.00  196            26.84  18-Sep-15     23.79        3,587        23.71             6,000.00  91            25.83  19-Sep-15     16.40      18,489        16.44             6,000.00  177            26.37  20-Sep-15     16.09      18,900        16.16             6,000.00  185            26.53  21-Sep-15     14.84      20,494        14.88             6,000.00  192            25.06  22-Sep-15     15.29      19,790        15.35             6,000.00  185            25.26  23-Sep-15     16.27      18,735        16.22             6,000.00  179            26.30  24-Sep-15     16.63      18,004        16.60             6,000.00  173            26.38  25-Sep-15     15.61      19,475        15.65             6,000.00  188            25.99  26-Sep-15     14.82      20,476        14.84             6,000.00  200            25.60  27-Sep-15     14.91      20,427        14.92             6,000.00  192            25.14  28-Sep-15     16.65      18,316        16.64             6,000.00  179            26.89  141  Mill Calculated Ratios - Plant 1    Date BM -1   kW-h/t  BM -1 TPD  BM - 2     kW-h/t Transfer Size (um) Float Feed  P80 (μm) Wio 29-Sep-15     16.12      18,872        16.13             6,000.00  186            26.66  30-Sep-15     20.42      14,864        20.50             6,000.00  136            28.03  1-Oct-15           -                 -                -               6,000.00      2-Oct-15           -                 -                -               6,000.00      3-Oct-15     17.50      16,406        17.48             6,000.00  166            27.08  4-Oct-15     16.78      18,111        16.81             6,000.00  170            26.30  5-Oct-15     15.55      19,479        15.59             6,000.00  199            26.82  6-Oct-15     15.23      14,755        15.26             6,000.00  189            25.41  7-Oct-15     15.34      17,322        15.34             6,000.00  229            28.87  8-Oct-15     16.18      18,846        16.18             6,000.00  199            27.92  9-Oct-15     14.68      20,753        14.65             6,000.00  201            25.48  10-Oct-15     14.84      20,512        14.87             6,000.00  194            25.23  11-Oct-15     15.00      20,289        14.99             6,000.00  201            26.02  12-Oct-15     15.65      19,445        15.63             6,000.00  204            27.39  13-Oct-15     15.43      19,703        15.40             6,000.00  215            27.93  14-Oct-15     15.50      19,594        15.50             6,000.00  184            25.52  15-Oct-15     15.85      19,163        15.93             6,000.00  198            27.24  16-Oct-15     15.81      19,357        15.70             6,000.00  197            27.08  17-Oct-15     15.17      20,054        15.14             6,000.00  199            26.14  18-Oct-15     15.06      20,169        15.05             6,000.00  207            26.58  19-Oct-15     14.88      20,367        14.94             6,000.00  200            25.74  20-Oct-15     16.73      18,131        16.79             6,000.00  171            26.32  142  Mill Calculated Ratios - Plant 1    Date BM -1   kW-h/t  BM -1 TPD  BM - 2     kW-h/t Transfer Size (um) Float Feed  P80 (μm) Wio 21-Oct-15     19.19      15,844        19.09             6,000.00  152            28.15  22-Oct-15     23.12      11,211        23.11             6,000.00  117            29.12  23-Oct-15     18.65      16,303        18.60             6,000.00  161            28.32  24-Oct-15     15.81      19,258        15.79             6,000.00  171            24.84  25-Oct-15     14.90      20,342        14.94             6,000.00  167            23.09  26-Oct-15     15.60      19,497        15.63             6,000.00  177            25.06  27-Oct-15     15.13      20,085        15.14             6,000.00  198            26.00  28-Oct-15     15.12      20,070        15.17             6,000.00  190            25.38  29-Oct-15     14.88      20,407        14.90             6,000.00  198            25.55  30-Oct-15     15.50      19,619        15.48             6,000.00  190            26.01  31-Oct-15     16.27      19,532        16.22             6,000.00  196            27.77  1-Nov-15     15.23      19,974        15.24             6,000.00  198            26.19  2-Nov-15     18.15      16,799        18.12             6,000.00  176            29.05  3-Nov-15           -             685              -               6,000.00  155                  -    4-Nov-15     18.90      16,040        18.85             6,000.00  141            26.50  5-Nov-15     19.22      15,745        19.15             6,000.00  141            26.93  6-Nov-15     18.18      16,637        18.27             6,000.00  150            26.47  7-Nov-15     17.16      17,588        17.22             6,000.00  159            25.83  8-Nov-15     17.49      17,399        17.44             6,000.00  170            27.45  9-Nov-15     18.01      11,546        17.91             6,000.00  163            27.55  10-Nov-15     17.00      17,917        16.96             6,000.00  168            26.50  11-Nov-15     17.88      17,059        17.85             6,000.00  162            27.19  143  Mill Calculated Ratios - Plant 1    Date BM -1   kW-h/t  BM -1 TPD  BM - 2     kW-h/t Transfer Size (um) Float Feed  P80 (μm) Wio 12-Nov-15     16.64      18,226        16.65             6,000.00  180            26.96  13-Nov-15     15.08      20,111        15.10             6,000.00  195            25.69  14-Nov-15     15.37      18,058        15.40             6,000.00  197            26.38  15-Nov-15     15.53      19,363        15.48             6,000.00  202            27.03  16-Nov-15     15.97      17,196        16.00             6,000.00  196            27.29  17-Nov-15           -                62              -               6,000.00  194                  -    18-Nov-15     15.31      18,411        15.31             6,000.00  183            25.12  19-Nov-15     15.74      19,425        15.60             6,000.00  197            26.98  20-Nov-15     14.67      20,695        14.70             6,000.00  217            26.67  21-Nov-15     14.72      20,666        14.77             6,000.00  216            26.74  22-Nov-15     16.23      18,750        16.26             6,000.00  209            28.82  23-Nov-15     17.17      17,630        17.19             6,000.00  195            29.21  24-Nov-15     15.58      19,593        15.60             6,000.00  220            28.59  25-Nov-15     15.85      17,712        15.80             6,000.00  203            27.67  26-Nov-15     14.92      20,311        14.91             6,000.00  226            27.80  27-Nov-15     13.81      20,509        13.90             6,000.00  241            26.86  28-Nov-15     13.89      19,836        13.92             6,000.00  245            27.25  29-Nov-15     14.12      21,279        14.18             6,000.00  234            26.90  30-Nov-15     15.96      16,580        16.01             6,000.00  220            29.23  1-Dec-15           -                 -                -               6,000.00      2-Dec-15           -                 -                -               6,000.00      3-Dec-15           -                 -                -               6,000.00  227                  -    144  Mill Calculated Ratios - Plant 1    Date BM -1   kW-h/t  BM -1 TPD  BM - 2     kW-h/t Transfer Size (um) Float Feed  P80 (μm) Wio 4-Dec-15           -                 -          11.21             6,000.00  220                  -    5-Dec-15           -                 -          13.27             6,000.00  244                  -    6-Dec-15           -                 -          11.09             6,000.00  220                  -    7-Dec-15           -                 -          11.38             6,000.00  229                  -    8-Dec-15     14.55        9,183        14.49             6,000.00  207            25.67  9-Dec-15     14.04      21,300        13.95             6,000.00  222            25.90  10-Dec-15     13.95      21,637        13.62             6,000.00  240            26.99  11-Dec-15     14.29      21,221        14.00             6,000.00  229            26.87  12-Dec-15     14.51      20,678        14.25             6,000.00  222            26.78  13-Dec-15     13.67      22,075        13.51             6,000.00  222            25.23  14-Dec-15     14.64      20,419        14.34             6,000.00  228            27.43  15-Dec-15     14.34      21,024        13.96             6,000.00  243            27.98  16-Dec-15     14.24      21,069        14.27             6,000.00  227            26.65  17-Dec-15     15.19      19,896        15.18             6,000.00  212            27.26  18-Dec-15     15.72      19,410        15.66             6,000.00  190            26.39  19-Dec-15     16.03      19,036        15.99             6,000.00  198            27.57  20-Dec-15     16.90      18,145        16.75             6,000.00  195            28.78  21-Dec-15     15.66      19,532        15.53             6,000.00  208            27.77  22-Dec-15     20.11      15,200        20.03             6,000.00  136            27.65  23-Dec-15     17.02      16,435        16.91             6,000.00  163            26.02  24-Dec-15     14.45      20,985        14.36             6,000.00  210            25.75  25-Dec-15     14.84      20,372        14.75             6,000.00  214            26.74  145  Mill Calculated Ratios - Plant 1    Date BM -1   kW-h/t  BM -1 TPD  BM - 2     kW-h/t Transfer Size (um) Float Feed  P80 (μm) Wio 26-Dec-15     17.26      17,600        16.98             6,000.00  185            28.43  27-Dec-15     14.80      20,440        14.42             6,000.00  196            25.30  28-Dec-15     15.29      19,766        15.04             6,000.00  194            26.00  29-Dec-15     16.31      16,064        16.05             6,000.00  197            28.00  30-Dec-15     14.78      20,561        14.63             6,000.00  215            26.76  31-Dec-15     15.10      20,063        15.03             6,000.00  232            28.66  1-Jan-16     14.84      20,303        14.64             6,000.00  237            28.54  2-Jan-16     14.40      15,379        14.35             6,000.00  191            24.26  3-Jan-16     14.58      20,976        14.43             6,000.00  247            28.72  4-Jan-16     14.70      20,700        14.56             6,000.00  253            29.41  5-Jan-16     15.20      20,090        15.14             6,000.00  213            27.36  6-Jan-16     13.19      22,974        13.22             6,000.00  218            24.05  7-Jan-16     14.29      21,152        13.55             6,000.00  215            25.82  8-Jan-16     11.33      26,761              -               6,000.00  219            20.72  9-Jan-16     13.63      22,156          7.66             6,000.00  201            23.64  10-Jan-16     16.92      17,774        16.14             6,000.00  208            29.97  11-Jan-16     16.28      18,398        15.98             6,000.00  182            26.64  12-Jan-16           -                  4              -               6,000.00  185                  -    13-Jan-16     16.09      14,659        15.55             6,000.00  179            25.99  14-Jan-16     14.85      18,402        14.21             6,000.00  165            22.89  15-Jan-16     14.85      10,226        14.31             6,000.00  184            24.43  16-Jan-16     16.11      18,872        15.66             6,000.00  174            25.59  146  Mill Calculated Ratios - Plant 1    Date BM -1   kW-h/t  BM -1 TPD  BM - 2     kW-h/t Transfer Size (um) Float Feed  P80 (μm) Wio 17-Jan-16     15.70      18,480        15.26             6,000.00  170            24.66  18-Jan-16     16.96      17,932        16.57             6,000.00  164            26.02  19-Jan-16     16.25      18,173        15.84             6,000.00  170            25.49  20-Jan-16     14.69      20,640        14.53             6,000.00  182            23.97  21-Jan-16     15.37      19,740        15.18             6,000.00  183            25.18  22-Jan-16     15.11      10,466        15.02             6,000.00  190            25.33  23-Jan-16     14.85      20,066        14.77             6,000.00  191            24.98  24-Jan-16     14.40      21,124        14.21             6,000.00  200            24.94  25-Jan-16     13.93      21,819        13.64             6,000.00  192            23.52  26-Jan-16     13.12      23,143        12.82             6,000.00  206            23.10  27-Jan-16     15.44      10,542        15.01             6,000.00  182            25.23  28-Jan-16     15.60      19,367        15.48             6,000.00  173            24.68  29-Jan-16     15.02      15,491        14.85             6,000.00  163            22.95  30-Jan-16     14.07      17,597        13.83             6,000.00  203            24.60  31-Jan-16     13.76      22,114        13.58             6,000.00  195            23.44  1-Feb-16     14.17      19,817        14.01             6,000.00  192            23.94  2-Feb-16           -                 -          10.79             6,000.00  198                  -    3-Feb-16       7.73        7,798        13.57             6,000.00  154            11.40  4-Feb-16     13.47      22,036        13.55             6,000.00  202            23.45  5-Feb-16     13.40      22,156        13.47             6,000.00  214            24.19  6-Feb-16     13.33      22,238        13.35             6,000.00  221            24.53  7-Feb-16     14.08      18,048        13.96             6,000.00  225            26.21  147  Mill Calculated Ratios - Plant 1    Date BM -1   kW-h/t  BM -1 TPD  BM - 2     kW-h/t Transfer Size (um) Float Feed  P80 (μm) Wio 8-Feb-16     12.59      23,373        12.63             6,000.00  233            23.94  9-Feb-16     12.76      23,110        12.76             6,000.00  227            23.83  10-Feb-16     12.28      23,978        12.34             6,000.00  246            24.17  11-Feb-16     13.67      20,873        13.75             6,000.00  212            24.53  12-Feb-16     13.27      22,268        13.41             6,000.00  219            24.30  13-Feb-16     12.83      20,500        12.93             6,000.00  221            23.62  14-Feb-16     12.98      22,776        13.03             6,000.00  229            24.37  15-Feb-16     14.26      20,848        14.14             6,000.00  214            25.71  16-Feb-16     12.83        6,875        12.94             6,000.00  202            22.31  17-Feb-16     13.02      22,837        12.98             6,000.00  206            22.93  18-Feb-16     14.59      20,540        14.62             6,000.00  183            23.92  19-Feb-16     13.49      22,003        13.38             6,000.00  213            24.25  20-Feb-16     13.78      21,586        13.82             6,000.00  207            24.37  21-Feb-16     13.13      21,222        13.04             6,000.00  222            24.20  22-Feb-16     14.65      16,475        14.44             6,000.00  220            26.90  23-Feb-16     14.02      21,019        14.03             6,000.00  195            23.89  24-Feb-16     13.73      21,447        13.68             6,000.00  204            24.06  25-Feb-16     13.61      21,752        13.56             6,000.00  203            23.74  26-Feb-16     14.08      21,003        14.07             6,000.00  204            24.64  27-Feb-16     13.83      21,396        14.45             6,000.00  203            24.14  28-Feb-16     13.50      21,687        13.54             6,000.00  215            24.44  29-Feb-16     13.42      21,911        13.40             6,000.00  208            23.79  148  Mill Calculated Ratios - Plant 1    Date BM -1   kW-h/t  BM -1 TPD  BM - 2     kW-h/t Transfer Size (um) Float Feed  P80 (μm) Wio 1-Mar-16     15.64      18,950        15.60             6,000.00  183            25.62  2-Mar-16     14.17      20,719        14.22             6,000.00  197            24.27  3-Mar-16     14.43      20,476        14.39             6,000.00  189            24.08  4-Mar-16     15.93      18,674        15.96             6,000.00  186            26.41  5-Mar-16     14.68      20,384        14.63             6,000.00  191            24.68  6-Mar-16     13.89      21,499        13.91             6,000.00  182            22.66  7-Mar-16     14.43      20,468        14.43             6,000.00  214            26.01  8-Mar-16     13.92      17,975        13.91             6,000.00  217            25.32  9-Mar-16     13.96      21,529        13.92             6,000.00  221            25.69  10-Mar-16     14.25      17,099        14.08             6,000.00  207            25.19  11-Mar-16     13.35      22,312        13.15             6,000.00  224            24.75  12-Mar-16     14.63      20,297        14.46             6,000.00  213            26.28  13-Mar-16     16.59      18,202        16.36             6,000.00  178            26.78  14-Mar-16     14.99      19,875        14.83             6,000.00  194            25.44  15-Mar-16           -                 -                -               6,000.00      16-Mar-16     19.33        7,181        19.73             6,000.00  149            27.98  17-Mar-16     18.89      16,007        18.72             6,000.00  178            30.45  18-Mar-16     16.47      18,179        16.69             6,000.00  194            27.95  19-Mar-16     16.65      16,055        16.61             6,000.00  212            29.82  20-Mar-16     14.87      20,333        14.80             6,000.00  208            26.35  21-Mar-16     15.23      19,333        15.21             6,000.00  211            27.26  22-Mar-16     16.05      18,757        16.12             6,000.00  201            27.89  149  Mill Calculated Ratios - Plant 1    Date BM -1   kW-h/t  BM -1 TPD  BM - 2     kW-h/t Transfer Size (um) Float Feed  P80 (μm) Wio 23-Mar-16     14.47      20,543        14.47             6,000.00  210            25.79  24-Mar-16     14.12      21,244        14.28             6,000.00  203            24.68  25-Mar-16     13.92      21,344        14.20             6,000.00  215            25.14  26-Mar-16     14.18      20,950        14.51             6,000.00  216            25.72  27-Mar-16     18.20      16,172        18.34             6,000.00  151            26.61  28-Mar-16     19.01      16,008        18.97             6,000.00  153            27.94  29-Mar-16     18.79      16,077        18.80             6,000.00  154            27.80  30-Mar-16     14.76      20,456        14.79             6,000.00  209            26.26  31-Mar-16     13.83      21,796        13.89             6,000.00  215            24.98  1-Apr-16     14.47      20,920        14.47             6,000.00  208            25.66  2-Apr-16     14.72      20,488        14.78             6,000.00  210            26.24  3-Apr-16     13.90      21,731        13.86             6,000.00  217            25.30  4-Apr-16     15.19      19,879        15.21             6,000.00  195            25.84  5-Apr-16     17.24      17,533        17.29             6,000.00  164            26.48  6-Apr-16     20.16      14,313        20.31             6,000.00  146            28.87  7-Apr-16     20.11      11,898        20.09             6,000.00  144            28.50  8-Apr-16     18.02      16,832        18.06             6,000.00  154            26.68  9-Apr-16     13.93      21,699        13.98             6,000.00  194            23.69  10-Apr-16     13.77      21,937        13.87             6,000.00  218            25.14  11-Apr-16     13.70      21,623        13.80             6,000.00  221            25.23  12-Apr-16           -                 -                -               6,000.00      13-Apr-16     18.07        4,327        18.11             6,000.00  129            24.01  150  Mill Calculated Ratios - Plant 1    Date BM -1   kW-h/t  BM -1 TPD  BM - 2     kW-h/t Transfer Size (um) Float Feed  P80 (μm) Wio 14-Apr-16     15.76      19,028        15.81             6,000.00  179            25.45  15-Apr-16     15.57      16,695        15.49             6,000.00  195            26.55  16-Apr-16     15.27      19,595        15.39             6,000.00  188            25.47  17-Apr-16     14.66      20,314        14.76             6,000.00  188            24.42  18-Apr-16     15.05      14,995        15.22             6,000.00  176            24.08  19-Apr-16     16.34      16,176        16.38             6,000.00  186            27.03  20-Apr-16     15.13      19,165        15.13             6,000.00  175            24.17  21-Apr-16     16.16      18,589        16.26             6,000.00  165            24.87  22-Apr-16     14.75      19,400        14.85             6,000.00  184            24.28  23-Apr-16     15.27      19,454        15.27             6,000.00  169            23.88  24-Apr-16     15.29      19,385        15.48             6,000.00  188            25.45  25-Apr-16     16.57      16,069        16.62             6,000.00  190            27.80  26-Apr-16     15.12      19,597        15.15             6,000.00  187            25.07  27-Apr-16     14.22      20,750        14.32             6,000.00  205            24.95  28-Apr-16     15.03      19,706        15.06             6,000.00  193            25.41  29-Apr-16     16.44      18,035        16.50             6,000.00  185            27.10  30-Apr-16     14.43      20,451        14.38             6,000.00  209            25.67  1-May-16     14.83      19,863        14.82             6,000.00  215            26.82  2-May-16     15.03      19,704        14.95             6,000.00  210            26.79  3-May-16           -                 -                -               6,000.00      4-May-16           -                 -                -               6,000.00      5-May-16     13.41        8,186        13.20             6,000.00  243            26.21  151  Mill Calculated Ratios - Plant 1    Date BM -1   kW-h/t  BM -1 TPD  BM - 2     kW-h/t Transfer Size (um) Float Feed  P80 (μm) Wio 6-May-16     14.68      13,837        14.69             6,000.00  202            25.58  7-May-16     14.08      20,484        14.24             6,000.00  195            23.99  8-May-16     14.68      18,111        14.43             6,000.00  248            28.97  9-May-16     13.65      21,168        13.55             6,000.00  227            25.52  10-May-16     13.64      21,331        13.65             6,000.00  256            27.50  11-May-16     13.89      21,297        13.80             6,000.00  208            24.61  12-May-16     14.56      15,233        14.48             6,000.00  201            25.31  13-May-16     14.03      20,991        14.03             6,000.00  199            24.23  14-May-16     13.03      22,560        13.03             6,000.00  213            23.42  15-May-16     12.12      24,425        12.05             6,000.00  211            21.69  16-May-16     12.52      23,486        12.51             6,000.00  211            22.38  17-May-16     13.52      21,697        13.59             6,000.00  214            24.36  18-May-16     12.66      23,115        12.83             6,000.00  210            22.55  19-May-16     12.64      22,996        12.86             6,000.00  215            22.84  20-May-16     13.53      21,766        13.67             6,000.00  212            24.24  21-May-16     13.70      21,373        13.82             6,000.00  223            25.35  22-May-16     14.81      19,991        14.81             6,000.00  213            26.60  23-May-16     13.80      21,671        13.41             6,000.00  196            23.62  24-May-16     13.72      21,704        13.50             6,000.00  208            24.33  25-May-16     15.24      15,328        10.82             6,000.00  202            26.56  26-May-16     13.98      21,436        13.73             6,000.00  210            24.90  27-May-16     13.90      21,461        13.72             6,000.00  204            24.36  152  Mill Calculated Ratios - Plant 1    Date BM -1   kW-h/t  BM -1 TPD  BM - 2     kW-h/t Transfer Size (um) Float Feed  P80 (μm) Wio 28-May-16     14.17      18,365        13.99             6,000.00  209            25.16  29-May-16     14.96      19,964        14.71             6,000.00  198            25.68  30-May-16     14.58      20,410        14.37             6,000.00  205            25.59  31-May-16     13.61      21,829        13.47             6,000.00  224            25.21  1-Jun-16     13.67      19,897        13.60             6,000.00  210            24.38  2-Jun-16     13.15      22,478        13.10             6,000.00  224            24.37  3-Jun-16     14.06      21,068        14.03             6,000.00  206            24.75  4-Jun-16     13.52      21,709        13.42             6,000.00  214            24.41  5-Jun-16     13.19      22,418        13.09             6,000.00  217            24.02  6-Jun-16     13.43      21,907        13.36             6,000.00  214            24.23  7-Jun-16     19.38        3,108        19.45             6,000.00  210            34.54  8-Jun-16     14.30      20,961        14.19             6,000.00  208            25.33  9-Jun-16     16.36      18,387        16.24             6,000.00  188            27.25  10-Jun-16     15.63      18,154        15.38             6,000.00  189            26.09  11-Jun-16     14.86      20,269        14.65             6,000.00  200            25.71  12-Jun-16     14.25      21,171        14.08             6,000.00  212            25.52  13-Jun-16     16.33      18,460        16.18             6,000.00  184            26.82  14-Jun-16     16.09      18,759        15.96             6,000.00  190            27.01  15-Jun-16     18.10      16,596        18.12             6,000.00  174            28.81  16-Jun-16     15.01      19,810        15.04             6,000.00  217            27.28  17-Jun-16     16.83      17,196        16.92             6,000.00  203            29.39  18-Jun-16     17.04      17,604        17.07             6,000.00  192            28.77  153  Mill Calculated Ratios - Plant 1    Date BM -1   kW-h/t  BM -1 TPD  BM - 2     kW-h/t Transfer Size (um) Float Feed  P80 (μm) Wio 19-Jun-16     15.26      19,567        15.32             6,000.00  194            25.93  20-Jun-16     15.05      19,901        15.06             6,000.00  181            24.51  21-Jun-16     15.08      19,871        15.09             6,000.00  184            24.82  22-Jun-16     14.45      20,807        14.24             6,000.00  211            25.85  23-Jun-16     15.01      18,335        14.99             6,000.00  201            26.08  24-Jun-16     14.90      20,144        14.81             6,000.00  214            26.89  25-Jun-16     14.47      20,818        14.49             6,000.00  192            24.43  26-Jun-16     13.57      22,117        13.69             6,000.00  209            24.12  27-Jun-16     13.86      21,101        13.94             6,000.00  210            24.70  28-Jun-16     14.02      21,187        14.20             6,000.00  204            24.59  29-Jun-16     14.16      19,897        14.45             6,000.00  218            25.83  30-Jun-16     15.09      18,775        15.14             6,000.00  202            26.25  1-Jul-16     15.78      19,023        15.73             6,000.00  180            25.57  2-Jul-16     13.50      22,264        13.45             6,000.00  211            24.14  3-Jul-16     13.72      21,705        13.76             6,000.00  208            24.35  4-Jul-16     14.16      20,918        14.24             6,000.00  223            26.19  5-Jul-16     14.40      20,540        14.57             6,000.00  214            25.95  6-Jul-16     14.30      20,821        14.41             6,000.00  233            27.15  7-Jul-16     16.52      18,298        16.55             6,000.00  183            27.05  8-Jul-16     18.20      16,187        18.38             6,000.00  143            25.76  9-Jul-16     21.09      12,932        21.26             6,000.00  135            28.79  10-Jul-16     17.48      17,260        17.52             6,000.00  180            28.40  154  Mill Calculated Ratios - Plant 1    Date BM -1   kW-h/t  BM -1 TPD  BM - 2     kW-h/t Transfer Size (um) Float Feed  P80 (μm) Wio 11-Jul-16     16.96      17,907        16.81             6,000.00  197            29.05  12-Jul-16     15.15        6,536              -               6,000.00  185            25.01  13-Jul-16     12.75      23,489        12.86             6,000.00  228            23.90  14-Jul-16     13.28      22,399        13.57             6,000.00  211            23.71  15-Jul-16     12.96      23,003        13.14             6,000.00  235            24.76  16-Jul-16     13.08      22,796        13.24             6,000.00  218            23.87  17-Jul-16     12.95      23,137        13.07             6,000.00  219            23.66  18-Jul-16     13.22      21,475        13.31             6,000.00  207            23.36  19-Jul-16     12.72      23,474        12.84             6,000.00  228            23.86  20-Jul-16     15.06      16,125        15.07             6,000.00  202            26.21  21-Jul-16     14.57      20,710        14.65             6,000.00  186            24.12  22-Jul-16     14.43      20,784        14.53             6,000.00  184            23.74  23-Jul-16     14.26      20,962        14.40             6,000.00  203            24.89  24-Jul-16     14.08      21,357        14.28             6,000.00  205            24.71  25-Jul-16     12.81      23,340        13.07             6,000.00  222            23.62  26-Jul-16     13.26      22,639        13.38             6,000.00  218            24.20  27-Jul-16     12.46      23,964        12.62             6,000.00  219            22.80  28-Jul-16     14.19      20,996        14.40             6,000.00  201            24.64  29-Jul-16     13.51      21,967        13.69             6,000.00  204            23.65  30-Jul-16     13.57      21,860        13.78             6,000.00  215            24.58  31-Jul-16     13.01      21,411        13.09             6,000.00  214            23.48  1-Aug-16     13.42      22,380        13.45             6,000.00  209            23.87  155  Mill Calculated Ratios - Plant 1    Date BM -1   kW-h/t  BM -1 TPD  BM - 2     kW-h/t Transfer Size (um) Float Feed  P80 (μm) Wio 2-Aug-16     13.22      22,438        13.32             6,000.00  231            24.98  3-Aug-16     13.30      22,568        13.42             6,000.00  212            23.81  4-Aug-16     13.40      22,319        13.56             6,000.00  218            24.44  5-Aug-16     13.58      21,987        13.75             6,000.00  203            23.74  6-Aug-16     12.79      23,306        13.02             6,000.00  229            24.07  7-Aug-16     13.27      22,491        13.51             6,000.00  218            24.21  8-Aug-16     13.95      21,252        14.07             6,000.00  206            24.60  9-Aug-16           -                 -                -               6,000.00      10-Aug-16           -                 -                -               6,000.00      11-Aug-16           -                 -                -               6,000.00      12-Aug-16     14.04      21,079        14.04             6,000.00  215            25.42  13-Aug-16     13.91      21,314        13.89             6,000.00  236            26.68  14-Aug-16     13.99      21,311        13.96             6,000.00  213            25.18  15-Aug-16     15.11      15,929        15.09             6,000.00  221            27.83  16-Aug-16     13.47      22,028        13.49             6,000.00  216            24.43  17-Aug-16     14.90      19,927        14.96             6,000.00  191            25.09  18-Aug-16     15.55      19,263        15.62             6,000.00  183            25.47  19-Aug-16     15.20      19,944        15.23             6,000.00  170            23.85  20-Aug-16     17.04      17,792        16.99             6,000.00  152            24.94  21-Aug-16     16.68      18,079        16.73             6,000.00  164            25.56  22-Aug-16     15.91      17,888        15.87             6,000.00  183            26.06  23-Aug-16     14.45      20,656        14.55             6,000.00  197            24.77  156  Mill Calculated Ratios - Plant 1    Date BM -1   kW-h/t  BM -1 TPD  BM - 2     kW-h/t Transfer Size (um) Float Feed  P80 (μm) Wio 24-Aug-16     13.84      21,257        13.99             6,000.00  211            24.70  25-Aug-16     14.22      20,755        14.41             6,000.00  200            24.62  26-Aug-16     14.72      19,985        14.89             6,000.00  215            26.65  27-Aug-16     14.43      20,288        14.68             6,000.00  216            26.16  28-Aug-16     14.41      20,297        14.66             6,000.00  208            25.52  29-Aug-16     13.59      14,488        13.69             6,000.00  226            25.35  30-Aug-16     12.80      22,907        12.98             6,000.00  234            24.36  31-Aug-16     13.68      21,999        13.77             6,000.00  224            25.37  1-Sep-16     14.76      20,585        14.78             6,000.00  195            25.14  2-Sep-16     13.60      22,384        13.59             6,000.00  206            23.99  3-Sep-16     13.63      22,405        13.59             6,000.00  197            23.37  4-Sep-16     13.88      21,832        13.91             6,000.00  211            24.84  5-Sep-16     13.55      22,355        13.59             6,000.00  224            25.16  6-Sep-16     14.36      21,241        14.35             6,000.00  225            26.71  7-Sep-16           -                 -                -               6,000.00      8-Sep-16     13.63      16,846        13.69             6,000.00  234            25.95  9-Sep-16     14.05      19,209        14.00             6,000.00  226            26.20  10-Sep-16     11.97      25,321        12.03             6,000.00  256            24.13  11-Sep-16     13.03      22,886        13.02             6,000.00  258            26.41  12-Sep-16     12.82      23,617        12.77             6,000.00  263            26.30  13-Sep-16     13.39      22,614        13.31             6,000.00  228            25.15  14-Sep-16     14.23      21,024        14.00             6,000.00  222            26.24  157  Mill Calculated Ratios - Plant 1    Date BM -1   kW-h/t  BM -1 TPD  BM - 2     kW-h/t Transfer Size (um) Float Feed  P80 (μm) Wio 15-Sep-16     14.30      19,646        14.22             6,000.00  230            26.99  16-Sep-16     13.42      22,612        13.33             6,000.00  241            26.09  17-Sep-16     14.17      21,299        14.06             6,000.00  238            27.27  18-Sep-16     13.27      22,965        13.18             6,000.00  228            24.91  19-Sep-16     13.17      23,223        13.03             6,000.00  235            25.18  20-Sep-16     13.32      22,966        13.05             6,000.00  234            25.39  21-Sep-16     13.18      23,171        12.91             6,000.00  242            25.67  22-Sep-16     13.34      21,031        13.14             6,000.00  244            26.10  23-Sep-16     14.70      19,798        14.45             6,000.00  240            28.51  24-Sep-16     12.52      24,292        12.30             6,000.00  253            25.05  25-Sep-16     13.49      22,542        13.30             6,000.00  251            26.88  26-Sep-16     11.67      26,029        11.51             6,000.00  275            24.60  27-Sep-16     12.06      25,217        11.86             6,000.00  271            25.22  28-Sep-16     12.84      20,785        12.78             6,000.00  280            27.42  29-Sep-16     13.10      23,303        12.98             6,000.00  254            26.32  30-Sep-16     13.27      23,059        13.21             6,000.00  236            25.46  1-Oct-16     13.28      23,082        13.18             6,000.00  219            24.31  2-Oct-16     13.85      22,068        13.76             6,000.00  234            26.42  3-Oct-16     14.65      20,952        14.56             6,000.00  223            27.12  4-Oct-16     13.02      23,501        12.90             6,000.00  270            27.16  5-Oct-16     13.43      22,687        13.24             6,000.00  246            26.40  6-Oct-16     13.77      22,135        13.70             6,000.00  238            26.54  158  Mill Calculated Ratios - Plant 1    Date BM -1   kW-h/t  BM -1 TPD  BM - 2     kW-h/t Transfer Size (um) Float Feed  P80 (μm) Wio 7-Oct-16     13.87      21,148        13.77             6,000.00  246            27.28  8-Oct-16     13.54      22,574        13.44             6,000.00  245            26.57  9-Oct-16     13.66      22,352        13.37             6,000.00  229            25.72  10-Oct-16     12.23      24,691        11.95             6,000.00  278            25.96  11-Oct-16     14.05      21,495        13.71             6,000.00  253            28.11  12-Oct-16     16.59        5,125        15.96             6,000.00  210            29.55  13-Oct-16     14.15      21,563        14.12             6,000.00  227            26.45  14-Oct-16     15.01      20,418        14.78             6,000.00  230            28.27  15-Oct-16     14.22      21,168        14.14             6,000.00  240            27.55  16-Oct-16     14.47      21,111        14.33             6,000.00  221            26.60  17-Oct-16     13.96      21,896        13.88             6,000.00  240            27.04  18-Oct-16     13.69      22,337        13.63             6,000.00  228            25.66  19-Oct-16     14.52      21,145        14.39             6,000.00  223            26.85  20-Oct-16     14.00      21,773        13.95             6,000.00  234            26.69  21-Oct-16     12.96      23,558        12.91             6,000.00  251            25.81  22-Oct-16     12.69      24,062        12.68             6,000.00  242            24.68  23-Oct-16     12.32      24,780        12.32             6,000.00  267            25.52  24-Oct-16     14.47      21,102        14.45             6,000.00  218            26.37  25-Oct-16     13.75      22,202        13.70             6,000.00  214            24.81  26-Oct-16     14.77      17,815        14.74             6,000.00  219            26.99  27-Oct-16     13.46      22,742        13.47             6,000.00  242            26.23  28-Oct-16     13.32      23,066        13.29             6,000.00  246            26.20  159  Mill Calculated Ratios - Plant 1    Date BM -1   kW-h/t  BM -1 TPD  BM - 2     kW-h/t Transfer Size (um) Float Feed  P80 (μm) Wio 29-Oct-16     13.69      13,155        13.63             6,000.00  255            27.52  30-Oct-16     13.27      23,226        13.24             6,000.00  238            25.54  31-Oct-16     14.07      17,081        14.01             6,000.00  246            27.70  1-Nov-16     13.19      23,327        13.13             6,000.00  240            25.57  2-Nov-16     13.59      22,456        13.57             6,000.00  232            25.79  3-Nov-16     13.39      22,731        13.37             6,000.00  240            25.95  4-Nov-16     13.25      22,933        13.19             6,000.00  250            26.29  5-Nov-16     12.53      24,284        12.40             6,000.00  240            24.28  6-Nov-16     13.22      22,893        13.15             6,000.00  229            24.88  7-Nov-16     13.09      18,254        13.01             6,000.00  246            25.75  8-Nov-16     13.52      22,384        13.50             6,000.00  221            24.89  9-Nov-16     13.62      22,479        13.62             6,000.00  223            25.18  10-Nov-16     13.87      22,061        13.87             6,000.00  222            25.60  11-Nov-16     13.24      23,162        13.28             6,000.00  229            24.87  12-Nov-16     13.41      22,961        13.38             6,000.00  232            25.41  13-Nov-16     12.75      24,066        12.71             6,000.00  226            23.79  14-Nov-16     13.07      23,428        13.07             6,000.00  249            25.88  15-Nov-16     13.07      23,439        13.07             6,000.00  252            26.13  16-Nov-16     12.39      24,646        12.34             6,000.00  258            25.11  17-Nov-16     15.06      20,265        15.03             6,000.00  202            26.20  18-Nov-16     14.58      18,621        14.59             6,000.00  209            25.89  19-Nov-16     13.83      22,047        13.70             6,000.00  203            24.17  160  Mill Calculated Ratios - Plant 1    Date BM -1   kW-h/t  BM -1 TPD  BM - 2     kW-h/t Transfer Size (um) Float Feed  P80 (μm) Wio 20-Nov-16     12.90      23,642        12.79             6,000.00  243            25.14  21-Nov-16     12.93      23,565        12.76             6,000.00  260            26.36  22-Nov-16           -                 -                -               6,000.00      23-Nov-16     14.46        7,951        14.26             6,000.00  233            27.51  24-Nov-16     14.43      20,874        14.41             6,000.00  210            25.70  25-Nov-16     15.50      14,702        15.43             6,000.00  224            28.79  26-Nov-16     14.05      21,764        14.03             6,000.00  236            26.93  27-Nov-16     14.07      21,422        14.08             6,000.00  224            26.13  28-Nov-16     13.89      22,025        13.85             6,000.00  234            26.46  29-Nov-16     13.58      22,565        13.53             6,000.00  240            26.30  30-Nov-16     13.37      22,709        13.28             6,000.00  242            26.05  1-Dec-16     13.98      20,830        14.07             6,000.00  249            27.68  2-Dec-16     13.28      22,822        13.24             6,000.00  255            26.68  3-Dec-16     12.97      23,350        12.98             6,000.00  280            27.69  4-Dec-16     14.00      21,637        13.88             6,000.00  270            29.22  5-Dec-16     14.38      21,084        14.31             6,000.00  224            26.70  6-Dec-16     14.75      20,672        14.49             6,000.00  211            26.34  7-Dec-16     14.65      20,819        14.56             6,000.00  229            27.55  8-Dec-16     14.73      18,316        14.73             6,000.00  233            28.04  9-Dec-16     13.87      22,064        13.86             6,000.00  244            27.15  10-Dec-16     14.31      20,944        14.26             6,000.00  227            26.75  11-Dec-16     14.33      21,273        14.31             6,000.00  232            27.16  161  Mill Calculated Ratios - Plant 1    Date BM -1   kW-h/t  BM -1 TPD  BM - 2     kW-h/t Transfer Size (um) Float Feed  P80 (μm) Wio 12-Dec-16     14.90      20,504        14.96             6,000.00  230            28.06  13-Dec-16     15.63      17,266        15.63             6,000.00  213            28.08  14-Dec-16     18.16        3,952        18.07             6,000.00  210            32.38  15-Dec-16     15.25      18,559        15.25             6,000.00  206            26.87  16-Dec-16     13.49      22,509        13.55             6,000.00  241            26.16  17-Dec-16     13.15      22,839        13.16             6,000.00  258            26.69  18-Dec-16     13.61      22,373        13.61             6,000.00  246            26.77  19-Dec-16     14.14      21,295        14.22             6,000.00  245            27.73  20-Dec-16     15.77      19,223        15.87             6,000.00  213            28.35  21-Dec-16     14.97      20,389        15.00             6,000.00  233            28.48  22-Dec-16     15.76      19,416        15.78             6,000.00  201            27.38  23-Dec-16     15.26      19,938          8.18             6,000.00  212            27.39  24-Dec-16     16.17      18,997        16.10             6,000.00  198            27.82  25-Dec-16     15.06      20,368        15.14             6,000.00  211            26.92  26-Dec-16     14.96      20,492        15.01             6,000.00  211            26.73  27-Dec-16     17.99      15,550        17.96             6,000.00  181            29.29  28-Dec-16     16.74      16,191        16.77             6,000.00  184            27.56  29-Dec-16     16.00      17,366        15.96             6,000.00  192            26.98  30-Dec-16     14.59      20,837        14.62             6,000.00  228            27.40  31-Dec-16     14.47      20,990        14.51             6,000.00  237            27.82  1-Jan-17     14.34      21,084        14.38             6,000.00  227            26.82  2-Jan-17     15.50      18,849        15.54             6,000.00  219            28.32  162  Mill Calculated Ratios - Plant 1    Date BM -1   kW-h/t  BM -1 TPD  BM - 2     kW-h/t Transfer Size (um) Float Feed  P80 (μm) Wio 3-Jan-17     13.16      23,005        13.13             6,000.00  276            27.80  4-Jan-17     14.41      21,049        14.43             6,000.00  226            26.92  5-Jan-17     14.21      21,336        14.17             6,000.00  226            26.48  6-Jan-17     14.06      21,523        14.04             6,000.00  244            27.54  7-Jan-17     14.38      20,836        14.45             6,000.00  242            28.02  8-Jan-17     13.96      21,811        13.83             6,000.00  235            26.68  9-Jan-17     15.04      18,113        14.97             6,000.00  226            28.04  10-Jan-17     15.33      16,961        15.15             6,000.00  229            28.81  11-Jan-17     14.11      21,481        14.15             6,000.00  231            26.69  12-Jan-17     13.34      22,717        13.26             6,000.00  269            27.75  13-Jan-17     13.37      22,555        13.37             6,000.00  272            28.02  14-Jan-17     13.77      22,055        13.71             6,000.00  256            27.74  15-Jan-17     17.20      17,680        17.25             6,000.00  255            34.63  16-Jan-17     17.19      17,796        17.17             6,000.00  176            27.55  17-Jan-17           -                 -                -               6,000.00      18-Jan-17           -                 -                -               6,000.00      19-Jan-17     14.64        7,194        14.59             6,000.00  224            27.15  20-Jan-17     14.68      20,861        14.63             6,000.00  212            26.36  21-Jan-17     15.28      20,079        15.29             6,000.00  211            27.35  22-Jan-17     14.36      21,248        14.41             6,000.00  227            26.87  23-Jan-17     14.69      17,667        14.62             6,000.00  221            26.98  24-Jan-17     14.17      21,748        14.13             6,000.00  227            26.47  163  Mill Calculated Ratios - Plant 1    Date BM -1   kW-h/t  BM -1 TPD  BM - 2     kW-h/t Transfer Size (um) Float Feed  P80 (μm) Wio 25-Jan-17     14.65      20,811        14.65             6,000.00  215            26.48  26-Jan-17     14.25      21,425        14.24             6,000.00  215            25.75  27-Jan-17     14.70      20,743        14.73             6,000.00  223            27.21  28-Jan-17     15.08      19,660        15.04             6,000.00  230            28.42  29-Jan-17     13.69      22,304        13.67             6,000.00  228            25.67  30-Jan-17     14.35      21,341        14.26             6,000.00  221            26.41  31-Jan-17     14.33      21,343        14.28             6,000.00  230            27.02  1-Feb-17     14.55      21,042        14.54             6,000.00  228            27.25  2-Feb-17     13.83      22,215        13.64             6,000.00  253            27.64  3-Feb-17     13.82      18,195        13.64             6,000.00  263            28.32  4-Feb-17     12.66      24,292        12.49             6,000.00  244            24.74  5-Feb-17     15.45      19,801        15.39             6,000.00  219            28.28  6-Feb-17     16.71      18,359        16.55             6,000.00  207            29.52  7-Feb-17     19.09      15,336        19.03             6,000.00  180            31.01  8-Feb-17     16.12      18,856        16.01             6,000.00  205            28.29  9-Feb-17     15.24      19,945        14.98             6,000.00  209            27.07  10-Feb-17     14.33      21,257        14.21             6,000.00  236            27.45  11-Feb-17     13.95      21,889        13.93             6,000.00  243            27.23  12-Feb-17     13.82      22,041        13.76             6,000.00  259            28.05  13-Feb-17     14.18      21,472        14.12             6,000.00  244            27.71  14-Feb-17     14.00      21,806        13.89             6,000.00  244            27.40  15-Feb-17     14.09           821        13.93             6,000.00  267            29.17  164  Mill Calculated Ratios - Plant 1    Date BM -1   kW-h/t  BM -1 TPD  BM - 2     kW-h/t Transfer Size (um) Float Feed  P80 (μm) Wio 16-Feb-17           -                 -          11.74             6,000.00  243                  -    17-Feb-17     11.85           891        12.05             6,000.00  228            22.21  18-Feb-17     11.87        5,504        12.56             6,000.00  227            22.18  19-Feb-17     14.74      19,553        15.51             6,000.00  238            28.40  20-Feb-17     15.05      15,863        15.09             6,000.00  216            27.30  21-Feb-17     15.39      19,927        15.52             6,000.00  215            27.86  22-Feb-17     16.71      17,515        16.74             6,000.00  198            28.74  23-Feb-17     14.62      20,684        14.71             6,000.00  225            27.16  24-Feb-17     14.37      20,854        14.54             6,000.00  240            27.84  25-Feb-17     13.73      22,031        13.81             6,000.00  259            27.85  26-Feb-17     13.69      21,051        13.82             6,000.00  236            26.26  27-Feb-17     16.08      18,873        16.12             6,000.00  190            27.00  28-Feb-17     14.11      21,366        14.16             6,000.00  234            26.86  1-Mar-17     15.09      20,083        15.26             6,000.00  233            28.66  2-Mar-17     13.48      22,739        13.51             6,000.00  233            25.63  3-Mar-17     13.93      21,868        14.04             6,000.00  250            27.66  4-Mar-17     13.08      23,333        13.14             6,000.00  240            25.35  5-Mar-17     13.85      22,036        13.94             6,000.00  220            25.42  6-Mar-17     14.02      21,720        14.12             6,000.00  217            25.54  7-Mar-17     15.22      20,078        15.23             6,000.00  208            27.00  8-Mar-17     14.25      21,018        14.36             6,000.00  249            28.25  9-Mar-17     14.59      19,431        14.63             6,000.00  244            28.58  165  Mill Calculated Ratios - Plant 1    Date BM -1   kW-h/t  BM -1 TPD  BM - 2     kW-h/t Transfer Size (um) Float Feed  P80 (μm) Wio 10-Mar-17     14.86      19,479        15.03             6,000.00  226            27.69  11-Mar-17     14.98      19,677        14.97             6,000.00  263            30.75  12-Mar-17     13.94      21,197        14.04             6,000.00  252            27.81  13-Mar-17     14.45      20,400        14.51             6,000.00  240            28.01  14-Mar-17           -                 -                -               6,000.00      15-Mar-17           -                 -          12.54             6,000.00  222                  -    16-Mar-17           -                 -          11.34             6,000.00  265                  -    17-Mar-17           -                 -          11.15             6,000.00  248                  -    18-Mar-17           -                 -          10.08             6,000.00  286                  -    19-Mar-17           -                 -          10.77             6,000.00  285                  -    20-Mar-17           -                 -          10.55             6,000.00  242                  -    21-Mar-17     13.47      15,203        13.50             6,000.00  216            24.46  22-Mar-17     13.79      21,603        13.79             6,000.00  260            28.10  23-Mar-17     13.54      21,831        13.61             6,000.00  261            27.62  24-Mar-17     13.44      21,961        13.55             6,000.00  269            27.94  25-Mar-17     13.45      21,905        13.55             6,000.00  278            28.58  26-Mar-17     13.56      21,719        13.69             6,000.00  277            28.75  27-Mar-17     13.46      21,861        13.62             6,000.00  249            26.69  28-Mar-17     15.78      18,833        15.76             6,000.00  192            26.63  29-Mar-17     15.79      19,073        15.83             6,000.00  184            25.97  30-Mar-17     15.22      18,330        15.39             6,000.00  209            27.03  31-Mar-17     13.98      21,793        14.09             6,000.00  235            26.69  166  Mill Calculated Ratios - Plant 1    Date BM -1   kW-h/t  BM -1 TPD  BM - 2     kW-h/t Transfer Size (um) Float Feed  P80 (μm) Wio 1-Apr-17     14.10      21,564        14.19             6,000.00  215            25.53  2-Apr-17     16.29      18,668        16.37             6,000.00  187            27.08  3-Apr-17     13.98      21,636        14.15             6,000.00  241            27.12  4-Apr-17     14.67      20,574        14.81             6,000.00  210            26.18  5-Apr-17     13.54      18,586        13.69             6,000.00  254            27.20  6-Apr-17     13.54      21,271        13.66             6,000.00  235            25.89  7-Apr-17     15.96      18,663        16.01             6,000.00  195            27.19  8-Apr-17     15.81      18,871        15.82             6,000.00  195            26.92  9-Apr-17     16.44      18,228        16.43             6,000.00  186            27.26  10-Apr-17     18.93      15,813        19.01             6,000.00  153            27.90  11-Apr-17           -                 -                -               6,000.00      12-Apr-17           -                 -                -               6,000.00      13-Apr-17           -                 -                -               6,000.00      14-Apr-17           -                 -                -               6,000.00      15-Apr-17           -                 -                -               6,000.00      16-Apr-17           -                 -                -               6,000.00      17-Apr-17           -                 -                -               6,000.00      18-Apr-17           -                 -                -               6,000.00      19-Apr-17           -                 -                -               6,000.00      20-Apr-17           -                 -                -               6,000.00      21-Apr-17           -                 -                -               6,000.00      22-Apr-17           -                 -                -               6,000.00      167  Mill Calculated Ratios - Plant 1    Date BM -1   kW-h/t  BM -1 TPD  BM - 2     kW-h/t Transfer Size (um) Float Feed  P80 (μm) Wio 23-Apr-17     19.33        5,462        19.25             6,000.00  177            31.03  24-Apr-17     17.06      17,536        17.05             6,000.00  178            27.50  25-Apr-17     16.50      12,624        16.46             6,000.00  185            27.24  26-Apr-17     15.64      19,359        15.39             6,000.00  215            28.24  27-Apr-17     14.81      20,367        14.65             6,000.00  243            28.86  28-Apr-17     14.28      20,965        14.18             6,000.00  238            27.52  29-Apr-17     13.91      21,438        13.85             6,000.00  257            28.10  30-Apr-17     13.79      21,524        13.70             6,000.00  264            28.33  1-May-17     13.65      22,020        13.53             6,000.00  258            27.65  2-May-17     13.55      22,249        13.49             6,000.00  251            26.97  3-May-17     13.67      21,653        13.56             6,000.00  258            27.73  4-May-17     13.79      21,713        13.71             6,000.00  251            27.49  5-May-17     13.79      21,223        13.77             6,000.00  256            27.84  6-May-17     13.42      22,243        13.34             6,000.00  259            27.23  7-May-17     13.60      22,151        13.45             6,000.00  259            27.65  8-May-17     14.89      20,155        14.73             6,000.00  219            27.28  9-May-17     13.57      22,194        13.47             6,000.00  238            26.13  10-May-17     14.75      20,278        14.69             6,000.00  235            28.22  11-May-17     13.47      22,477        13.38             6,000.00  258            27.33  12-May-17     13.63      22,308        13.45             6,000.00  244            26.67  13-May-17     14.42      20,231        14.24             6,000.00  218            26.31  14-May-17     13.81      22,048        13.62             6,000.00  230            26.02  168  Mill Calculated Ratios - Plant 1    Date BM -1   kW-h/t  BM -1 TPD  BM - 2     kW-h/t Transfer Size (um) Float Feed  P80 (μm) Wio 15-May-17     13.48      22,723        13.28             6,000.00  245            26.44  16-May-17     14.13      21,161        13.94             6,000.00  249            28.01  17-May-17     12.98      23,332        12.89             6,000.00  245            25.45  18-May-17     15.57      19,452        15.40             6,000.00  202            27.14  19-May-17     14.48      20,850        14.35             6,000.00  242            28.17  20-May-17     14.29      21,005        14.23             6,000.00  244            28.00  21-May-17     13.78      20,253        13.80             6,000.00  238            26.53  22-May-17     12.23      24,815        12.24             6,000.00  249            24.21  23-May-17     13.38      22,635        13.37             6,000.00  241            25.97  24-May-17     15.06      20,190        14.92             6,000.00  209            26.74  25-May-17     12.80      23,470        12.81             6,000.00  248            25.27  26-May-17     13.20      22,737        13.17             6,000.00  255            26.54  27-May-17     13.05      23,153        12.92             6,000.00  262            26.74  28-May-17     14.00      21,739        13.77             6,000.00  232            26.51  29-May-17     13.29      20,315        13.28             6,000.00  248            26.29  30-May-17     13.69      21,962        13.69             6,000.00  249            27.10  31-May-17     13.24      22,889        13.04             6,000.00  258            26.84     169  Mill Calculated Ratios - Plant 2 Date Work Index SAG 1     F80   microns  SAG 1     T80   microns  SAG 2     F80   microns  SAG 2     T80   microns  SAG 1      kW-h/t SAG 2     kW-h/t SAG 1   Wio SAG 2  Wio BM 1    P80  microns BM 2    P80  microns BM  1     kW-h/t BM  2     kW-h/t BM 1 Wio BM 2 Wio 1/1/2016      150,000       2,500    150,000      2,500  5.87 8.36 33.73 48.02 240.00 240.00 4.23 6.05 9.51 13.57 1/2/2016      150,000       2,500    150,000      2,500  5.78 8.03 33.16 46.09 240.00 240.00 4.38 6.42 9.83 14.41 1/3/2016      150,000       2,500    150,000      2,500  5.69 6.97 32.65 40.03 240.00 240.00 4.08 6.25 9.15 14.02 1/4/2016      150,000       2,500    150,000      2,500  5.58 5.94 32.06 34.10 286.82 285.73 4.22 6.08 10.80 15.54 1/5/2016      150,000       2,500    150,000      2,500  7.74 9.04 44.44 51.91 245.75 231.75 5.71 6.62 13.04 14.49 1/6/2016      150,000       2,500    150,000      2,500  7.11 8.29 40.84 47.58 235.66 243.59 6.73 7.41 14.91 16.82 1/7/2016      150,000       2,500    150,000      2,500  8.75 9.06 50.22 52.02 202.48 208.96 6.26 6.37 12.45 12.95 1/8/2016      150,000       2,500    150,000      2,500  9.54 9.82 54.77 56.39 184.31 198.71 6.46 7.65 12.03 15.01 1/9/2016      150,000       2,500    150,000      2,500  7.00 9.64 40.16 55.33 221.15 206.10 4.90 6.73 10.37 13.55 1/10/2016      150,000       2,500    150,000      2,500  7.25 8.94 41.60 51.34 201.96 200.11 5.35 6.44 10.63 12.71 1/11/2016      150,000       2,500    150,000      2,500  7.06 10.14 40.54 58.22 219.59 201.07 5.28 8.52 11.12 16.85 1/12/2016      150,000       2,500        2,500  6.91   39.70   218.91   4.75   9.98   1/13/2016      150,000       2,500    150,000      2,500  7.33 7.56 42.08 43.43 243.98 207.09 5.02 6.71 11.41 13.56 1/14/2016      150,000       2,500    150,000      2,500  7.22 7.23 41.44 41.52 235.87 241.86 4.81 5.03 10.67 11.36 1/15/2016      150,000       2,500    150,000      2,500  6.91 6.91 39.68 39.67 252.19 256.21 5.06 4.65 11.77 10.96 1/16/2016      150,000       2,500    150,000      2,500  7.08 7.06 40.67 40.53 275.82 245.11 4.63 4.79 11.52 10.93 170  Mill Calculated Ratios - Plant 2 Date Work Index SAG 1     F80   microns  SAG 1     T80   microns  SAG 2     F80   microns  SAG 2     T80   microns  SAG 1      kW-h/t SAG 2     kW-h/t SAG 1   Wio SAG 2  Wio BM 1    P80  microns BM 2    P80  microns BM  1     kW-h/t BM  2     kW-h/t BM 1 Wio BM 2 Wio 1/17/2016      150,000       2,500    150,000      2,500  6.55 7.00 37.60 40.18 267.83 275.45 4.53 4.41 11.03 10.95 1/18/2016      150,000       2,500    150,000      2,500  6.81 7.26 39.07 41.70 256.22 251.10 5.10 37.36 12.02 86.68 1/19/2016      150,000       2,500    150,000      2,500  6.48       237.57   4.73   10.54   1/20/2016      150,000       2,500    150,000      2,500  7.03       236.47   4.85   10.76   1/21/2016      150,000       2,500    150,000      2,500  7.51       202.98   5.24   10.44   1/22/2016      150,000       2,500    150,000      2,500  7.00       243.09   4.68   10.60   1/23/2016      150,000       2,500    150,000      2,500  7.59       238.24   5.67   12.66   1/24/2016      150,000       2,500    150,000      2,500  6.84       256.54   4.83   11.37   1/25/2016      150,000       2,500    150,000      2,500  7.31       251.18   5.00   11.61   1/26/2016      150,000       2,500    150,000      2,500  7.17       251.00   4.53   10.50   1/27/2016      150,000       2,500    150,000      2,500  7.26       258.82   5.02   11.91   1/28/2016      150,000       2,500    150,000      2,500  7.54       244.38   4.94   11.24   1/29/2016      150,000       2,500    150,000      2,500  9.92       204.98   7.77   15.59   1/30/2016      150,000       2,500    150,000      2,500  6.78       264.80   4.55   10.97   1/31/2016      150,000       2,500    150,000      2,500  9.29       207.00   6.63   13.40   2/1/2016      150,000       2,500    150,000      2,500  12.37 14.16 71.03 81.28 151.75 151.86 8.52 9.45 13.93 15.45 171  Mill Calculated Ratios - Plant 2 Date Work Index SAG 1     F80   microns  SAG 1     T80   microns  SAG 2     F80   microns  SAG 2     T80   microns  SAG 1      kW-h/t SAG 2     kW-h/t SAG 1   Wio SAG 2  Wio BM 1    P80  microns BM 2    P80  microns BM  1     kW-h/t BM  2     kW-h/t BM 1 Wio BM 2 Wio 2/2/2016      150,000       2,500    150,000      2,500  10.48 13.95 60.14 80.09 175.81 136.90 6.03 7.66 10.87 11.71 2/3/2016      150,000       2,500    150,000      2,500  9.58 11.87 54.98 68.14 194.60 177.06 6.21 6.76 12.01 12.25 2/4/2016          2,500    150,000      2,500    11.22   64.42   184.89   6.62   12.37 2/5/2016 13.70        2,500    150,000      2,500    9.29   53.35   208.31   5.63   11.41 2/6/2016          2,500    150,000      2,500    9.93   57.00   199.96   6.65   13.11 2/7/2016      150,000       2,500    150,000      2,500  9.66 9.73 55.44 55.88   199.37 7.21 6.07   11.93 2/8/2016      150,000       2,500    150,000      2,500  9.40 10.95 53.96 62.86 193.55 208.86 6.14 6.70 11.83 13.61 2/9/2016      150,000       2,500    150,000      2,500  8.75 10.60 50.26 60.86 205.58 196.87 6.49 6.47 13.04 12.61 2/10/2016      150,000       2,500    150,000      2,500  7.32 8.27 42.02 47.50 240.54   4.76 5.16 10.70   2/11/2016      150,000       2,500    150,000      2,500  7.99 9.23 45.89 52.99 231.40 203.21 6.09 6.10 13.32 12.16 2/12/2016      150,000       2,500    150,000      2,500  7.40 7.93 42.48 45.54 242.40 246.40 4.78 6.20 10.82 14.18 2/13/2016      150,000       2,500    150,000      2,500  8.64 9.92 49.58 56.98 206.91 204.40 5.88 5.83 11.87 11.67 2/14/2016      150,000       2,500    150,000      2,500  6.43 9.96 36.90 57.16 245.65 222.29 4.71 6.29 10.74 13.36 2/15/2016      150,000       2,500    150,000      2,500  7.50 9.36 43.09 53.73 242.14 214.14 5.19 7.27 11.72 15.04 2/16/2016      150,000       2,500    150,000      2,500  8.69 13.39 49.87 76.88 204.66 177.83 5.66 7.06 11.34 12.84 2/17/2016      150,000       2,500    150,000      2,500  8.58 8.29 49.28 47.60 191.38 221.03 5.81 5.21 11.10 11.03 2/18/2016      150,000       2,500    150,000      2,500  8.62 9.10 49.50 52.25 192.23 201.45 5.86 5.90 11.24 11.69 172  Mill Calculated Ratios - Plant 2 Date Work Index SAG 1     F80   microns  SAG 1     T80   microns  SAG 2     F80   microns  SAG 2     T80   microns  SAG 1      kW-h/t SAG 2     kW-h/t SAG 1   Wio SAG 2  Wio BM 1    P80  microns BM 2    P80  microns BM  1     kW-h/t BM  2     kW-h/t BM 1 Wio BM 2 Wio 2/19/2016      150,000       2,500    150,000      2,500  8.66 9.76 49.70 56.02 178.69 181.58 5.69 6.49 10.38 11.97 2/20/2016      150,000       2,500    150,000      2,500  9.56 10.68 54.88 61.34 185.09 186.99 6.35 6.89 11.87 12.96 2/21/2016      150,000       2,500    150,000      2,500  8.19 9.63 47.04 55.30 174.94 186.75 5.91 6.91 10.63 13.00 2/22/2016      150,000       2,500    150,000      2,500  7.61 8.38 43.71 48.08 205.07 178.50 6.45 5.52 12.94 10.06 2/23/2016      150,000       2,500    150,000      2,500  10.20 11.18 58.53 64.18 157.60 190.54 6.56 6.98 10.99 13.31 2/24/2016      150,000       2,500    150,000      2,500  10.37 9.64 59.56 55.35 176.40 186.89 7.25 5.86 13.11 11.02 2/25/2016      150,000       2,500    150,000      2,500  10.98 11.97 63.04 68.71 162.17 158.82 8.37 8.76 14.30 14.76 2/26/2016      150,000       2,500    150,000      2,500  9.73 9.58 55.86 55.01     5.90 5.88     2/27/2016      150,000       2,500    150,000      2,500  10.65 10.56 61.13 60.61 172.79 190.94 6.28 6.07 11.20 11.59 2/28/2016      150,000       2,500    150,000      2,500  9.35 9.72 53.70 55.83 191.92 209.60 5.53 5.77 10.59 11.75 2/29/2016      150,000       2,500    150,000      2,500  9.20 10.22 52.83 58.69     5.92 6.22     3/1/2016 12.28    172,720       2,500     138,938      2,500  9.05 10.15 51.45 58.62 208.46 202.75 5.93 6.87 12.03 13.67 3/2/2016      185,928       2,500        2,500  8.49   48.02   209.11   5.41   11.01   3/3/2016 12.50    158,750       2,500        2,500  8.91   50.96   185.65   6.01   11.26   3/4/2016      146,304       2,500    150,000      2,500  8.82 10.38 50.73 59.59 188.39 169.64 5.50 7.24 10.41 12.76 3/5/2016 13.00    175,387       2,500     110,236      2,500  10.42 8.85 59.19 52.07 167.16 174.50 6.14 5.58 10.71 10.02 173  Mill Calculated Ratios - Plant 2 Date Work Index SAG 1     F80   microns  SAG 1     T80   microns  SAG 2     F80   microns  SAG 2     T80   microns  SAG 1      kW-h/t SAG 2     kW-h/t SAG 1   Wio SAG 2  Wio BM 1    P80  microns BM 2    P80  microns BM  1     kW-h/t BM  2     kW-h/t BM 1 Wio BM 2 Wio 3/6/2016      142,240       2,500     165,354      2,500  10.28 10.29 59.26 58.65 163.09 173.54 5.90 6.33 10.12 11.32 3/7/2016 11.62    179,578       2,500     172,212      2,500  9.97 9.01 56.49 51.21 166.55 181.64 6.29 5.53 10.93 10.20 3/8/2016      180,467       2,500     138,049      2,500  10.80 10.49 61.21 60.62 154.92 172.08 6.32 6.45 10.48 11.48 3/9/2016 12.10    137,668       2,500     126,365      2,500  9.69 9.44 56.01 54.93 162.27 186.76 6.64 5.26 11.35 9.88 3/10/2016      156,972       2,500     170,561      2,500  7.70 8.78 44.05 49.93 174.04 198.35 7.24 5.11 12.98 10.01 3/11/2016 11.09    168,529       2,500     141,859      2,500  7.28 7.91 41.47 45.60 209.99 218.79 4.79 4.56 9.78 9.58 3/12/2016      164,592       2,500     147,320      2,500  7.25 7.55 41.35 43.38 218.26 194.39 4.85 4.58 10.17 8.85 3/13/2016 13.35    150,114       2,500     150,368      2,500  8.15 8.77 46.80 50.36 196.56 222.02 5.10 5.21 9.94 11.06 3/14/2016      159,004       2,500     174,244      2,500  8.95 9.65 51.17 54.82 187.39 195.72 5.67 5.74 10.69 11.16 3/15/2016 10.59    134,112       2,500     188,849      2,500  7.65 8.64 44.30 48.83 199.11 202.35 5.24 5.28 10.30 10.49 3/16/2016          2,500    150,000      2,500    6.98   40.06   242.88   4.34   9.82 3/17/2016 10.71    150,000       2,500    150,000      2,500  6.98 6.67 40.09 38.29 195.97 225.43 5.25 4.10 10.21 8.80 3/18/2016      127,762       2,500     146,558      2,500  6.98 7.51 40.58 43.21 222.83 215.49 4.30 4.44 9.16 9.23 3/19/2016 11.91    178,562       2,500     148,082      2,500  9.25 10.05 52.48 57.75 180.66 182.25 5.23 5.22 9.61 9.64 3/20/2016      148,336       2,500     152,654      2,500  11.14 9.10 64.02 52.18 170.72 196.48 6.28 4.45 11.10 8.68 3/21/2016 11.98    172,212       2,500     122,174      2,500  9.06 9.51 51.53 55.51 183.58 173.29 4.99 4.58 9.27 8.19 174  Mill Calculated Ratios - Plant 2 Date Work Index SAG 1     F80   microns  SAG 1     T80   microns  SAG 2     F80   microns  SAG 2     T80   microns  SAG 1      kW-h/t SAG 2     kW-h/t SAG 1   Wio SAG 2  Wio BM 1    P80  microns BM 2    P80  microns BM  1     kW-h/t BM  2     kW-h/t BM 1 Wio BM 2 Wio 3/22/2016      150,241       2,500        2,500  8.02 7.30 46.03   206.59   4.93 5.85 9.95   3/23/2016 11.82    151,257       2,500     129,413      2,500  9.19 7.67 52.76 44.55 183.51 233.72 5.59 4.37 10.39 9.63 3/24/2016      160,909       2,500     144,399      2,500  6.97 6.70 39.81 38.58 205.62 265.08 4.43 4.28 8.90 10.33 3/25/2016 11.67    212,217       2,500     202,057      2,500  7.56 8.39 42.39 47.19 204.27 226.71 4.62 5.11 9.25 11.01 3/26/2016      149,606       2,500     161,925      2,500  6.16 5.74 35.36 32.80 251.34 274.28 4.09 4.01 9.50 9.94 3/27/2016 12.17    171,196       2,500     136,398      2,500  7.06 6.82 40.16 39.43 243.20 266.84 4.54 4.27 10.29 10.37 3/28/2016      189,484       2,500     225,298      2,500  6.21 6.50 35.07 36.30 232.73 262.29 4.26 4.30 9.35 10.30 3/29/2016 11.79    145,542       2,500     121,920      2,500  6.97 6.74 40.10 39.34 235.87 246.66 4.39 4.27 9.72 9.77 3/30/2016      177,038       2,500     166,878      2,500  8.08 7.85 45.83 44.73 216.73 223.11 4.82 4.70 10.06 10.01 3/31/2016 12.82    157,988       2,500     133,731      2,500  8.99 7.81 51.39 45.26 197.17 227.72 5.50 0.00 10.75 0.00 4/1/2016      133,858       2,500     130,556      2,500  10.56 8.96 61.17 51.97 183.98 210.45 6.79   12.64 0.00 4/2/2016 11.64    176,657       2,500     155,067      2,500  10.13 8.37 57.47 47.95 209.30 187.81 6.57   13.38 0.00 4/3/2016      200,914       2,500     142,367      2,500  9.44 8.45 53.11 48.69 191.52 212.13 6.23   11.92 0.00 4/4/2016 12.83    185,674       2,500     191,262      2,500  10.01 8.17 56.60 46.14 185.02 219.49 6.52   12.19 0.00 4/5/2016          2,500    170,815      2,500    7.59   43.14   218.69       0.00 4/6/2016 13.45    164,338       2,500     150,368      2,500  9.22 7.75 52.57 44.48 194.29 232.68 6.15   11.89 0.00 175  Mill Calculated Ratios - Plant 2 Date Work Index SAG 1     F80   microns  SAG 1     T80   microns  SAG 2     F80   microns  SAG 2     T80   microns  SAG 1      kW-h/t SAG 2     kW-h/t SAG 1   Wio SAG 2  Wio BM 1    P80  microns BM 2    P80  microns BM  1     kW-h/t BM  2     kW-h/t BM 1 Wio BM 2 Wio 4/7/2016      175,006       2,500     158,242      2,500  7.57 7.75 43.01 44.30 209.01 243.62 5.08   10.33 0.00 4/8/2016 12.27    217,170       2,500     176,530      2,500  6.75 6.52 37.83 37.03 240.34 286.24 4.23   9.51 0.00 4/9/2016      176,022       2,500     169,164      2,500  7.28 7.94 41.30 45.22 241.66 244.70 4.41   9.95 0.00 4/10/2016 13.68    184,150       2,500     187,706      2,500  8.00 8.10 45.30 45.76 242.22 286.07 5.70   12.88 0.00 4/11/2016      169,164       2,500     177,292      2,500  6.51 7.39 37.07 41.91 258.22 274.70 5.06   11.97 0.00 4/12/2016 12.90    178,562       2,500     146,431      2,500  6.55 6.58 37.15 37.84 297.24 282.81 5.19   13.65 0.00 4/13/2016      156,464       2,500     161,290      2,500  6.41 5.96 36.69 34.02 269.09 290.01 4.16   10.15 0.00 4/14/2016 12.00    169,418       2,500     152,146      2,500  6.35 5.59 36.17 32.07 259.36 286.52 4.23   10.04 0.00 4/15/2016      198,628       2,500        2,500  7.82 0.00 44.02   242.28 245.00 5.08   11.48 0.00 4/16/2016 12.57    237,744       2,500       92,456      2,500  9.13 6.60 50.88 39.49 215.00 204.15 17.17   35.62 0.00 4/17/2016      144,145       2,500     173,609      2,500  9.51 7.72 54.79 43.85 189.92 235.22 6.12   11.65 0.00 4/18/2016 11.74    168,402       2,500     163,068      2,500  8.97 7.63 51.08 43.53 201.82 242.00 5.72   11.36 0.00 4/19/2016      182,753       2,500     193,802      2,500  8.96 7.49 50.74 42.22 217.85 237.31 5.56   11.65 0.00 4/20/2016 11.44    181,483       2,500     201,422      2,500  7.54 6.66 42.70 37.48 234.57 241.62 4.60   10.15 0.00 4/21/2016      200,152       2,500     203,073      2,500  6.66 6.54 37.49 36.80 248.87 253.73 4.05   9.33 0.00 4/22/2016 11.79    199,898       2,500     160,655      2,500  8.05 6.65 45.29 37.99 207.36 224.69 5.11   10.33 0.00 176  Mill Calculated Ratios - Plant 2 Date Work Index SAG 1     F80   microns  SAG 1     T80   microns  SAG 2     F80   microns  SAG 2     T80   microns  SAG 1      kW-h/t SAG 2     kW-h/t SAG 1   Wio SAG 2  Wio BM 1    P80  microns BM 2    P80  microns BM  1     kW-h/t BM  2     kW-h/t BM 1 Wio BM 2 Wio 4/23/2016      143,764       2,500     204,470      2,500  8.30 6.77 47.81 38.06 234.21 241.64 5.08   11.20 0.00 4/24/2016 13.63    189,738       2,500     207,264      2,500  9.77 8.38 55.17 47.08 210.83 235.73 5.85   11.98 0.00 4/25/2016      202,946       2,500     157,734      2,500  8.41 8.21 47.31 46.96 206.04 226.00 5.92   11.92 0.00 4/26/2016 11.77    169,926       2,500    161,862      2,500  6.93 7.99 39.46 45.64 252.77 231.15 4.43   10.33 0.00 4/27/2016      136,906       2,500     165,989      2,500  5.89 7.98 34.08 45.47 274.74 253.29 3.73   9.24 0.00 4/28/2016 11.70    115,824       2,500     137,033      2,500  6.15 6.55 36.02 37.88 261.11 271.42 3.97   9.48 0.00 4/29/2016      116,078       2,500     122,682      2,500  6.30 6.99 36.93 40.77 270.60 293.79 4.04   9.91 0.00 4/30/2016 12.29    140,208       2,500     158,496      2,500  5.55 6.88 32.01 39.36 277.49 268.45 3.75   9.37 0.00 5/1/2016      168,656       2,500     128,778      2,500  6.19 6.75 35.27 39.23 270.36 276.02 3.88   9.51 0.00 5/2/2016 11.94    137,795       2,500     160,274      2,500    7.25 0.00 41.41 270.69 265.93 10.18   24.97 0.00 5/3/2016      191,897       2,500     193,929      2,500  7.47 8.59 42.19 48.42 252.00 230.59 4.51   10.48 0.00 5/4/2016 12.61    184,912       2,500     201,549      2,500  7.80 7.53 44.12 42.39 226.17 257.97 4.80   10.32 0.00 5/5/2016      161,417       2,500     150,241      2,500  7.20 7.11 41.12 40.83 209.89 250.85 4.46   9.09 0.00 5/6/2016 11.49    268,986       2,500     251,460      2,500  6.55 6.42 36.23 35.68 235.52 242.99 4.53   10.03 0.00 5/7/2016      151,765       2,500     154,559      2,500  6.04 6.59 34.64 37.76 225.30 241.06 4.12   8.83 0.00 5/8/2016 12.09    144,272       2,500     200,406      2,500  6.99 6.48 40.23 36.46 232.91 250.32 4.10   9.00 0.00 177  Mill Calculated Ratios - Plant 2 Date Work Index SAG 1     F80   microns  SAG 1     T80   microns  SAG 2     F80   microns  SAG 2     T80   microns  SAG 1      kW-h/t SAG 2     kW-h/t SAG 1   Wio SAG 2  Wio BM 1    P80  microns BM 2    P80  microns BM  1     kW-h/t BM  2     kW-h/t BM 1 Wio BM 2 Wio 5/9/2016      176,149       2,500     148,971      2,500  6.84 7.00 38.84 40.20 210.36 230.70 4.08   8.34 0.00 5/10/2016 12.88        2,500        2,500    8.31       212.39         5/11/2016      174,498       2,500     201,168      2,500  6.30 6.61 35.76 37.18 219.22 238.74 4.33   9.12 0.00 5/12/2016      220,599       2,500     165,100      2,500  6.50 6.45 36.37 36.78 243.68 235.95 4.03   9.14 0.00 5/13/2016      167,640       2,500     178,816      2,500  6.88 6.57 39.20 37.25 222.31 247.88 4.02   8.54 0.00 5/14/2016 10.08    165,862       2,500     129,921      2,500  5.85 6.57 33.34 38.13 264.91 270.64 3.66   8.84 0.00 5/15/2016      146,431       2,500     143,637      2,500  6.01 6.56 34.56 37.80 256.50 275.11 3.56   8.40 0.00 5/16/2016 12.35    148,209       2,500     133,985      2,500  6.04 6.47 34.68 37.48 266.14 270.53 3.85   9.31 0.00 5/17/2016      152,908       2,500     128,524      2,500  6.03 7.58 34.60 44.06 252.92 243.03 3.79   8.85 0.00 5/18/2016 11.35    163,957       2,500     144,018      2,500  5.62 6.21 32.04 35.76 268.40 281.39 3.61   8.80 0.00 5/19/2016      139,827       2,500     106,680      2,500  5.27 5.77 30.41 34.09 260.50 273.42 3.50   8.34 0.00 5/20/2016 11.34    126,365       2,500     113,792      2,500  5.95 5.95 34.64 34.90 244.63 276.64 3.52   8.02 0.00 5/21/2016      138,684       2,500     130,810      2,500  6.08 5.89 35.14 34.16 253.49 276.10 3.54   8.26 0.00 5/22/2016 11.20    143,256       2,500     102,743      2,500  5.96 6.05 34.36 35.83 252.51 267.02 3.41   7.93 0.00 5/23/2016      150,114       2,500     132,207      2,500  6.17 5.82 35.39 33.72 229.69 266.89 3.69   8.03 0.00 5/24/2016 12.67    199,898       2,500     106,426      2,500  6.21 5.99 34.95 35.35 282.72 255.82 3.40   8.62 0.00 178  Mill Calculated Ratios - Plant 2 Date Work Index SAG 1     F80   microns  SAG 1     T80   microns  SAG 2     F80   microns  SAG 2     T80   microns  SAG 1      kW-h/t SAG 2     kW-h/t SAG 1   Wio SAG 2  Wio BM 1    P80  microns BM 2    P80  microns BM  1     kW-h/t BM  2     kW-h/t BM 1 Wio BM 2 Wio 5/25/2016      171,196       2,500     166,497      2,500  6.03 6.61 34.28 37.65 230.84 268.52 3.11   6.78 0.00 5/26/2016 12.26    210,312       2,500     152,654      2,500  6.41 6.67 35.98 38.25 248.96 236.47 3.31   7.63 0.00 5/27/2016      175,768       2,500     146,939      2,500  6.31 6.54 35.81 37.63 252.49 269.86 3.64   8.48 0.00 5/28/2016 12.61    143,637       2,500     149,352      2,500  6.42 6.50 36.99 37.30 247.86 274.50 3.27   7.52 0.00 5/29/2016      142,875       2,500     148,590      2,500  6.43 6.45 37.03 37.04 244.61 284.28 3.29   7.49 0.00 5/30/2016 14.66    155,067       2,500     160,401      2,500  6.41 6.35 36.70 36.26 223.71 266.67 3.33   7.11 0.00 5/31/2016      153,670       2,500     163,195      2,500  6.14 6.31 35.21 36.03 251.68 271.25 3.56   8.26 0.00 6/1/2016          2,500    167,640      2,500  6.25 6.18   35.20 235.04 291.58 4.67   10.33 0.00 6/2/2016      170,053       2,500        2,500  6.28 6.58 35.75   235.00 291.58 3.73   8.25 0.00 6/3/2016      155,067       2,500     172,085      2,500  6.36 7.06 36.42 40.16 235.00 291.58 3.83   8.46 0.00 6/4/2016      167,386       2,500     147,447      2,500  7.12 7.92 40.54 45.53 235.00 291.58 4.31   9.52 0.00 6/5/2016      162,306       2,500     144,780      2,500  7.77 7.51 44.36 43.22 235.00 291.58 4.76   10.52 0.00 6/6/2016      158,242       2,500     138,430      2,500  8.21 8.03 46.95 46.39 235.00 291.58 5.14   11.37 0.00 6/7/2016      161,989       2,500    144,590      2,500  6.46 6.29 36.89 36.19 235.00 291.58 4.04   8.93 0.00 6/8/2016      165,735       2,500     150,749      2,500  6.11 6.04 34.85 34.65 235.00 291.58 3.84   8.48 0.00 6/9/2016      152,273       2,500     129,032      2,500  7.28 6.56 41.75 38.12 235.00 291.58 4.29   9.49 0.00 179  Mill Calculated Ratios - Plant 2 Date Work Index SAG 1     F80   microns  SAG 1     T80   microns  SAG 2     F80   microns  SAG 2     T80   microns  SAG 1      kW-h/t SAG 2     kW-h/t SAG 1   Wio SAG 2  Wio BM 1    P80  microns BM 2    P80  microns BM  1     kW-h/t BM  2     kW-h/t BM 1 Wio BM 2 Wio 6/10/2016      165,354       2,500     142,875      2,500  8.78 7.76 50.03 44.69 235.00 291.58 5.37   11.88 0.00 6/11/2016      198,501       2,500     156,718      2,500  7.84 6.73 44.13 38.52 235.00 291.58 4.97   10.99 0.00 6/12/2016      180,213       2,500     128,397      2,500  8.14 6.78 46.16 39.39 235.00 291.58 4.95   10.93 0.00 6/13/2016      162,306       2,500     149,860      2,500  8.15 7.17 46.51 41.16 235.00 291.58 5.00   11.06 0.00 6/14/2016      193,802       2,500     179,578      2,500  8.07 8.18 45.49 46.36 235.00 291.58 4.99   11.03 0.00 6/15/2016      147,701       2,500     150,114      2,500  7.96 9.50 45.72 54.56 235.00 291.58 4.88   10.79 0.00 6/16/2016      155,067       2,500     150,114      2,500  6.79 8.07 38.88 46.35 235.00 291.58 4.15   9.18 0.00 6/17/2016      152,019       2,500     152,146      2,500  7.09 7.26 40.67 41.65 235.00 291.58 4.54   10.04 0.00 6/18/2016      149,606       2,500     150,241      2,500  6.51 6.45 37.38 37.05 235.00 291.58 4.02   8.88 0.00 6/19/2016      144,145       2,500     148,844      2,500  6.72 6.52 38.72 37.47 235.00 291.58 4.34   9.59 0.00 6/20/2016      159,004       2,500     159,385      2,500  7.22 7.17 41.25 40.98 235.00 291.58 4.35   9.61 0.00 6/21/2016      143,637       2,500     148,082      2,500  7.96 7.35 45.87 42.24 235.00 291.58 4.90   10.82 0.00 6/22/2016      150,241       2,500     149,098      2,500  7.35 7.62 42.19 43.74 235.00 291.58 4.53   10.03 0.00 6/23/2016      132,334       2,500     130,810      2,500  6.89 7.41 39.91 42.99 235.00 291.58 4.28   9.46 0.00 6/24/2016      151,003       2,500     148,717      2,500  7.48 6.99 42.93 40.18 235.00 291.58 4.63   10.23 0.00 6/25/2016      170,434       2,500     171,450      2,500  7.51 7.19 42.75 40.89 235.00 291.58 4.55   10.05 0.00 180  Mill Calculated Ratios - Plant 2 Date Work Index SAG 1     F80   microns  SAG 1     T80   microns  SAG 2     F80   microns  SAG 2     T80   microns  SAG 1      kW-h/t SAG 2     kW-h/t SAG 1   Wio SAG 2  Wio BM 1    P80  microns BM 2    P80  microns BM  1     kW-h/t BM  2     kW-h/t BM 1 Wio BM 2 Wio 6/26/2016      134,874       2,500     135,890      2,500  6.88 7.21 39.84 41.72 235.00 291.58 4.06   8.98 0.00 6/27/2016      155,702       2,500     156,210      2,500  6.84 6.89 39.15 39.46 235.00 291.58 4.07   9.00 0.00 6/28/2016      155,829       2,500     155,194      2,500  7.06 7.00 40.42 40.07 235.00 291.58 4.06   8.98 0.00 6/29/2016      128,143       2,500     128,397      2,500  6.52 6.72 37.88 39.07 235.00 291.58 3.79   8.38 0.00 6/30/2016      138,049       2,500     140,843      2,500  6.85 7.04 39.57 40.60 235.00 291.58 4.04   8.93 0.00 7/1/2016      142,748       2,500     139,446      2,500  7.44 7.33 42.88 42.33 235.00 291.58 4.48   9.91 0.00 7/2/2016      159,131       2,500     148,717      2,500  6.57 6.72 37.54 38.62 235.00 291.58 3.91   8.65 0.00 7/3/2016      136,398       2,500     141,732      2,500  7.38 7.88 42.65 45.44 235.00 291.58 4.69   10.38 0.00 7/4/2016      147,003       2,500    153,861      2,500  6.93 6.50 39.83 37.26 235.00 291.58 5.43   12.00 0.00 7/5/2016      157,607       2,500     165,989      2,500  6.78 6.64 38.80 37.82 235.00 291.58 3.99   8.82 0.00 7/6/2016      142,494       2,500     134,112      2,500  6.37 6.84 36.71 39.60 235.00 291.58 3.93   8.70 0.00 7/7/2016      178,054       2,500     164,211      2,500  6.58 6.59 37.35 37.57 252.51 282.29 4.01   9.34 0.00 7/8/2016 11.81    170,307       2,500     146,050      2,500  6.81 6.50 38.75 37.41 239.90 243.57 3.83   8.59 0.00 7/9/2016          2,500    145,606      2,500  6.98 6.94   39.93   254.68 9.55       7/10/2016 13.73    157,734       2,500     145,161      2,500  7.40 7.22 42.31 41.57 261.04 258.33 4.42   10.54 0.00 7/11/2016      143,129       2,500     144,018      2,500  6.86 7.41 39.53 42.69 256.91 243.31 3.93   9.27 0.00 181  Mill Calculated Ratios - Plant 2 Date Work Index SAG 1     F80   microns  SAG 1     T80   microns  SAG 2     F80   microns  SAG 2     T80   microns  SAG 1      kW-h/t SAG 2     kW-h/t SAG 1   Wio SAG 2  Wio BM 1    P80  microns BM 2    P80  microns BM  1     kW-h/t BM  2     kW-h/t BM 1 Wio BM 2 Wio 7/12/2016 13.30    145,669       2,500     145,415      2,500  6.44 6.70 37.08 38.55 239.55 266.25 3.82   8.56 0.00 7/13/2016      168,402       2,500     167,005      2,500  6.68 7.45 38.05 42.44 267.64 234.47 3.93   9.54 0.00 7/14/2016 12.29    140,208       2,500     139,573      2,500  7.30 7.90 42.15 45.62 267.70 234.78 4.41   10.73 0.00 7/15/2016      141,224       2,500     142,240      2,500  7.00 7.15 40.38 41.19 228.98 224.54 4.35   9.44 0.00 7/16/2016 12.26    133,604       2,500     134,493      2,500  6.80 6.94 39.39 40.18 256.78 246.41 4.07   9.60 0.00 7/17/2016      138,938       2,500     138,430      2,500  7.57 7.33 43.69 42.35 251.69 269.04 4.88   11.35 0.00 7/18/2016 13.65    138,811       2,500     139,827      2,500  7.29 7.94 42.10 45.82 248.69 251.05 4.52   10.41 0.00 7/19/2016      157,226       2,500        2,500  7.11   40.67   270.64   4.36   10.69   7/20/2016 13.39    175,641       2,500        2,500  9.02 10.27 51.20   214.37   5.93   12.27   7/21/2016          2,500    157,036      2,500    8.09   46.27   198.21         7/22/2016 12.59        2,500    165,640      2,500  7.36 8.73   49.78 231.61 217.78 4.53   9.91 0.00 7/23/2016      189,230       2,500     174,244      2,500  6.46 8.18 36.51 46.49 263.56 219.66 4.00   9.62 0.00 7/24/2016 12.58    183,134       2,500     190,119      2,500  6.66 7.75 37.72 43.78 257.48 218.44 3.95   9.33 0.00 7/25/2016      171,450       2,500     154,813      2,500  7.14 8.75 40.62 50.11 253.97 205.72 4.25   9.95 0.00 7/26/2016 13.53    206,629       2,500     177,419      2,500  6.75 7.51 37.92 42.62 262.96 216.66 4.16   9.99 0.00 7/27/2016      183,134       2,500     157,480      2,500  6.80 7.85 38.51 44.90 320.33 252.20 4.51   12.58 0.00 182  Mill Calculated Ratios - Plant 2 Date Work Index SAG 1     F80   microns  SAG 1     T80   microns  SAG 2     F80   microns  SAG 2     T80   microns  SAG 1      kW-h/t SAG 2     kW-h/t SAG 1   Wio SAG 2  Wio BM 1    P80  microns BM 2    P80  microns BM  1     kW-h/t BM  2     kW-h/t BM 1 Wio BM 2 Wio 7/28/2016 12.96    185,928       2,500    165,799      2,500  6.77 8.06 38.27 45.97 255.71 241.13 4.03   9.48 0.00 7/29/2016      188,722       2,500     174,117      2,500  7.05 7.94 39.86 45.11 299.05 266.86 4.20 4.67 11.10 11.33 7/30/2016 11.12    163,195       2,500     163,195      2,500  6.71 6.97 38.29 39.78 297.58 266.08 4.10 4.33 10.79 10.48 7/31/2016      153,035       2,500     152,527      2,500  6.05 6.59 34.71 37.78 291.94 275.31 3.98 4.17 10.33 10.36 8/1/2016 12.31    131,445       2,500     131,064      2,500  6.76 8.11 39.21 47.03 290.48 259.44 4.23 5.02 10.93 11.93 8/2/2016      138,938       2,500     137,414      2,500  6.49 7.09 37.47 40.97 286.44 248.29 4.02 4.33 10.28 9.97 8/3/2016 12.46    138,938       2,500     142,113      2,500  6.67 7.03 38.53 40.53 277.18 275.31 4.07 4.25 10.15 10.55 8/4/2016      140,843       2,500     142,367      2,500  6.85 7.53 39.50 43.43 274.88 261.91 4.07 4.61 10.10 11.02 8/5/2016 13.03    137,160       2,500     130,937      2,500  6.66 7.09 38.50 41.12 275.09 265.73 3.80 4.35 9.44 10.52 8/6/2016      162,052       2,500     159,258      2,500  6.76 7.46 38.57 42.67 270.75 271.32 3.74 4.61 9.18 11.32 8/7/2016 13.57    147,828       2,500     153,289      2,500  6.45 7.11 37.06 40.75 289.93 256.11 3.78 4.48 9.76 10.54 8/8/2016          2,500    157,861      2,500    8.75   50.06   215.95   5.46   11.36 8/9/2016 13.04        2,500    157,861      2,500    10.00   57.19   185.50   6.89   12.91 8/10/2016          2,500    157,861      2,500  0.00 8.80   50.32   200.57 0.00 5.81   11.48 8/11/2016 13.40        2,500    157,861      2,500  7.26 7.94   45.43 249.00 234.70 5.01 5.43 11.55 12.00 8/12/2016      164,211       2,500     162,433      2,500  6.27 6.81 35.75 38.87 287.73 270.28 3.98 4.23 10.21 10.37 8/13/2016 13.49    155,829       2,500     157,734      2,500  6.07 6.90 34.75 39.44 315.96 286.73 3.84 4.15 10.59 10.63 183  Mill Calculated Ratios - Plant 2 Date Work Index SAG 1     F80   microns  SAG 1     T80   microns  SAG 2     F80   microns  SAG 2     T80   microns  SAG 1      kW-h/t SAG 2     kW-h/t SAG 1   Wio SAG 2  Wio BM 1    P80  microns BM 2    P80  microns BM  1     kW-h/t BM  2     kW-h/t BM 1 Wio BM 2 Wio 8/14/2016      171,450       2,500     149,606      2,500  6.13 6.96 34.84 39.96 315.35 280.83 3.79 4.14 10.43 10.45 8/15/2016 12.29    205,105       2,500     187,452      2,500  6.38 7.31 35.85 41.33 306.57 281.89 3.89 4.29 10.48 10.85 8/16/2016      136,906       2,500     160,274      2,500  6.17 8.04 35.67 45.95 286.99 264.00 4.70 5.04 12.03 12.14 8/17/2016 12.50    168,783       2,500     136,398      2,500  5.99 7.45 34.10 43.07 310.89 245.67 3.68 4.27 10.02 9.74 8/18/2016      174,879       2,500     141,986      2,500  6.20 7.03 35.22 40.51 301.59 259.28 3.69 3.99 9.82 9.49 8/19/2016 12.70    138,430       2,500     159,258      2,500  6.00 7.17 34.69 40.97 295.27 280.74 3.64 5.34 9.52 13.46 8/20/2016      123,571       2,500     153,924      2,500  5.60 7.91 32.66 45.31 304.83 255.39 3.51 5.46 9.42 12.83 8/21/2016 13.34    138,811       2,500     151,130      2,500  5.78 7.00 33.37 40.15 321.10 245.84 3.80 4.35 10.60 9.94 8/22/2016      149,098       2,500     140,335      2,500  6.25 7.03 35.91 40.55 272.60 239.78 4.29 4.55 10.57 10.21 8/23/2016 12.04    138,684       2,500     151,892      2,500  6.11 8.65 35.28 49.59 288.93 204.42 3.81 5.41 9.81 10.84 8/24/2016      132,207       2,500     142,621      2,500  5.70 6.59 33.06 37.96 295.07 228.11 3.80 4.90 9.95 10.60 8/25/2016 12.38    146,939       2,500     147,955      2,500  5.43 5.82 31.25 33.47 327.64 266.86 3.84 4.42 10.90 10.73 8/26/2016      140,589       2,500     144,526      2,500  5.90 6.63 34.02 38.16 331.57 264.50 4.00 4.56 11.45 10.98 8/27/2016 14.18    144,145       2,500     148,717      2,500  6.79 7.26 39.10 41.68 260.80 225.48 4.66 5.18 11.12 11.11 8/28/2016      160,401       2,500     156,591      2,500  6.23 6.44 35.57 36.84 290.45 253.56 4.27 4.47 11.05 10.45 8/29/2016      213,233       2,500     158,623      2,500  6.25 6.09 35.03 34.80 298.71 330.52 4.49 5.41 11.86 15.45 184  Mill Calculated Ratios - Plant 2 Date Work Index SAG 1     F80   microns  SAG 1     T80   microns  SAG 2     F80   microns  SAG 2     T80   microns  SAG 1      kW-h/t SAG 2     kW-h/t SAG 1   Wio SAG 2  Wio BM 1    P80  microns BM 2    P80  microns BM  1     kW-h/t BM  2     kW-h/t BM 1 Wio BM 2 Wio 8/30/2016      131,953       2,500     149,352      2,500  5.94 6.24 34.43 35.83 289.40 226.61 4.50 4.51 11.60 9.72 8/31/2016      142,113       2,500     135,128      2,500  5.84 5.85 33.65 33.88 306.62 278.84 3.97 4.11 10.69 10.31 9/1/2016      178,816       2,500     182,880      2,500  7.55 8.50 42.81 48.11 265.44 215.20 5.17 5.55 12.51 11.52 9/2/2016      150,749       2,500     142,113      2,500  5.89 7.01 33.80 40.40 305.46 233.22 4.14 4.48 11.13 9.86 9/3/2016      169,291       2,500     179,197      2,500  5.90 6.77 33.56 38.37 306.40 253.02 3.91 4.36 10.54 10.16 9/4/2016      169,291       2,500     179,197      2,500  6.01 6.47 34.18 36.69 319.53 272.75 4.02 4.20 11.20 10.36 9/5/2016      179,959       2,500     146,431      2,500  6.64 6.82 37.61 39.20 268.41 227.93 4.46 5.62 10.87 12.16 9/6/2016      169,164       2,500     175,387      2,500  6.00 6.16 34.13 34.97 268.25 234.04 4.19 4.16 10.22 9.17 9/7/2016      190,119       2,500     166,751      2,500  6.93 8.15 39.15 46.42 315.92 274.50 4.69 5.40 12.94 13.39 9/8/2016      148,082       2,500     136,906      2,500  6.33 6.52 36.40 37.71 312.13 294.83 4.19 4.30 11.44 11.25 9/9/2016      138,684       2,500     143,510      2,500  6.31 7.06 36.45 40.65 323.01 303.45 4.26 4.84 11.94 12.93 9/10/2016      139,954       2,500     151,511      2,500  6.28 6.94 36.22 39.83 357.41 273.77 4.11 4.51 12.49 11.17 9/11/2016      156,591       2,500     131,318      2,500  6.96 7.16 39.81 41.53 313.03 293.27 4.83 4.74 13.22 12.35 9/12/2016      148,717       2,500     170,561      2,500  6.87 8.76 39.46 49.84 256.47 208.66 4.40 5.46 10.36 11.09 9/13/2016      138,938       2,500     161,036      2,500  6.92 7.98 39.97 45.60 276.92 221.38 4.65 5.14 11.60 10.89 9/14/2016      140,208       2,500     159,512      2,500  5.88 6.34 33.95 36.22 324.86 270.71 4.34 4.28 12.23 10.49 185  Mill Calculated Ratios - Plant 2 Date Work Index SAG 1     F80   microns  SAG 1     T80   microns  SAG 2     F80   microns  SAG 2     T80   microns  SAG 1      kW-h/t SAG 2     kW-h/t SAG 1   Wio SAG 2  Wio BM 1    P80  microns BM 2    P80  microns BM  1     kW-h/t BM  2     kW-h/t BM 1 Wio BM 2 Wio 9/15/2016      137,033       2,500     160,782      2,500  6.22 7.06 35.94 40.30 328.99 270.92 4.22 4.48 12.02 11.00 9/16/2016      141,224       2,500     164,211      2,500  6.40 6.94 36.93 39.61 292.43 239.51 4.59 4.64 11.93 10.40 9/17/2016          2,500        2,500  0.00 0.00         9.71 0.39     9/18/2016          2,500        2,500  7.43           4.56       9/19/2016      127,762       2,500        2,500  7.27 0.00 42.28   255.43   4.42 0.00 10.38   9/20/2016      136,144       2,500     135,636      2,500  6.34 8.61 36.67 49.83 299.12 207.31 3.86 6.82 10.19 13.79 9/21/2016      150,876       2,500     131,382      2,500  6.19 7.52 35.53 43.62 319.06 240.35 3.65 5.18 10.15 11.64 9/22/2016      135,763       2,500     127,127      2,500  6.19 6.83 35.80 39.70 314.94 254.21 3.55 4.44 9.77 10.40 9/23/2016      148,209       2,500     128,905      2,500  6.42 6.67 36.90 38.76 307.35 257.30 3.36 4.67 9.07 11.02 9/24/2016      138,621       2,500     129,032      2,500  7.03 6.98 40.60 40.56 288.92 280.33 3.55 4.06 9.14 10.22 9/25/2016      131,953       2,500     140,907      2,500  6.44 6.35 37.37 36.62 322.67 295.15 3.48 3.89 9.75 10.19 9/26/2016      169,037       2,500     181,610      2,500  6.21 5.81 35.37 32.94 323.25 290.43 3.48 3.63 9.78 9.39 9/27/2016      141,478       2,500     128,397      2,500  6.38 5.99 36.77 34.79 327.38 298.77 3.55 3.73 10.05 9.84 9/28/2016      145,479       2,500     139,446      2,500  6.63 6.36 38.12 36.73 360.67 297.82 3.61 3.88 11.07 10.24 9/29/2016      147,701       2,500     150,749      2,500  7.17 6.77 41.24 38.88 340.40 290.88 4.04 4.12 11.81 10.68 9/30/2016      143,891       2,500     151,892      2,500  6.16 6.20 35.49 35.55 335.78 299.26 3.52 3.89 10.18 10.30 186  Mill Calculated Ratios - Plant 2 Date Work Index SAG 1     F80   microns  SAG 1     T80   microns  SAG 2     F80   microns  SAG 2     T80   microns  SAG 1      kW-h/t SAG 2     kW-h/t SAG 1   Wio SAG 2  Wio BM 1    P80  microns BM 2    P80  microns BM  1     kW-h/t BM  2     kW-h/t BM 1 Wio BM 2 Wio 10/1/2016      138,049       2,500     133,731      2,500  6.74 6.43 38.92 37.22 316.70 302.74 4.02 3.91 11.12 10.45 10/2/2016      136,525       2,500     141,986      2,500  6.41 6.33 37.09 36.49 306.41 265.44 3.85 3.98 10.38 9.62 10/3/2016      134,747       2,500     143,637      2,500  6.43 6.68 37.20 38.47 303.21 291.72 3.92 4.99 10.49 12.95 10/4/2016      145,923       2,500     138,303      2,500  7.16 6.27 41.18 36.21 303.21 297.34 5.24 4.20 14.00 11.05 10/5/2016      150,559       2,500     152,273      2,500  7.34 7.36 42.15 42.19 274.15 284.78 4.91 4.69 12.15 11.94 10/6/2016      154,750       2,500     158,877      2,500  6.76 7.22 38.74 41.30 294.53 266.76 4.37 4.76 11.42 11.54 10/7/2016      133,858       2,500     136,779      2,500  7.14 6.99 41.33 40.39 293.29 265.60 4.53 4.51 11.80 10.91 10/8/2016      143,764       2,500     139,192      2,500  7.32 7.66 42.16 44.23 289.15 275.79 4.49 4.79 11.58 11.90 10/9/2016      172,276       2,500     141,097      2,500  6.89 6.98 39.18 40.25 324.24 308.64 4.25 4.45 11.95 12.06 10/10/2016      202,946       2,500     175,133      2,500  6.97 6.58 39.19 37.35     4.29 5.37     10/11/2016      172,339       2,500     191,643      2,500  6.99 6.76 39.73 38.15 308.74 286.42 5.47 4.45 14.83 11.40 10/12/2016      206,375       2,500     150,686      2,500  6.98 7.39 39.22 42.40 316.09 273.17 4.16 4.81 11.46 11.87 10/13/2016      161,671       2,500     140,462      2,500  6.88 6.99 39.26 40.31 306.64 283.40 4.00 4.55 10.79 11.55 10/14/2016      152,654       2,500     136,525      2,500  6.93 6.76 39.72 39.08 293.39 223.14 5.32 4.45 13.87 9.48 10/15/2016      175,514       2,500     145,288      2,500  6.87 6.73 38.98 38.71 332.81 286.52 4.09 4.41 11.75 11.29 10/16/2016      191,834       2,500     181,293      2,500  7.30 6.81 41.18 38.56 281.37 270.62 4.69 4.60 11.83 11.27 187  Mill Calculated Ratios - Plant 2 Date Work Index SAG 1     F80   microns  SAG 1     T80   microns  SAG 2     F80   microns  SAG 2     T80   microns  SAG 1      kW-h/t SAG 2     kW-h/t SAG 1   Wio SAG 2  Wio BM 1    P80  microns BM 2    P80  microns BM  1     kW-h/t BM  2     kW-h/t BM 1 Wio BM 2 Wio 10/17/2016      195,898       2,500     172,720      2,500  6.14 6.40 34.62 36.36 314.37 303.35 3.81 4.36 10.47 11.66 10/18/2016      187,706       2,500     115,316      2,500  6.63 6.78 37.47 39.73     4.03 4.52     10/19/2016          2,500    128,492      2,500  7.52 7.24   42.06     4.54 4.92     10/20/2016      160,401       2,500     141,669      2,500  7.67 7.52 43.80 43.38     4.66 5.05     10/21/2016      153,734       2,500     145,987      2,500  7.55 7.63 43.29 43.87 267.31 277.16 4.61 5.07 11.20 12.66 10/22/2016      170,752       2,500     168,466      2,500  7.24 7.10 41.16 40.45 300.40 307.26 4.58 4.79 12.15 12.93 10/23/2016      145,542       2,500     174,371      2,500  6.87 8.02 39.53 45.53 283.78 262.49 4.23 5.25 10.74 12.59 10/24/2016      149,225       2,500     133,731      2,500  6.89 7.17 39.55 41.51 284.69 272.85 4.13 4.57 10.51 11.27 10/25/2016      155,893       2,500     153,734      2,500  6.87 7.13 39.32 40.86 305.30 288.75 4.05 4.54 10.87 11.69 10/26/2016      141,478       2,500     144,971      2,500  6.78 7.11 39.07 40.91 275.54 260.90 4.06 4.55 10.10 10.85 10/27/2016      133,858       2,500     131,191      2,500  7.51 7.41 43.49 42.96 282.07 284.24 4.69 4.85 11.86 12.34 10/28/2016      158,433       2,500     155,448      2,500  7.58 7.48 43.36 42.82 278.47 275.28 4.50 4.74 11.27 11.77 10/29/2016      102,680       2,500     130,683      2,500  7.12 7.32 42.20 42.48 280.99 264.25 4.43 4.51 11.16 10.87 10/30/2016 14.52    156,718       2,500     132,207      2,500  8.26 7.81 47.29 45.27 258.29 264.35 5.14 4.78 12.17 11.51 10/31/2016      144,526       2,500     148,082      2,500  8.03 7.82 46.21 44.95 240.71 236.61 5.20 4.79 11.71 10.64 11/1/2016 13.67    158,814       2,500     142,177      2,500  7.10 8.20 40.61 47.28 256.69 253.66 4.47 5.06 10.54 11.83 188  Mill Calculated Ratios - Plant 2 Date Work Index SAG 1     F80   microns  SAG 1     T80   microns  SAG 2     F80   microns  SAG 2     T80   microns  SAG 1      kW-h/t SAG 2     kW-h/t SAG 1   Wio SAG 2  Wio BM 1    P80  microns BM 2    P80  microns BM  1     kW-h/t BM  2     kW-h/t BM 1 Wio BM 2 Wio 11/2/2016      144,780       2,500    157,353      2,500  6.41 7.76 36.88 44.37 236.52 259.24 3.83 7.27 8.50 17.27 11/3/2016 13.49    177,610       2,500     172,530      2,500  6.82 6.42 38.70 36.47 260.48 250.43 4.35 4.14 10.36 9.58 11/4/2016      172,212       2,500     138,811      2,500  6.56 6.40 37.28 36.96     4.20 4.00     11/5/2016      156,528       2,500     139,573      2,500  6.54 6.38 37.43 36.81 277.64 269.95 4.40 4.13 10.99 10.09 11/6/2016          2,500    162,401      2,500    9.48   54.09   209.26   6.02   12.25 11/7/2016      154,432       2,500     185,230      2,500  9.37 13.45 53.66 76.10 190.10 144.93 10.98 9.18 20.90 14.56 11/8/2016      138,811       2,500     172,022      2,500  7.60 20.32 43.90 115.55 218.36 158.26 4.88 13.84 10.23 23.27 11/9/2016      136,017       2,500     186,055      2,500  6.34 9.63 36.66 54.46 258.18 216.58 4.32 6.34 10.24 13.23 11/10/2016      141,542       2,500     162,624      2,500  6.27 6.71 36.13 38.31 278.50 286.01 4.36 4.53 10.91 11.57 11/11/2016      140,526       2,500     145,860      2,500  6.78 6.93 39.14 39.88 268.30 267.77 4.35 4.44 10.61 10.79 11/12/2016      140,081       2,500     135,763      2,500  6.80 6.27 39.23 36.26 272.82 263.65 4.39 4.31 10.83 10.37 11/13/2016      160,909       2,500     144,653      2,500  7.39 6.91 42.21 39.78 232.70 252.71 4.89 4.49 10.74 10.47 11/14/2016      164,211       2,500     171,831      2,500  7.66 7.07 43.68 40.17 240.11 244.28 4.92 4.43 11.05 10.08 11/15/2016 14.54    187,706       2,500     159,639      2,500  7.97 7.42 45.04 42.39 245.14 254.74 5.05 4.63 11.52 10.84 11/16/2016      190,945       2,500     132,207      2,500  8.19 6.56 46.22 38.02 244.06 253.99 5.18 4.08 11.77 9.55 11/17/2016 14.98    152,908       2,500     135,001      2,500  8.10 6.90 46.41 39.93 234.97 245.92 5.30 4.39 11.72 10.02 189  Mill Calculated Ratios - Plant 2 Date Work Index SAG 1     F80   microns  SAG 1     T80   microns  SAG 2     F80   microns  SAG 2     T80   microns  SAG 1      kW-h/t SAG 2     kW-h/t SAG 1   Wio SAG 2  Wio BM 1    P80  microns BM 2    P80  microns BM  1     kW-h/t BM  2     kW-h/t BM 1 Wio BM 2 Wio 11/18/2016      162,306       2,500     127,445      2,500  8.09 6.39 46.17 37.13 233.09 248.68 5.65 4.41 12.42 10.15 11/19/2016 14.21    160,719       2,500     138,811      2,500  7.74 6.90 44.21 39.85 254.96 250.43 4.83 6.04 11.34 13.98 11/20/2016      151,829       2,500     159,957      2,500  7.35 6.46 42.16 36.94 247.25 245.36 4.55 4.25 10.44 9.70 11/21/2016 14.08    187,833       2,500     139,192      2,500  8.14 7.20 46.03 41.59 256.80 267.65 5.32 5.47 12.54 13.31 11/22/2016      198,311       2,500     172,911      2,500  7.29 7.09 41.08 40.28 249.28 242.03 4.71 4.88 10.87 11.03 11/23/2016 14.10    144,653       2,500     115,570      2,500  6.52 7.26 37.55 42.54 229.47 233.28 4.21 6.53 9.15 14.35 11/24/2016      148,082       2,500     170,053      2,500  6.94 9.48 39.86 53.93 249.31 218.00 4.37 6.89 10.09 14.44 11/25/2016 13.10    153,607       2,500     175,832      2,500  6.72 8.85 38.54 50.25 263.73 240.54 4.33 6.42 10.41 14.44 11/26/2016      126,937       2,500     153,035      2,500  6.58 7.41 38.29 42.48 257.04 283.19 3.94 6.89 9.31 17.48 11/27/2016 12.90    140,780       2,500     153,226      2,500  7.01 6.95 40.42 39.82 270.83 246.92 4.41 4.86 10.82 11.15 11/28/2016      139,065       2,500     154,813      2,500  7.21 6.95 41.64 39.80 265.27 249.82 4.60 5.16 11.11 11.91 11/29/2016 12.45    143,066       2,500     158,623      2,500  6.92 7.18 39.86 41.06 279.60 266.68 4.40 4.89 11.06 11.86 11/30/2016      146,368       2,500     155,448      2,500  7.16 7.18 41.16 41.09 254.61 243.15 4.54 5.37 10.63 12.18 12/1/2016 11.75    145,542       2,500     156,591      2,500  7.33 7.47 42.17 42.77 247.32 229.09 4.65 5.67 10.66 12.32 12/2/2016      158,306       2,500     153,035      2,500  7.74 7.22 44.24 41.40 231.67 228.56 4.90 5.03 10.72 10.89 12/3/2016      172,085       2,500     187,579      2,500  7.57 7.39 43.05 41.79 252.27 229.27 4.71 5.07 10.96 11.02 190  Mill Calculated Ratios - Plant 2 Date Work Index SAG 1     F80   microns  SAG 1     T80   microns  SAG 2     F80   microns  SAG 2     T80   microns  SAG 1      kW-h/t SAG 2     kW-h/t SAG 1   Wio SAG 2  Wio BM 1    P80  microns BM 2    P80  microns BM  1     kW-h/t BM  2     kW-h/t BM 1 Wio BM 2 Wio 12/4/2016      156,274       2,500     159,195      2,500  8.33 7.75 47.69 44.32 243.01 228.22 5.33 5.59 12.07 12.11 12/5/2016      198,120       2,500        2,500  8.47   47.69       6.20       12/6/2016          2,500        2,500  10.13           8.27       12/7/2016 13.92        2,500        2,500    9.91       193.95   7.18   13.85 12/8/2016      177,800       2,500     148,844      2,500  8.86 13.20 50.26 75.85 239.00 228.45 7.92 8.77 17.73 19.00 12/9/2016 13.77    155,829       2,500     167,132      2,500  17.63 16.99 100.93 96.80 247.52 238.96 10.80 11.16 24.78 24.97 12/10/2016      170,625       2,500     149,416      2,500  17.09 16.28 97.22 93.47 235.03 230.52 10.44 10.51 23.08 22.91 12/11/2016 14.28    156,337       2,500     136,271      2,500  16.85 15.42 96.44 89.15 225.24 227.40 10.32 10.16 22.14 21.94 12/12/2016      162,560       2,500     134,303      2,500    15.27 0.00 88.39 236.57 237.09   9.61 0.00 21.37 12/13/2016      139,573       2,500     140,208      2,500  14.95 13.41 86.28 77.37 253.52 253.67 8.93 8.27 20.87 19.32 12/14/2016 13.53    156,591       2,500     118,745      2,500  7.20 12.34 41.21 72.18 254.52 239.12 4.31 7.82 10.10 17.51 12/15/2016      140,081       2,500     123,190      2,500  7.29 6.98 42.09 40.70     4.31 4.22     12/16/2016 12.18    156,337       2,500     130,937      2,500  7.34 6.84 41.99 39.68 263.12 247.13 4.30 4.12 10.33 9.45 12/17/2016      157,544       2,500     149,225      2,500  7.82 7.01 44.72 40.25 254.73 245.75 4.68 4.29 10.97 9.80 12/18/2016 12.22    154,178       2,500     143,383      2,500  8.12 6.99 46.53 40.25 230.26 241.50 4.81 4.06 10.48 9.16 12/19/2016      145,796       2,500     142,748      2,500  7.46 6.78 42.95 39.06 275.90 245.53 4.42 3.93 10.98 8.96 191  Mill Calculated Ratios - Plant 2 Date Work Index SAG 1     F80   microns  SAG 1     T80   microns  SAG 2     F80   microns  SAG 2     T80   microns  SAG 1      kW-h/t SAG 2     kW-h/t SAG 1   Wio SAG 2  Wio BM 1    P80  microns BM 2    P80  microns BM  1     kW-h/t BM  2     kW-h/t BM 1 Wio BM 2 Wio 12/20/2016 13.22    172,530       2,500     149,733      2,500  7.57 6.70 43.01 38.46 241.10 245.13 4.50 3.94 10.13 8.97 12/21/2016      136,779       2,500     136,843      2,500  6.77 6.38 39.13 36.90 256.17 264.71 5.48 3.92 12.89 9.45 12/22/2016 13.70    169,926       2,500     166,624      2,500  7.63 7.90 43.41 45.02 257.04 223.13 4.42 4.64 10.42 9.88 12/23/2016      149,987       2,500     147,193      2,500  7.71 8.66 44.25 49.80 271.71 247.97 4.50 5.19 11.07 11.94 12/24/2016 14.08    154,115       2,500     161,354      2,500  7.93 9.59 45.43 54.78 231.51 206.61 4.69 6.04 10.26 12.18 12/25/2016      136,589       2,500     155,448      2,500  6.53 8.14 37.78 46.62 301.73 254.06 3.83 4.84 10.20 11.32 12/26/2016      138,271       2,500    137,192      2,500  7.42 7.52 42.85 43.48 274.96 266.36 4.36 4.64 10.81 11.24 12/27/2016      138,271       2,500    137,192      2,500  7.26 7.02 41.91 40.56 266.52 259.47 4.23 4.23 10.25 10.04 12/28/2016      138,271       2,500    137,192      2,500  6.45 6.19 37.24 35.79 260.61 272.62 3.93 3.78 9.38 9.32 12/29/2016      138,271       2,500    137,192      2,500  7.00 7.43 40.44 42.96 279.85 274.78 4.43 4.54 11.13 11.25 12/30/2016      138,271       2,500    137,192      2,500  7.42 6.84 42.86 39.54 277.00 238.49 4.61 4.10 11.50 9.15 12/31/2016      139,954       2,500     118,936      2,500  6.95 6.73 40.11 39.34 254.21 251.10 4.47 4.26 10.45 9.88 1/1/2017      150,993       2,500    150,000      2,500  7.13 6.94 40.90 39.84 265.36 254.71 4.59 4.26 11.10 9.98 1/2/2017      150,993       2,500    150,000      2,500  3.29 6.21 18.89 35.65 293.00 281.32 4.97 4.27 12.94 10.78 1/3/2017      150,993       2,500    150,000      2,500  6.92 6.52 39.69 37.43 282.00 281.39 4.26 4.10 10.77 10.34 1/4/2017      150,993       2,500    150,000      2,500  7.58 7.62 43.47 43.77 260.01 269.05 4.73 4.81 11.27 11.74 192  Mill Calculated Ratios - Plant 2 Date Work Index SAG 1     F80   microns  SAG 1     T80   microns  SAG 2     F80   microns  SAG 2     T80   microns  SAG 1      kW-h/t SAG 2     kW-h/t SAG 1   Wio SAG 2  Wio BM 1    P80  microns BM 2    P80  microns BM  1     kW-h/t BM  2     kW-h/t BM 1 Wio BM 2 Wio 1/5/2017 12.87    150,993       2,500    150,000      2,500  6.72 7.87 38.57 45.21 253.83 221.77 4.90 5.22 11.47 11.07 1/6/2017      150,993       2,500    150,000      2,500  7.53 7.15 43.20 41.03 249.06 256.83 4.77 4.45 11.01 10.50 1/7/2017 13.80    150,993       2,500    150,000      2,500  7.34 7.09 42.13 40.73 253.80 263.53 4.46 4.26 10.43 10.24 1/8/2017      150,993       2,500    150,000      2,500  7.33 8.05 42.04 46.22 229.72 247.33 6.43 5.94 13.98 13.63 1/9/2017 12.74    150,993       2,500    150,000      2,500  7.25 6.83 41.63 39.24 230.13 247.38 4.60 4.28 10.02 9.82 1/10/2017      150,993       2,500    150,000      2,500  7.46 6.94 42.79 39.85 230.86 238.48 4.63 4.43 10.10 9.90 1/11/2017 12.83    150,993       2,500    150,000      2,500  7.77 7.23 44.60 41.52 255.33 243.09 4.78 4.46 11.24 10.11 1/12/2017      150,993       2,500    150,000      2,500  7.11 6.85 40.79 39.32 259.57 245.46 4.31 4.33 10.24 9.88 1/13/2017 14.07    150,993       2,500    150,000      2,500  7.15 7.55 41.03 43.35 257.04 232.98 4.38 4.95 10.34 10.87 1/14/2017      150,993       2,500    150,000      2,500  7.87 8.04 45.13 46.18 230.51 213.58 4.76 5.02 10.38 10.36 1/15/2017      150,993       2,500    150,000      2,500  7.48 7.71 42.91 44.25 237.36 226.43 4.90 4.89 10.91 10.52 1/16/2017      162,032       2,500     195,592      2,500  6.96 6.92 39.73 39.02 256.28 241.36 4.34 4.51 10.23 10.18 1/17/2017      167,761       2,500     125,194      2,500  8.19 7.40 46.66 43.11 237.81 230.90 5.10 4.85 11.38 10.58 1/18/2017      138,478       2,500     194,652      2,500  8.03 10.71 46.36 60.42 196.98 192.41 5.19 7.01 10.12 13.46 1/19/2017      133,195       2,500     177,924      2,500  6.52 8.07 37.76 45.76 236.93 221.06 3.99 5.23 8.86 11.07 1/20/2017      148,466       2,500     177,360      2,500  6.67 8.07 38.32 45.79 263.55 215.78 3.95 5.13 9.49 10.68 193  Mill Calculated Ratios - Plant 2 Date Work Index SAG 1     F80   microns  SAG 1     T80   microns  SAG 2     F80   microns  SAG 2     T80   microns  SAG 1      kW-h/t SAG 2     kW-h/t SAG 1   Wio SAG 2  Wio BM 1    P80  microns BM 2    P80  microns BM  1     kW-h/t BM  2     kW-h/t BM 1 Wio BM 2 Wio 1/21/2017      152,946       2,500     141,817      2,500  6.95 7.66 39.83 44.19 277.87 235.48 4.19 4.95 10.48 10.95 1/22/2017      123,776       2,500     153,445      2,500  6.70 7.91 39.03 45.34 240.83 250.03 4.01 5.08 9.03 11.76 1/23/2017      120,634       2,500     161,722      2,500  6.95 7.17 40.61 40.92 261.46 233.66 4.24 4.71 10.14 10.36 1/24/2017      132,871       2,500     116,433      2,500  7.49 7.17 43.42 41.99 253.08 192.09 4.42 4.88 10.31 9.35 1/25/2017 12.84    141,747       2,500    119,668      2,500  7.05 6.92 40.64 40.45 262.97 249.75 4.05 4.35 9.72 10.04 1/26/2017      141,747       2,500    119,668      2,500  6.61 7.23 38.12 42.23 259.45 237.68 3.93 4.57 9.33 10.19 1/27/2017 13.05    141,747       2,500    119,668      2,500  6.91 8.46 39.85 49.47 262.74 235.78 3.94 5.24 9.44 11.62 1/28/2017      141,747       2,500    119,668      2,500  6.84 7.83 39.42 45.74 272.20 238.34 4.22 4.86 10.39 10.85 1/29/2017      141,747       2,500    119,668      2,500    7.12 0.00 41.62   233.02   4.32   9.49 1/30/2017      141,747       2,500    119,668      2,500  4.21 7.34 24.28 42.92   233.00 4.50 4.62   10.14 1/31/2017      141,747       2,500    119,668      2,500  7.76 7.24 44.76 42.29   233.00 4.52 4.60   10.11 2/1/2017      141,747       2,500    119,668      2,500  7.03 6.99 40.55 40.83   233.00 4.08 4.37   9.60 2/2/2017 12.08    141,747       2,500    119,668      2,500  7.49 7.80 43.18 45.58 271.10 261.53 4.43 4.88 10.89 11.66 2/3/2017      141,747       2,500    119,668      2,500  7.28 7.21 41.97 42.15 255.75 226.00 5.02 5.15 11.79 11.08 2/4/2017   141747      2,500    119,668      2,500    3.68 0.00 21.52   233.00   2.87   6.30 2/5/2017   141747      2,500    119,668      2,500    7.72 0.00 45.10   233.00   4.69   10.31 2/6/2017   141747      2,500    119,668      2,500    7.05 0.00 41.23   233.00   4.77   10.48 194  Mill Calculated Ratios - Plant 2 Date Work Index SAG 1     F80   microns  SAG 1     T80   microns  SAG 2     F80   microns  SAG 2     T80   microns  SAG 1      kW-h/t SAG 2     kW-h/t SAG 1   Wio SAG 2  Wio BM 1    P80  microns BM 2    P80  microns BM  1     kW-h/t BM  2     kW-h/t BM 1 Wio BM 2 Wio 2/7/2017      150,622       2,500     122,904      2,500  7.73 6.88 44.37 40.14 256.00 233.00 4.27 4.32 10.05 9.49 2/8/2017      161,529       2,500     159,254      2,500  7.32 8.31 41.79 47.52 256.00 233.00 4.71 5.01 11.09 11.02 2/9/2017      185,198       2,500     191,851      2,500  7.89 8.82 44.66 49.79 256.00 233.00 5.16 5.38 12.15 11.83 2/10/2017      164,989       2,500    181,016      2,500  6.63 7.79 37.80 44.15 275.41 239.46 4.22 4.63 10.49 10.39 2/11/2017      164,989       2,500    181,016      2,500  7.04 7.32 40.14 41.47 249.63 266.19 5.35 4.36 12.36 10.56 2/12/2017      164,989       2,500    181,016      2,500  7.37 7.18 42.01 40.71 297.06 240.82 4.25 4.10 11.17 9.23 2/13/2017      164,989       2,500    181,016      2,500  7.27 7.87 41.45 44.56 256.00 233.00 5.72 4.47 13.46 9.81 2/14/2017 14.31    164,989       2,500    181,016      2,500  7.57 7.66 43.16 43.42 282.02 228.94 4.53 4.32 11.45 9.37 2/15/2017      164,989       2,500    181,016      2,500  7.02 7.89 40.02 44.72 270.08 223.41 4.08 4.68 9.99 9.98 2/16/2017 12.62    164,989       2,500    181,016      2,500  6.59 7.89 37.60 44.73 270.23 226.15 3.97 4.51 9.73 9.69 2/17/2017      164,989       2,500    181,016      2,500  7.01 7.55 39.98 42.77 263.34 245.43 4.46 4.49 10.72 10.25 2/18/2017 11.94    164,989       2,500    181,016      2,500  6.91 7.52 39.38 42.60 266.47 259.69 4.11 4.29 9.95 10.20 2/19/2017      164,989       2,500    181,016      2,500  7.04 7.41 40.15 41.96 259.71 237.32 4.21 4.18 10.02 9.31 2/20/2017 13.97    164,989       2,500    181,016      2,500  7.69 9.35 43.86 52.99 241.66 226.55 4.64 5.55 10.47 11.94 2/21/2017      164,989       2,500    181,016      2,500  7.04 8.19 40.14 46.38 274.15 244.64 5.13 4.90 12.71 11.16 2/22/2017 11.45    164,989       2,500    181,016      2,500  6.95 7.40 39.61 41.93 261.18 243.03 4.30 4.45 10.26 10.09 195  Mill Calculated Ratios - Plant 2 Date Work Index SAG 1     F80   microns  SAG 1     T80   microns  SAG 2     F80   microns  SAG 2     T80   microns  SAG 1      kW-h/t SAG 2     kW-h/t SAG 1   Wio SAG 2  Wio BM 1    P80  microns BM 2    P80  microns BM  1     kW-h/t BM  2     kW-h/t BM 1 Wio BM 2 Wio 2/23/2017      164,989       2,500    181,016      2,500  6.29 7.06 35.85 39.99 299.36 269.94 3.93 4.17 10.40 10.21 2/24/2017      144,780       2,500     170,180      2,500  6.23 7.65 35.88 43.53 258.84 229.92 3.92 4.56 9.29 9.92 2/25/2017      124,866       2,500     131,419      2,500  6.22 6.98 36.21 40.46 286.05 260.11 3.99 4.11 10.20 9.78 2/26/2017      150,415       2,500     141,792      2,500  6.56 7.12 37.68 41.05 282.73 254.15 4.20 4.20 10.63 9.83 2/27/2017      136,456       2,500     146,639      2,500  6.41 7.24 37.06 41.63 294.52 240.58 4.05 4.27 10.57 9.59 2/28/2017      133,120       2,500     119,820      2,500  6.53 7.17 37.86 41.88 289.61 260.87 4.16 4.32 10.74 10.30 3/1/2017      154,641       2,500     165,961      2,500  8.28 9.09 47.45 51.80 256.96 235.51 5.15 6.16 12.16 13.64 3/2/2017      158,242       2,500     189,160      2,500  10.60 11.38 60.63 64.27 213.79 168.07 6.61 6.56 13.65 11.47 3/3/2017      174,498       2,500     165,556      2,500  9.04 10.24 51.37 58.35 200.33 172.28 5.08 5.73 10.02 10.21 3/4/2017      156,071       2,500     178,469      2,500  6.93 8.69 39.67 49.30 231.79 206.96 4.27 5.35 9.34 10.81 3/5/2017      142,813       2,500     146,931      2,500  6.22 7.04 35.84 40.47 292.62 272.98 3.99 4.35 10.37 10.72 3/6/2017 13.72    131,123       2,500    150,188      2,500  6.33 7.36 36.71 42.24 281.13 252.59 3.74 4.51 9.43 10.51 3/7/2017      131,123       2,500    150,188      2,500  6.50 6.82 37.73 39.17 298.18 260.08 3.72 4.32 9.83 10.28 3/8/2017 12.62    131,123       2,500    150,188      2,500  6.36 7.25 36.87 41.61 264.86 223.68 3.90 4.24 9.40 9.05 3/9/2017      131,123       2,500    150,188      2,500  6.26 7.24 36.30 41.58 298.47 234.39 3.58 4.58 9.44 10.11 3/10/2017 11.98    131,123       2,500    150,188      2,500  6.29 7.36 36.47 42.27 275.76 253.34 3.59 5.19 8.93 12.11 196  Mill Calculated Ratios - Plant 2 Date Work Index SAG 1     F80   microns  SAG 1     T80   microns  SAG 2     F80   microns  SAG 2     T80   microns  SAG 1      kW-h/t SAG 2     kW-h/t SAG 1   Wio SAG 2  Wio BM 1    P80  microns BM 2    P80  microns BM  1     kW-h/t BM  2     kW-h/t BM 1 Wio BM 2 Wio 3/11/2017      131,123       2,500    150,188      2,500  6.43 7.04 37.28 40.43 293.60 245.58 3.67 4.27 9.56 9.75 3/12/2017 12.60    131,123       2,500    150,188      2,500  6.52 7.69 37.85 44.16 283.43 267.28 3.91 4.65 9.93 11.29 3/13/2017      131,123       2,500    150,188      2,500  7.43 11.09 43.13 63.69 254.13 197.06 4.49 7.20 10.51 14.06 3/14/2017 13.21    131,123       2,500    150,188      2,500  6.63 8.82 38.49 50.64 318.59 236.82 4.07 5.54 11.30 12.31 3/15/2017      131,123       2,500    150,188      2,500  6.38 6.97 37.00 40.00 287.79 271.59 4.22 4.50 10.84 11.05 3/16/2017      131,123       2,500    150,188      2,500  6.50 9.09 37.71 52.18 288.00   3.99 5.65 10.26   3/17/2017      119,432       2,500     153,445      2,500  6.20 7.74 36.25 44.39 318.56 260.48 3.88 4.64 10.76 11.06 3/18/2017      119,534       2,500     151,155      2,500  6.21 7.04 36.28 40.40 338.28 304.93 3.53 4.11 10.28 11.03 3/19/2017      137,764       2,500     140,371      2,500  6.32 6.58 36.52 37.96 305.51 313.40 3.70 3.91 9.93 10.72 3/20/2017      112,712       2,500     165,835      2,500  6.66 7.18 39.10 40.91 278.10 281.95 3.82 4.21 9.57 10.65 3/21/2017      145,352       2,500     167,708      2,500  13.78 19.95 79.29 113.65 280.11 249.04 8.07 11.75 20.31 27.10 3/22/2017      124,205       2,500     148,732      2,500  6.35 13.62 36.97 78.25 282.50 232.15 3.63 7.88 9.18 17.28 3/23/2017      113,512       2,500     133,257      2,500  6.23 12.90 36.56 74.75 282.80 263.51 3.59 7.78 9.09 18.69 3/24/2017      130,525       2,500     121,292      2,500  12.41 12.86 72.03 75.06 271.68 268.03 7.07 7.71 17.38 18.76 3/25/2017      127,275       2,500     137,606      2,500  12.66 13.28 73.62 76.75 282.17 308.80 7.12 7.60 18.01 20.59 3/26/2017 12.61    154,165       2,500     153,869      2,500  12.05 12.99 69.05 74.43 309.99 266.58 6.84 7.98 18.58 19.35 197  Mill Calculated Ratios - Plant 2 Date Work Index SAG 1     F80   microns  SAG 1     T80   microns  SAG 2     F80   microns  SAG 2     T80   microns  SAG 1      kW-h/t SAG 2     kW-h/t SAG 1   Wio SAG 2  Wio BM 1    P80  microns BM 2    P80  microns BM  1     kW-h/t BM  2     kW-h/t BM 1 Wio BM 2 Wio 3/27/2017      153,162       2,500     162,052      2,500  11.94 71.86 68.46 410.26 226.59 279.74 6.65   14.33 0.00 3/28/2017 12.37    149,567       2,500     144,218      2,500  13.06 13.75 74.97 79.20 288.28 285.60 7.26 7.53 18.66 19.22 3/29/2017      150,916       2,500     150,741      2,500  12.30 12.50 70.59 71.71 300.05 290.65 7.16 7.19 18.97 18.60 3/30/2017 11.90    153,627       2,500     181,484      2,500  13.88 15.60 79.56 88.36 279.50 213.84 7.61 8.49 19.12 17.55 3/31/2017      146,862       2,500     149,661      2,500  14.82 13.38 85.21 76.86 265.91 207.42 8.26 7.76 19.99 15.71 4/1/2017 13.29    138,714       2,500     157,480      2,500  7.00 7.71 40.45 44.08 258.48 218.25 4.45 7.57 10.55 15.87 4/2/2017      148,468       2,500     160,833      2,500  7.08 8.21 40.65 46.88 330.34 223.02 4.03 4.78 11.51 10.18 4/3/2017      148,131       2,500     152,799      2,500  7.60   43.69 0.00 234.89   4.78   10.56   4/4/2017      149,860       2,500        2,500  6.67   38.30   257.67   4.33 0.00 10.23   4/5/2017      153,175       2,500        2,500  7.50 3.69 43.00   241.00   4.39 7.03 9.88   4/6/2017      142,523       2,500     180,923      2,500  7.06 8.72 40.66 49.44 305.99 216.57 3.96 5.23 10.65 10.90 4/7/2017      143,997       2,500     165,211      2,500  7.35 7.22 42.35 41.17 258.77 242.89 4.09 4.28 9.71 9.70 4/8/2017      134,770       2,500     164,823      2,500  7.21 6.87 41.73 39.15 278.05 260.84 4.07 4.07 10.19 9.70 4/9/2017      170,752       2,500     194,682      2,500  7.44 7.84 42.33 44.19 259.49 293.91 4.13 4.64 9.81 12.10 4/10/2017      146,450       2,500     189,759      2,500  6.77 7.26 38.95 41.01 285.04 310.61 3.82 4.47 9.73 12.16 4/11/2017      186,263       2,500     206,808      2,500  7.69 7.28 43.46 40.88 300.21 286.75 4.25 4.42 11.26 11.32 198  Mill Calculated Ratios - Plant 2 Date Work Index SAG 1     F80   microns  SAG 1     T80   microns  SAG 2     F80   microns  SAG 2     T80   microns  SAG 1      kW-h/t SAG 2     kW-h/t SAG 1   Wio SAG 2  Wio BM 1    P80  microns BM 2    P80  microns BM  1     kW-h/t BM  2     kW-h/t BM 1 Wio BM 2 Wio 4/12/2017      143,327       2,500     168,735      2,500  7.11 6.90 40.93 39.26 277.79 272.43 3.81 4.08 9.52 10.05 4/13/2017      156,361       2,500     157,307      2,500  7.17 6.66 41.06 38.12 270.86 269.69 4.05 3.88 9.93 9.49 4/14/2017      137,949       2,500     143,735      2,500  6.85 6.51 39.55 37.51 305.92 292.86 4.49 3.88 12.08 10.10 4/15/2017 12.51    172,870       2,500     143,466      2,500  7.20 6.70 40.92 38.59 287.13 283.61 4.05 3.91 10.37 9.92 4/16/2017      143,421       2,500     141,157      2,500  6.64 6.30 38.25 36.32 326.16 317.58 3.79 3.89 10.72 10.77 4/17/2017 12.99    150,470       2,500     158,782      2,500  6.56 6.59 37.67 37.70 299.39 295.28 3.82 4.04 10.10 10.57 4/18/2017      145,102       2,500     135,125      2,500  6.79 5.94 39.08 34.39 300.96 309.00 4.03 3.77 10.70 10.23 4/19/2017 13.14    136,343       2,500     184,855      2,500  6.55 7.41 37.87 41.95 298.06 267.93 3.83 4.50 10.10 10.95 4/20/2017      143,752       2,500     157,018      2,500  6.37 7.12 36.66 40.74 307.24 256.42 3.71 4.28 10.03 10.09 4/21/2017 13.20    131,251       2,500     155,588      2,500  6.45 6.96 37.44 39.83 332.52 303.12 3.68 4.24 10.56 11.33 4/22/2017      152,098       2,500     164,939      2,500  6.79 7.82 38.96 44.58 326.19 274.02 3.87 4.71 10.93 11.65 4/23/2017 12.52    135,471       2,500     134,574      2,500  5.92 6.01 34.26 34.81 331.55 323.79 4.03 4.00 11.53 11.23 4/24/2017      132,507       2,500     137,917      2,500  6.02 6.23 34.88 36.00 316.09 233.93 3.94 4.12 10.87 9.07 4/25/2017      126,918       2,500     132,425      2,500  5.84 6.35 33.97 36.81 292.63 299.86 3.92 4.28 10.19 11.35 4/26/2017      142,231       2,500     139,434      2,500  6.34 6.34 36.52 36.61 274.08 273.16 4.14 4.21 10.25 10.38 4/27/2017      143,535       2,500     148,794      2,500  6.50 6.72 37.46 38.59 273.27 294.98 4.19 4.36 10.34 11.42 199  Mill Calculated Ratios - Plant 2 Date Work Index SAG 1     F80   microns  SAG 1     T80   microns  SAG 2     F80   microns  SAG 2     T80   microns  SAG 1      kW-h/t SAG 2     kW-h/t SAG 1   Wio SAG 2  Wio BM 1    P80  microns BM 2    P80  microns BM  1     kW-h/t BM  2     kW-h/t BM 1 Wio BM 2 Wio 4/28/2017      151,027       2,500     169,494      2,500  6.82 7.37 39.14 41.96 282.63 267.50 4.36 4.77 11.05 11.60 4/29/2017      123,370       2,500     140,138      2,500  6.50 6.65 37.90 38.38 285.57 265.00 4.20 4.42 10.72 10.68 4/30/2017      140,542       2,500     111,875      2,500  6.15 5.63 35.49 33.10 301.10 253.59 4.05 4.04 10.77 9.43 5/1/2017      134,259       2,500     131,528      2,500  6.53 5.97 37.79 34.62 276.06 270.55 4.31 4.31 10.72 10.55 5/2/2017      122,338       2,500     131,694      2,500  6.72 6.26 39.18 36.31 276.02 270.53 4.39 4.45 10.93 10.90 5/3/2017      150,816       2,500     145,085      2,500  7.37 6.67 42.28 38.36     4.96 4.61     5/4/2017          2,500    152,042      2,500    7.35   42.15   156.63   4.95   8.26 5/5/2017 15.06        2,500    164,102      2,500    8.12   46.31   220.09   5.33   11.24 5/6/2017      294,386       2,500     158,999      2,500  6.35 7.96 34.99 45.51   220.30 9.44 5.19   10.96 5/7/2017 14.96    205,743       2,500     176,162      2,500  10.33 8.21 58.06 46.58 210.53 208.96 6.99 5.33 14.28 10.85 5/8/2017      211,465       2,500     190,911      2,500  8.90 8.75 49.94 49.41 229.43 190.44 6.06 5.88 13.18 11.20 5/9/2017      161,611       2,500     172,873      2,500  6.72 7.49 38.38 42.54 297.22 258.12 4.44 4.86 11.68 11.52 5/10/2017      140,821       2,500     135,602      2,500  6.66 6.33 38.39 36.65 319.50 275.26 4.29 4.24 11.93 10.53 5/11/2017      129,288       2,500     128,291      2,500  6.54 6.35 37.98 36.88 289.41 254.07 4.20 4.53 10.82 10.59 5/12/2017      131,843       2,500     131,170      2,500  6.52 5.92 37.78 34.36 313.88 305.43 4.31 4.17 11.83 11.20 5/13/2017      132,977       2,500     159,914      2,500  6.71 6.85 38.86 39.16 293.04 262.01 4.29 5.26 11.16 12.58 200  Mill Calculated Ratios - Plant 2 Date Work Index SAG 1     F80   microns  SAG 1     T80   microns  SAG 2     F80   microns  SAG 2     T80   microns  SAG 1      kW-h/t SAG 2     kW-h/t SAG 1   Wio SAG 2  Wio BM 1    P80  microns BM 2    P80  microns BM  1     kW-h/t BM  2     kW-h/t BM 1 Wio BM 2 Wio 5/14/2017      148,388       2,500     158,532      2,500  7.42 7.07 42.65 40.45 266.04 248.86 4.90 4.76 11.87 10.97 5/15/2017      175,260       2,500     154,940      2,500  8.28 7.06 47.00 40.46 247.54 232.16 5.22 4.83 11.98 10.59 5/16/2017      142,988       2,500     152,856      2,500  7.54 6.97 43.45 39.96 273.42 245.27 4.74 4.68 11.71 10.66 5/17/2017      162,458       2,500     160,238      2,500  7.17 6.68 40.94 38.14 278.61 270.01 5.14 4.67 12.88 11.43 5/18/2017      140,845       2,500     137,624      2,500  6.99 6.11 40.33 35.29 309.36 309.75 4.49 4.33 12.17 11.75 5/19/2017      193,418       2,500     132,444      2,500  7.51 6.88 42.36 39.87 301.22 302.78 5.07 4.71 13.47 12.57 5/20/2017      147,935       2,500     122,682      2,500  3.80 5.62 21.83 32.78 336.61 208.78 12.88 4.02 37.32 8.17 5/21/2017      128,928       2,500     126,693      2,500  6.76 6.40 39.29 37.25 285.58 295.03 4.19 4.23 10.69 11.08 5/22/2017      157,505       2,500     138,065      2,500  6.75 6.04 38.60 34.91 262.29 324.05 4.39 3.99 10.52 11.23 5/23/2017      133,044       2,500     131,713      2,500  6.70 6.22 38.83 36.07 310.73 315.58 4.29 4.01 11.67 11.04 5/24/2017      158,611       2,500     169,485      2,500  6.87 7.54 39.27 42.92 310.30 283.60 3.91 5.41 10.64 13.73 5/25/2017      148,570       2,500     136,994      2,500  6.80 6.20 39.06 35.85 303.30 273.67 4.41 3.99 11.78 9.86 5/26/2017      149,975       2,500     130,263      2,500  6.72 5.82 38.56 33.77 308.24 273.25 4.40 3.92 11.92 9.67 5/27/2017      158,078       2,500     145,348      2,500  7.02 6.51 40.12 37.44 264.17 276.03 4.31 4.34 10.37 10.80 5/28/2017      142,852       2,500     135,496      2,500  6.68 6.39 38.49 36.98 291.36 275.74 4.09 5.28 10.60 13.12 5/29/2017      172,502       2,500     158,157      2,500  7.05 6.82 40.07 39.01 276.68 266.57 4.80 4.84 11.97 11.74 201  Mill Calculated Ratios - Plant 2 Date Work Index SAG 1     F80   microns  SAG 1     T80   microns  SAG 2     F80   microns  SAG 2     T80   microns  SAG 1      kW-h/t SAG 2     kW-h/t SAG 1   Wio SAG 2  Wio BM 1    P80  microns BM 2    P80  microns BM  1     kW-h/t BM  2     kW-h/t BM 1 Wio BM 2 Wio 5/30/2017      159,626       2,500     157,733      2,500  7.52 7.06 43.00 40.37 250.67 237.65 4.56 4.64 10.58 10.35 5/31/2017          2,500    138,272      2,500  4.17 6.12   35.34 280.41 198.36   4.12 0.00 8.08 6/1/2017      165,100       2,500     133,112      2,500  3.89 5.89 22.15 34.13 240.68 211.74 9.77 4.11 21.98 8.43 6/2/2017      128,062       2,500     118,811      2,500  6.40 6.08 37.21 35.56 315.41 293.73 4.01 4.15 11.04 10.83 6/3/2017      137,442       2,500     134,048      2,500  6.51 6.61 37.63 38.30 292.03 303.88 3.98 5.01 10.34 13.41 6/4/2017      157,480       2,500     165,100      2,500  7.09 7.09 40.58 40.43 288.02 237.00 4.38 4.93 11.25 10.97 6/5/2017      150,270       2,500     124,637      2,500  7.07 6.67 40.57 38.87 296.20 277.64 4.27 4.47 11.20 11.17 6/6/2017      136,036       2,500     150,667      2,500  6.60 6.40 38.17 36.76 370.38 299.14 3.96 4.35 12.39 11.51 6/7/2017      166,272       2,500     180,129      2,500  7.68 7.48 43.79 42.37 298.47 272.97 4.68 4.97 12.35 12.27 6/8/2017 13.25    162,582       2,500     167,188      2,500  7.06 9.31 40.32 53.04 302.72 206.71 4.36 6.24 11.62 12.60 6/9/2017      172,346       2,500     159,285      2,500  6.84 6.99 38.88 39.98 322.93 252.51 4.16 4.69 11.67 10.93 6/10/2017 13.43    160,046       2,500     132,370      2,500  6.65 6.69 37.99 38.78 328.44 281.34 3.96 4.53 11.27 11.44 6/11/2017      161,853       2,500     126,431      2,500  7.07 6.74 40.39 39.24 344.90 280.45 4.09 4.55 12.08 11.46 6/12/2017 13.83    133,744       2,500     167,755      2,500  6.87 7.43 39.78 42.29 348.86 290.51 3.93 5.04 11.73 13.03 6/13/2017      139,350       2,500     135,880      2,500  6.97 6.77 40.25 39.18 321.29 303.63 4.21 4.57 11.75 12.21 6/14/2017      136,136       2,500     142,818      2,500  6.57 6.74 38.03 38.86 311.36 274.70 3.85 4.55 10.49 11.28 202  Mill Calculated Ratios - Plant 2 Date Work Index SAG 1     F80   microns  SAG 1     T80   microns  SAG 2     F80   microns  SAG 2     T80   microns  SAG 1      kW-h/t SAG 2     kW-h/t SAG 1   Wio SAG 2  Wio BM 1    P80  microns BM 2    P80  microns BM  1     kW-h/t BM  2     kW-h/t BM 1 Wio BM 2 Wio 6/15/2017      139,816       2,500     149,838      2,500  6.72 6.77 38.79 38.85 312.63 270.52 4.19 4.51 11.46 11.05 6/16/2017      137,160       2,500     134,434      2,500  6.06 5.51 35.00 31.90 316.52 235.82 7.19 3.97 19.86 8.79 6/17/2017      140,597       2,500     146,264      2,500  6.45 6.29 37.22 36.16 306.19 310.81 3.93 4.49 10.58 12.24 6/18/2017      156,986       2,500     157,582      2,500  7.17 6.47 41.03 37.02 260.61 260.92 4.26 4.75 10.16 11.34 6/19/2017      187,242       2,500     142,559      2,500  7.76 6.44 43.85 37.10 266.00 279.24 4.63 4.41 11.20 11.06 6/20/2017      154,962       2,500     137,784      2,500  7.37 6.12 42.24 35.37 289.71 271.91 4.46 4.21 11.51 10.37 6/21/2017      153,556       2,500     165,679      2,500  6.64 7.30 38.07 41.61 287.76 281.91 4.33 4.88 11.11 12.35 6/22/2017      123,331       2,500     116,820      2,500  6.07 6.10 35.41 35.72 277.17 238.40 3.93 5.06 9.81 11.30 6/23/2017      137,949       2,500     130,653      2,500  6.63 5.90 38.32 34.22 310.23 307.04 4.24 4.19 11.52 11.32 6/24/2017 12.82    147,216       2,500     138,431      2,500  6.99 6.14 40.18 35.45 298.51 303.27 4.49 4.30 11.87 11.49 6/25/2017      180,519       2,500     144,533      2,500  7.76 6.38 43.96 36.75 271.97 298.18 4.94 4.41 12.16 11.63 6/26/2017 12.71    142,067       2,500     137,905      2,500  7.85 8.22 45.24 47.51 265.38 233.97 5.05 5.50 12.20 12.11 6/27/2017      145,676       2,500     130,081      2,500  7.29 6.17 41.94 35.80 298.40 280.93 4.70 4.24 12.40 10.70 6/28/2017 13.86    127,199       2,500     134,418      2,500  7.12 6.44 41.41 37.31 282.23 280.89 4.61 4.31 11.66 10.87 6/29/2017 13.12    133,855       2,500     130,261      2,500  7.34 6.46 42.52 37.49 283.08 295.85 4.63 4.22 11.74 11.06 6/30/2017      156,055       2,500     137,295      2,500  7.48 6.36 42.79 36.74 288.76 273.23 4.69 4.03 12.07 9.95 203  Mill Calculated Ratios - Plant 2 Date Work Index SAG 1     F80   microns  SAG 1     T80   microns  SAG 2     F80   microns  SAG 2     T80   microns  SAG 1      kW-h/t SAG 2     kW-h/t SAG 1   Wio SAG 2  Wio BM 1    P80  microns BM 2    P80  microns BM  1     kW-h/t BM  2     kW-h/t BM 1 Wio BM 2 Wio 7/1/2017 12.80    130,939       2,500     135,930      2,500  8.36 7.27 48.52 42.06 245.16 203.21 5.30 4.46 12.07 8.89 7/2/2017      169,418       2,500     148,048      2,500  7.92 5.86 45.07 33.65 249.45 249.84 12.49 3.61 28.84 8.35 7/3/2017 13.57    145,327       2,500     146,018      2,500  8.19 6.71 47.13 38.61 261.28 301.71 5.29 4.02 12.63 10.70 7/4/2017      145,034       2,500    165,831      2,500  7.47   42.98 0.00 231.74   4.94   10.80   7/5/2017 13.63    178,573       2,500     203,901      2,500  9.35 10.27 53.02 57.72 236.38 160.15 6.06 6.41 13.45 10.86 7/6/2017      164,613       2,500     185,644      2,500  7.25 8.23 41.33 46.53 288.81 216.65 4.77 5.22 12.29 10.89 7/7/2017 13.65    161,641       2,500     161,290      2,500  7.36 7.59 42.05 43.35 224.90 221.53 4.85 4.82 10.40 10.22 7/8/2017      165,582       2,500     139,363      2,500  6.73 6.81 38.37 39.34 286.96 248.15 4.43 4.28 11.35 9.85 7/9/2017 13.78    147,538       2,500     140,369      2,500  6.49 6.26 37.28 36.13 293.92 265.60 4.49 4.50 11.70 10.87 7/10/2017      147,955       2,500     155,194      2,500  7.06 8.08 40.59 46.26 278.24 217.68 4.66 5.20 11.66 10.88 7/11/2017 13.90    127,434       2,500     126,731      2,500  6.54 6.49 38.03 37.73 313.28 294.64 4.38 4.24 12.00 11.07 7/12/2017      133,452       2,500     133,685      2,500  6.67 6.43 38.65 37.22 324.93 300.44 4.41 4.20 12.43 11.15 7/13/2017 12.92    149,016       2,500     139,721      2,500  7.46 6.91 42.86 39.88 289.00 281.65 5.09 4.60 13.11 11.62 7/14/2017      144,137       2,500     138,065      2,500  8.01 7.92 46.15 45.76 272.67 251.46 5.59 5.06 13.77 11.75 7/15/2017 13.14    148,117       2,500     160,485      2,500  8.44 8.01 48.51 45.73 260.18 238.41 5.54 5.05 13.19 11.28 7/16/2017      136,812       2,500     146,306      2,500  7.19 6.75 41.58 38.81 302.12 289.01 4.99 4.61 13.29 11.87 204  Mill Calculated Ratios - Plant 2 Date Work Index SAG 1     F80   microns  SAG 1     T80   microns  SAG 2     F80   microns  SAG 2     T80   microns  SAG 1      kW-h/t SAG 2     kW-h/t SAG 1   Wio SAG 2  Wio BM 1    P80  microns BM 2    P80  microns BM  1     kW-h/t BM  2     kW-h/t BM 1 Wio BM 2 Wio 7/17/2017 13.05    158,947       2,500     134,732      2,500  8.19 8.43 46.85 48.78 272.84 283.02 5.28 5.45 13.02 13.82 7/18/2017      191,231       2,500     178,497      2,500  7.93 9.34 44.76 52.99 286.55 236.05 5.18 6.25 13.26 13.86 7/19/2017 12.78    154,838       2,500     156,449      2,500  7.86 7.22 45.00 41.30 259.67 237.93 5.15 4.72 12.24 10.52 7/20/2017      150,035       2,500     143,853      2,500  7.49 7.19 43.01 41.39 256.02 234.88 4.89 4.59 11.50 10.14 7/21/2017 12.36    161,382       2,500     118,858      2,500  6.91 6.95 39.47 40.65 267.32 255.32 4.58 4.40 11.13 10.33 7/22/2017      166,806       2,500     147,236      2,500  7.03 7.17 40.04 41.20 295.47 246.15 4.60 4.52 12.05 10.34 7/23/2017 14.45    155,886       2,500     118,780      2,500  6.91 7.30 39.53 42.67 301.95 253.52 4.52 4.54 12.05 10.61 7/24/2017      135,065       2,500     117,325      2,500  6.72 6.98 38.90 40.88 317.84 256.48 4.31 4.37 11.93 10.30 7/25/2017 13.92    149,990       2,500     143,233      2,500  7.07 6.43 40.58 37.03 291.31 259.78 4.59 3.96 11.89 9.43 7/26/2017      156,022       2,500     154,651      2,500  6.94 7.07 39.71 40.50 273.01 256.93 4.43 4.22 10.94 9.96 7/27/2017 13.87    158,433       2,500     152,464      2,500  7.52 7.42 42.97 42.56 299.30 241.39 4.78 4.48 12.65 10.10 7/28/2017      139,637       2,500     146,241      2,500  6.66 6.90 38.46 39.71 267.79 258.97 4.30 4.17 10.47 9.89 7/29/2017 13.64    158,496       2,500     146,876      2,500  7.28 6.59 41.62 37.89 273.83 286.11 4.71 4.06 11.65 10.37 7/30/2017      140,970       2,500     145,288      2,500  7.45 6.76 42.96 38.92 276.00 285.73 5.02 4.31 12.50 11.00 7/31/2017 12.67    155,004       2,500     133,985      2,500  7.32 6.71 41.95 38.83 288.62 291.23 4.79 4.23 12.32 10.97 8/1/2017 13.90    166,878       2,500     130,810      2,500  7.30 6.35 41.59 36.83 277.93 276.79 4.85 4.17 12.14 10.40 205  Mill Calculated Ratios - Plant 2 Date Work Index SAG 1     F80   microns  SAG 1     T80   microns  SAG 2     F80   microns  SAG 2     T80   microns  SAG 1      kW-h/t SAG 2     kW-h/t SAG 1   Wio SAG 2  Wio BM 1    P80  microns BM 2    P80  microns BM  1     kW-h/t BM  2     kW-h/t BM 1 Wio BM 2 Wio 8/2/2017      143,256       2,500     136,652      2,500  8.02 7.98 46.18 46.13 248.53 239.38 5.25 5.49 12.09 12.30 8/3/2017      141,478       2,500     151,003      2,500  6.66 6.85 38.42 39.31 260.34 213.25 4.32 4.48 10.29 9.24 8/4/2017 13.62    158,623       2,500     180,213      2,500  7.25 7.25 41.48 41.11 280.09 266.36 4.68 4.74 11.76 11.49 8/5/2017      152,400       2,500     155,575      2,500  8.07 7.42 46.27 42.51 271.45 279.12 5.19 4.78 12.76 12.00 8/6/2017 12.91    165,418       2,500     163,005      2,500  8.24 7.27 46.98 41.48 277.36 323.61 5.45 4.66 13.62 13.09 8/7/2017      174,308       2,500     192,945      2,500  9.00 8.75 51.15 49.39 222.97 235.23 5.94 5.61 12.65 12.41 8/8/2017 12.65    160,020       2,500     180,023      2,500  8.37 7.69 47.82 43.57 257.28 262.48 6.14 5.00 14.50 11.98 8/9/2017      133,795       2,500     120,015      2,500  7.97 6.98 46.16 40.81 278.03 297.91 5.17 4.54 12.92 11.97 8/10/2017 12.53    145,161       2,500     136,271      2,500  7.60 6.57 43.72 37.98 251.67 253.62 4.84 4.30 11.24 10.05 8/11/2017      139,573       2,500     146,368      2,500  8.13 7.20 46.90 41.41 230.23 310.29 5.57 4.71 12.13 12.82 8/12/2017 14.12    153,670       2,500     155,766      2,500  8.63 8.50 49.45 48.67 209.97 217.08 5.69 5.61 11.61 11.72 8/13/2017          2,500        2,500  0.00 2.24         0.33 4.75     8/14/2017 13.90               -       2,500     138,430      2,500  0.00 8.51   49.14   206.04 0.00 5.31   10.70 8/15/2017                 -       2,500     146,285      2,500  1.72 10.17   58.48   184.40 1.50 6.35   11.84 8/16/2017 13.28    132,842       2,500     132,461      2,500  7.86 7.10 45.52 41.14 222.86 244.94 5.19 4.55 11.05 10.35 8/17/2017      134,112       2,500     131,953      2,500  7.73 7.58 44.74 43.97 214.43 239.92 4.92 4.87 10.19 10.93 206  Mill Calculated Ratios - Plant 2 Date Work Index SAG 1     F80   microns  SAG 1     T80   microns  SAG 2     F80   microns  SAG 2     T80   microns  SAG 1      kW-h/t SAG 2     kW-h/t SAG 1   Wio SAG 2  Wio BM 1    P80  microns BM 2    P80  microns BM  1     kW-h/t BM  2     kW-h/t BM 1 Wio BM 2 Wio 8/18/2017 13.29    137,414       2,500     140,462      2,500  7.04 7.86 40.67 45.37 237.41 229.85 4.34 5.02 9.66 10.93 8/19/2017      142,367       2,500     158,750      2,500  7.01 8.39 40.38 47.99 239.98 225.80 4.27 5.31 9.60 11.41 8/20/2017      135,382       2,500     160,881      2,500  5.98 6.78 34.58 38.73 289.58 257.58 3.79 4.25 9.78 10.06 8/21/2017      142,621       2,500     142,113      2,500  6.02 6.66 34.70 38.37 298.63 260.33 3.78 3.94 9.98 9.39 8/22/2017 13.13    128,016       2,500     158,369      2,500  6.12 7.43 35.56 42.51 294.98 258.75 3.76 4.34 9.83 10.30 8/23/2017      136,144       2,500     155,464      2,500  5.96 6.56 34.45 37.54 303.83 259.21 3.87 4.00 10.36 9.50 8/24/2017 13.56    159,258       2,500     150,914      2,500  6.21 7.42 35.52 42.57 259.54 268.43 3.73 4.41 8.87 10.75 8/25/2017      144,603       2,500     138,532      2,500  6.78 7.13 39.06 41.18 273.52 263.92 3.90 4.19 9.63 10.09 8/26/2017 12.65    114,808       2,500       92,710      2,500  6.33 6.21 37.13 37.12 297.70 298.57 3.68 3.77 9.70 9.96 8/27/2017      110,490       2,500       98,626      2,500  6.90 7.03 40.63 41.82 284.06 258.96 4.06 4.18 10.33 9.92 8/28/2017 14.03    114,143       2,500       86,644      2,500  6.35 6.90 37.28 41.57 314.62 303.61 3.91 4.27 10.75 11.42 8/29/2017      127,727       2,500     133,496      2,500  6.08 6.52 35.35 37.78 300.70 268.83 4.10 4.40 10.89 10.73 8/30/2017 12.43    120,331       2,500     131,432      2,500  6.16 6.59 36.01 38.21 327.48 283.82 3.92 4.21 11.12 10.70 8/31/2017      132,203       2,500     143,359      2,500  6.67 7.53 38.65 43.38 323.44 309.86 4.08 4.61 11.47 12.53 9/1/2017 13.22    138,499       2,500     141,484      2,500  7.34 8.28 42.39 47.72 263.98 238.97 4.50 5.03 10.83 11.27 9/2/2017      142,621       2,500     148,844      2,500  7.14 8.87 41.17 50.95 279.53 255.69 4.29 5.41 10.77 12.71 207  Mill Calculated Ratios - Plant 2 Date Work Index SAG 1     F80   microns  SAG 1     T80   microns  SAG 2     F80   microns  SAG 2     T80   microns  SAG 1      kW-h/t SAG 2     kW-h/t SAG 1   Wio SAG 2  Wio BM 1    P80  microns BM 2    P80  microns BM  1     kW-h/t BM  2     kW-h/t BM 1 Wio BM 2 Wio 9/3/2017 12.54    133,189       2,500     142,959      2,500  7.33 8.25 42.46 47.54 283.34 252.39 4.40 5.01 11.16 11.67 9/4/2017      132,901       2,500     126,842      2,500  7.81 8.33 45.25 48.48 262.09 236.04 4.81 5.08 11.51 11.27 9/5/2017      129,885       2,500     127,692      2,500  6.51 7.05 37.82 40.96 282.63 243.52 4.03 4.32 10.21 9.81 9/6/2017      129,227       2,500     133,732      2,500  6.89 7.24 40.02 41.93 268.15 255.08 4.44 4.56 10.82 10.69 9/7/2017      132,098       2,500     133,367      2,500  6.48 7.36 37.54 42.63 278.41 241.82 4.03 4.61 10.09 10.41 9/8/2017      125,451       2,500       91,436      2,500  6.32 6.86 36.77 41.11 267.83 263.93 4.04 4.32 9.84 10.41 9/9/2017      156,356       2,500     143,115      2,500  6.46 7.14 36.96 41.16 278.08 254.27 4.13 4.42 10.34 10.36 9/10/2017      157,351       2,500     120,001      2,500  6.76 8.42 38.69 49.22     4.28 5.12     9/11/2017 12.86    141,289       2,500     113,084      2,500  6.46 7.42 37.24 43.60     4.15 4.57     9/12/2017      134,620       2,500     143,002      2,500  6.31 6.94 36.53 39.96 303.11 292.97 4.13 4.36 11.02 11.35 9/13/2017 13.52    137,795       2,500     146,812      2,500  6.57 7.31 37.95 42.02 279.39 267.61 4.12 5.22 10.35 12.69 9/14/2017      131,086       2,500     146,048      2,500  6.20 7.39 35.98 42.53     4.19 6.10     9/15/2017 13.70    160,401       2,500     160,323      2,500  7.11 7.37 40.61 42.09 268.61 267.96 4.52 4.66 11.01 11.33 9/16/2017      144,740       2,500     149,382      2,500  8.86 10.70 50.99 61.46 235.79 211.05 5.59 6.63 12.38 13.58 9/17/2017 12.35    139,080       2,500     150,848      2,500  7.00 9.04 40.43 51.90 282.58 268.46 4.35 5.55 11.01 13.52 9/18/2017      133,473       2,500     147,853      2,500  6.84 7.53 39.64 43.28 307.59 252.66 4.15 5.19 11.22 12.09 208  Mill Calculated Ratios - Plant 2 Date Work Index SAG 1     F80   microns  SAG 1     T80   microns  SAG 2     F80   microns  SAG 2     T80   microns  SAG 1      kW-h/t SAG 2     kW-h/t SAG 1   Wio SAG 2  Wio BM 1    P80  microns BM 2    P80  microns BM  1     kW-h/t BM  2     kW-h/t BM 1 Wio BM 2 Wio 9/19/2017 12.25    134,121       2,500     138,426      2,500  6.87 7.12 39.78 41.11 308.98 265.43 4.07 4.70 11.05 11.37 9/20/2017      131,481       2,500     144,615      2,500  6.88 7.74 39.92 44.55 311.48 301.30 4.09 4.80 11.16 12.75 9/21/2017      133,906       2,500     149,737      2,500  6.68 8.89 38.71 51.07     4.01 5.60     9/22/2017      148,464       2,500     126,814      2,500  6.68 7.34 38.38 42.70 286.57 228.54 4.07 5.18 10.41 11.23 9/23/2017      134,118       2,500     122,489      2,500  6.48 7.79 37.53 45.47 272.97 208.42 3.99 5.45 9.84 11.07 9/24/2017      136,501       2,500     141,079      2,500  6.51 7.53 37.64 43.42 283.39 215.71 3.98 4.98 10.09 10.36 9/25/2017      144,951       2,500     173,159      2,500  6.61 7.41 38.05 42.11 311.51 242.04 4.02 5.55 10.96 12.54 9/26/2017      117,339       2,500     121,604      2,500  6.34 7.50 37.12 43.79 300.80 211.36 3.90 5.52 10.37 11.31 9/27/2017      136,099       2,500     126,752      2,500  6.53 7.18 37.78 41.78 261.87 234.29 4.02 4.93 9.63 10.88 9/28/2017      146,486       2,500     110,162      2,500  6.32 9.24 36.37 54.41 344.18 240.55 3.91 6.30 11.53 14.17 9/29/2017      130,035       2,500     153,936      2,500  7.02 5.51 40.73 31.60 297.00 228.50 4.39 5.03 11.55 10.90 9/30/2017      138,734       2,500     110,976      2,500  6.38 7.61 36.82 44.79     4.06 5.02     10/1/2017 14.10    110,577       2,500     112,157      2,500  7.95 9.61 46.78 56.51     4.90 5.82     10/2/2017      138,049       2,500        2,500  9.31   53.79   171.70   5.88   10.44   10/3/2017 12.68    146,879       2,500        2,500  14.89   85.60   186.87   9.17   17.24   10/4/2017          2,500        2,500  8.02       200.66   5.38   10.64   209  Mill Calculated Ratios - Plant 2 Date Work Index SAG 1     F80   microns  SAG 1     T80   microns  SAG 2     F80   microns  SAG 2     T80   microns  SAG 1      kW-h/t SAG 2     kW-h/t SAG 1   Wio SAG 2  Wio BM 1    P80  microns BM 2    P80  microns BM  1     kW-h/t BM  2     kW-h/t BM 1 Wio BM 2 Wio 10/5/2017      146,298       2,500        2,500  4.56   26.25   202.54   2.94 0.00 5.85   10/6/2017      133,415       2,500     148,385      2,500  6.27   36.34 0.00 277.44 211.53 3.98 0.80 9.94 1.64 10/7/2017      132,511       2,500     128,765      2,500  6.27 6.68 36.31 38.82 291.41 282.54 4.08 4.34 10.58 11.00 10/8/2017      125,115       2,500     131,532      2,500  5.98 6.21 34.80 36.00 318.21 283.31 4.03 4.24 11.17 10.75 10/9/2017      131,309       2,500     130,690      2,500  6.58 6.73 38.16 39.06 281.97 268.28 4.10 4.47 10.37 10.88 10/10/2017      129,223       2,500     130,722      2,500  5.91 6.90 34.30 40.02 281.90 281.78 3.87 4.35 9.79 10.99 10/11/2017      128,784       2,500     128,954      2,500  6.23 6.20 36.17 36.02 297.98 306.80 3.92 3.99 10.33 10.76 10/12/2017      144,543       2,500       97,129      2,500  6.27 6.87 36.09 40.93     3.97 4.51     10/13/2017      126,105       2,500       82,917      2,500  6.40 5.77 37.22 34.89     4.14 4.15     10/14/2017      112,080       2,500       97,421      2,500  6.84 6.78 40.21 40.36     4.46 4.46     10/15/2017         90,002       2,500     112,853      2,500  6.83 8.84 40.99 51.92 270.80 207.85 4.40 5.57 10.78 11.29 10/16/2017         97,759       2,500     111,195      2,500  6.72 7.81 39.98 45.93     4.19 5.05     10/17/2017      105,218       2,500       93,206      2,500  6.60 7.13 39.03 42.60 316.91 245.57 3.98 4.65 11.00 10.62 10/18/2017         93,544       2,500       72,731      2,500  6.79 6.87 40.56 42.15     4.03 4.53     10/19/2017         81,431       2,500     101,753      2,500  6.53 6.87 39.60 40.73 315.37 257.82 3.89 4.54 10.72 10.73 10/20/2017         82,198       2,500       99,000      2,500  10.55 6.28 63.92 37.31 281.06 304.02 6.24 4.19 15.75 11.20 210  Mill Calculated Ratios - Plant 2 Date Work Index SAG 1     F80   microns  SAG 1     T80   microns  SAG 2     F80   microns  SAG 2     T80   microns  SAG 1      kW-h/t SAG 2     kW-h/t SAG 1   Wio SAG 2  Wio BM 1    P80  microns BM 2    P80  microns BM  1     kW-h/t BM  2     kW-h/t BM 1 Wio BM 2 Wio 10/21/2017         78,298       2,500     112,558      2,500  4.68 7.13 28.52 41.88 261.81 242.79 3.01 4.74 7.20 10.72 10/22/2017         70,298       2,500     119,508      2,500  7.34 9.17 45.26 53.58 273.45 216.61 4.41 5.86 10.89 12.21 10/23/2017         74,201       2,500     105,376      2,500  7.03 8.29 43.06 48.99 261.36 221.88 4.18 5.23 10.00 11.10 10/24/2017         91,332       2,500     125,581      2,500  7.26 8.68 43.50 50.50 256.78 224.78 4.35 5.41 10.25 11.58 10/25/2017         85,058       2,500     106,756      2,500  5.65 6.24 34.13 36.86 329.15 282.01 3.56 4.27 10.14 10.81 10/26/2017         91,840       2,500       85,252      2,500  7.02 7.04 42.06 42.47     4.34 4.68     10/27/2017      107,455       2,500       98,337      2,500  6.41 6.40 37.80 38.05     4.13 4.39     10/28/2017      132,196       2,500     126,486      2,500  6.04 6.10 35.01 35.49 309.09 261.62 3.95 4.30 10.72 10.27 10/29/2017      130,125       2,500     108,209      2,500  6.65 6.22 38.59 36.66     4.20 4.30     10/30/2017      130,078       2,500     115,105      2,500  6.71 6.19 38.98 36.30     4.31 4.39     10/31/2017      133,683       2,500     123,675      2,500  5.75 6.25 33.32 36.46 328.99 281.52 3.93 4.38 11.18 11.05 11/1/2017      118,189       2,500     113,180      2,500  6.74 7.44 39.42 43.68 277.31 211.10 4.21 5.07 10.52 10.38 11/2/2017      119,456       2,500     108,536      2,500  6.31 6.37 36.87 37.54 261.51 235.91 4.24 4.87 10.12 10.80 11/3/2017      124,071       2,500     133,721      2,500  7.57 7.21 44.13 41.78 259.92 225.34 4.75 5.26 11.29 11.28 11/4/2017      124,843       2,500     165,945      2,500  7.96 12.64 46.34 72.04 210.06 176.48 4.86 8.47 9.93 15.32 11/5/2017      121,247       2,500     146,846      2,500  6.96 7.95 40.61 45.72 258.11 192.21 4.35 5.43 10.30 10.42 211  Mill Calculated Ratios - Plant 2 Date Work Index SAG 1     F80   microns  SAG 1     T80   microns  SAG 2     F80   microns  SAG 2     T80   microns  SAG 1      kW-h/t SAG 2     kW-h/t SAG 1   Wio SAG 2  Wio BM 1    P80  microns BM 2    P80  microns BM  1     kW-h/t BM  2     kW-h/t BM 1 Wio BM 2 Wio 11/6/2017      168,550       2,500     186,150      2,500  7.13 9.73 40.61 55.01 228.26 176.62 4.54 6.58 9.83 11.92 11/7/2017      128,234       2,500     161,963      2,500  7.32 7.55 42.51 43.13 265.47 207.71 4.55 5.24 11.01 10.60 11/8/2017      129,445       2,500     138,044      2,500  6.77 6.30 39.33 36.42 280.20 245.59 4.68 4.69 11.77 10.71 11/9/2017      117,086       2,500     109,612      2,500  6.06 6.12 35.50 36.07 327.84 290.91 3.98 4.42 11.30 11.44 11/10/2017      116,207       2,500     133,896      2,500  6.30 6.90 36.94 39.95 299.70 272.04 4.12 4.79 10.91 11.79 11/11/2017      127,618       2,500     123,709      2,500  6.82 6.68 39.63 38.92 290.44 267.35 4.33 4.61 11.20 11.19 11/12/2017      126,531       2,500     131,105      2,500  7.50 8.41 43.64 48.79 228.14 201.44 4.75 5.52 10.29 10.94 11/13/2017      133,634       2,500     134,550      2,500  6.75 6.67 39.11 38.61 255.90 252.73 4.27 4.56 10.05 10.64 11/14/2017      209,334       2,500     125,079      2,500  6.58 5.79 36.91 33.74 276.45 260.33 4.36 4.37 10.85 10.41 11/15/2017      138,938       2,500     120,291      2,500  3.89 0.98 22.44 5.74   257.36 2.83 4.58   10.83 11/16/2017      127,150       2,500     132,361      2,500  7.23 4.63 42.05 26.86 238.62 277.36 4.77 4.67 10.67 11.65 11/17/2017      128,102       2,500     133,730      2,500  6.73 6.09 39.11 35.28 283.62 225.95 4.29 4.19 10.89 9.00 11/18/2017      122,428       2,500     120,147      2,500  6.61 6.54 38.57 38.23 270.55 227.29 4.26 4.60 10.45 9.92 11/19/2017      129,130       2,500     125,298      2,500  7.04 6.90 40.92 40.18 262.45 231.52 4.49 4.74 10.76 10.36 11/20/2017      137,029       2,500     126,274      2,500  6.54 6.61 37.80 38.46 280.31 243.64 4.13 4.51 10.41 10.25 11/21/2017      137,053       2,500     133,387      2,500  6.37 6.60 36.84 38.22 282.34 246.76 4.09 4.56 10.35 10.45 212  Mill Calculated Ratios - Plant 2 Date Work Index SAG 1     F80   microns  SAG 1     T80   microns  SAG 2     F80   microns  SAG 2     T80   microns  SAG 1      kW-h/t SAG 2     kW-h/t SAG 1   Wio SAG 2  Wio BM 1    P80  microns BM 2    P80  microns BM  1     kW-h/t BM  2     kW-h/t BM 1 Wio BM 2 Wio 11/22/2017      133,624       2,500     136,787      2,500  6.74 6.81 39.05 39.35 298.88 275.71 4.52 5.03 11.94 12.50 11/23/2017      129,680       2,500     154,166      2,500  6.91 7.13 40.10 40.87 236.80 222.39 4.48 5.03 9.95 10.68 11/24/2017      137,810       2,500     129,323      2,500  6.84 6.70 39.54 38.93 258.87 237.27 4.35 4.65 10.32 10.34 11/25/2017      145,367       2,500     144,700      2,500  6.73 7.19 38.75 41.41     4.23 4.94     11/26/2017      135,650       2,500     129,545      2,500  6.66 6.73 38.52 39.10 275.29 217.66 4.25 4.65 10.56 9.73 11/27/2017      127,339       2,500     133,811      2,500  6.80 7.31 39.56 42.31 278.75 228.80 4.20 4.93 10.52 10.70 11/28/2017      124,409       2,500     150,869      2,500  7.20 7.63 41.94 43.77 266.41 222.49 4.42 5.44 10.71 11.57 11/29/2017      121,404       2,500     134,838      2,500  6.38 6.56 37.27 38.00 252.13 250.49 4.16 4.61 9.68 10.67 11/30/2017      130,308       2,500     122,076      2,500  6.39 6.11 37.06 35.63 281.76 277.33 4.19 4.59 10.58 11.47 12/1/2017         82,885       2,500     126,179      2,500  6.83 0.35 41.31 2.01 285.41 258.72   5.19 0.00 12.31 12/2/2017      137,881       2,500     160,039      2,500  10.69 10.50 61.79 59.97 177.11 168.66 6.16 6.94 11.17 12.17 12/3/2017      151,270       2,500     178,517      2,500  11.72 11.13 67.24 63.10 157.98 145.43 6.69 6.88 11.23 10.93 12/4/2017      104,201       2,500     158,657      2,500  6.94 10.92 41.04 62.42 235.65 170.50 4.34 6.98 9.60 12.33 12/5/2017      115,461       2,500     130,937      2,500  6.13 7.43 35.91 43.13 279.36 244.62 3.91 4.96 9.82 11.29 12/6/2017      129,872       2,500     112,500      2,500  6.44 6.54 37.37 38.43 259.33 258.78 3.98 4.54 9.45 10.77 12/7/2017      124,232       2,500     115,419      2,500  6.51 7.05 37.95 41.32 275.44 248.01 4.09 4.75 10.17 10.93 213  Mill Calculated Ratios - Plant 2 Date Work Index SAG 1     F80   microns  SAG 1     T80   microns  SAG 2     F80   microns  SAG 2     T80   microns  SAG 1      kW-h/t SAG 2     kW-h/t SAG 1   Wio SAG 2  Wio BM 1    P80  microns BM 2    P80  microns BM  1     kW-h/t BM  2     kW-h/t BM 1 Wio BM 2 Wio 12/8/2017      108,238       2,500     131,676      2,500  6.27 7.19 36.99 41.67 269.35 269.11 3.92 4.73 9.58 11.54 12/9/2017      122,174       2,500     128,510      2,500  6.39 7.04 37.31 40.91 296.32 249.76 3.99 4.65 10.48 10.75 12/10/2017      118,199       2,500     119,780      2,500  6.40 6.67 37.44 38.96 282.44 271.23 4.05 4.53 10.25 11.12 12/11/2017      122,641       2,500     128,459      2,500  6.41 6.88 37.40 40.00 289.07 264.91 4.09 4.63 10.53 11.17 12/12/2017      139,003       2,500     131,972      2,500  7.15 7.15 41.27 41.44 265.74 241.39 4.45 4.88 10.77 11.01 12/13/2017      132,293       2,500     149,629      2,500  6.52 7.80 37.79 44.77 271.32 248.13 4.15 5.18 10.19 11.92 12/14/2017      126,852       2,500     140,875      2,500  6.17 6.59 35.88 38.01 287.33 253.23 4.07 4.53 10.43 10.58 12/15/2017      140,785       2,500     163,326      2,500  7.04 8.00 40.63 45.64 267.83 228.49 4.49 5.32 10.92 11.52 12/16/2017      140,378       2,500     138,839      2,500  6.80 7.41 39.23 42.78 267.84 203.71 4.34 4.82 10.55 9.62 12/17/2017      126,875       2,500     133,987      2,500  6.64 7.32 38.64 42.42 268.45 210.48 4.26 4.88 10.37 9.96      

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