1. CIMExcel Software Inc. Slide 1 Optimal Mineral Processing Control (OMPC) for Pit-to-Plant Optimization

2. CIMExcel Software Inc. Slide 2 Optimal Mineral Processing Control (OMPC) for Pit-to-Plant Optimization Increases Stability and Reduces Variability. Increases Ore Throughput and Metal Recovery. Increased Throughput 3 - 5 % Increased Recovery 1 - 2 %

3. CIMExcel Software Inc. Slide 3 OMPC Input - Output Variables OMPC

4. CIMExcel Software Inc. Slide 4 Optimal Mineral Processing Control (OMPC) - Features Conventional PID with Feedforward Control Discrete-time Control Non-linear Model Reference Control Modal Control Advanced Hill-Climbing Optimization Continuous Response Identification and Learning Model-based Virtual Measurements Advanced Signal Analysis and Process Variable Filtering Accurate Dynamic Models for Design and Testing Implemented in a DCS and a PC (via OPC)

5. CIMExcel Software Inc. Slide 5 OMPC Pit-to-Plant Optimization Variables Drill Hardness, Blast Pattern, and Powder Factor Tracking Primary Crusher Discharge Ore Size Distribution Primary Mill Feeder Ratios Primary Mill Feedrate Primary Mill Feedrate - Rate of Change Primary Mill Solids and Speed Primary Mill Steel Charge and Size (long term) Ball Mill Steel Charge and Size (long term) Ball Mill Solids and Speed Flotation Solids and Grinds Flotation Air and Reagents Ratios and Cell Levels

6. CIMExcel Software Inc. Slide 6 OMPC Pit-to-Plant Optimization - Manipulated Variables Blast Pattern and Powder Factor (long term) Primary Crusher Gap Feeder Speeds Feedrate and Rate of Change Primary Mill Solids Primary Mill Speed Cyclone Scheduling (Active Cyclones) Cyclone UF and OF Water Addition CFPB Water Addition Flotation Air Flow and Reagents Valves Flotation Cell Level Valves

7. OMPC CIMExcel Software Inc. Slide 7 OMPC – Other Features Primary Crusher Performance Analysis Primary Mill Performance Analysis Ball Mill - Cyclones Performance Analysis Flotation Performance Analysis Primary Mill Dynamic Response Model Conventional DCS PID Control Loops with Feedforward Discrete-time Control Loops Primary Mill Dual Power-Pressure Control with Ore Quality Feedforward Stockpile - Feeders Ore Size Classification Identification Primary Mill Design/Equipment Performance Improvement Analysis (feed, steel, lifters, liners, grate, motors)

8. OMPC CIMExcel Software Inc. Slide 8 OMPC - Increased Ore Throughput ~ 5% A and B Primary Mills are identical and are fed equally from the same stockpile. A-line has OMPC turned on, B-line does not. A-line averages 951 Tph. B-line averages 901 Tph.

9. OMPC CIMExcel Software Inc. Slide 9 OMPC - Increased Metal Recovery ~ 2 % A1 and A2 Ball Mill - Cyclones - Flotation sides are identical and are fed equally from the same primary mill with the same particle size distributions. A1-side has OMPC - Cyclone Scheduling turned on, A2-side does not. Both sides have OF Density Optimization, Feedforward Air Ratio, and Reagents Flow Ratio turned on. A1-side averages 89.8 % recovery efficiency. A2-side averages 87.6 % recovery efficiency.

10. OMPC CIMExcel Software Inc. Slide 10 OMPC - Integrated Conventional and Advanced Control Conventional Control (implemented in DCS/PLC via ST): Ore Quality Analysis Feeder Speed SAG / AG Mill Dual Power - Load Control with Feedforward Ore Quality - discrete time SAG / AG Mill Speed SAG / AG Mill Water Ratio SAG / AG Mill Water Addition SFPB and CFPB Level Cyclone - Underflow and Overflow Water Addition Flotation - Air Flow and Reagents Flow Lube Systems Temperature (with Feedforward) Advanced Control (external PC via OPC): Feeder Modal Control SAG / AG Feedrate, Water Ratio, and Mill Speed Cyclone Scheduling Cyclone - Overflow Solids Flotation - Air Flow and Reagents Feedforward Flotation Cell Levels - Multivariable Nonlinear Model Reference Modal Control with Feedforward and Dynamic Observer

11. OMPC CIMExcel Software Inc. Slide 11 OMPC - Primary Mill Control Ore Quality Analysis and Feedforward Control for Feedrate, Solids, and Speed Short-term Ore Quality Stabilization Feeder Modal Control Advanced Hill-Climbing Optimization for Feedrate, Solids, and Speed Overload Prediction and Prevention Grindout Optimization Ore Load Control Mode Feedrate Rate of Change Optimization Feedrate and Power Constraints Mode Dynamic Grinding Rate Model Continuous Response Identification and Learning

12. OMPC CIMExcel Software Inc. Slide 12 OMPC – Primary Mill Control and Optimization Advanced Hill-Climbing Feedrate rate of change constraints Feeder Modal Control Short-term Ore Quality Stabilization Overload Prediction Grinding Rate Model Feeder Speed Controllers Power-Feedrate Constraints Ore Quality Analysis Ore Quality Feedforward Ore Load Control Grindout Optimization Identification and Learning Primary Mill Water Flow Setpoint Primary Mill Speed Controller Solids Optimization Speed Optimization

13. Pit Blasting and Primary Crusher Operations OMPC CIMExcel Software Inc. Slide 13

14. OMPC CIMExcel Software Inc. Slide 14 OMPC - Ore Quality Feedforward Control The particle size distributions for the relative toughness (RT = 0.8, 1.0, 1.2) are determined from belt cut testing and correlation with the Ore Size Analyzer data. The realtime Ore Size Analyzer data is used to determine the current value of the Relative Toughness. The Relative Toughness, the current steel load, and the time from the last lifter/liner rebuild are used to determine the Maximum Feedrate. OMPC uses the Maximum Feedrate value as the remote setpoint to the Feedrate Control Loop.

15. OMPC CIMExcel Software Inc. Slide 15 OMPC - Primary Mill Performance Analysis

16. OMPC CIMExcel Software Inc. Slide 16 Optimal Mineral Processing Control (OMPC) - Primary Mill Analysis and Optimization

17. OMPC CIMExcel Software Inc. Slide 17 Optimal Mineral Processing Control (OMPC) Advanced Hill-Climbing Optimization

18. Optimal Mineral Processing Control (OMPC) Feeders Modal Identification OMPC CIMExcel Software Inc. Slide 18

19. Optimal Mineral Processing Control (OMPC) Feeders Modal Control OMPC CIMExcel Software Inc. Slide 19

20. OMPC CIMExcel Software Inc. Slide 20 OMPC - Ball Mill - Cyclones - Flotation Control Ball Mill Solids - Cyclone Scheduling Hill-Climbing Optimization for Flotation Solids and Grinds Flotation Flow - Flotation Air and Regents Ratio - Recovery Efficiency Analysis (at constant Flotation Solids and Grinds) Overall Recovery Efficiency Analysis and Optimization Flotation Air and Regents Ratio Feedforward Control Multi-line Ball Mill - Cyclone Hill-Climbing Optimization Ball Mill Overload Prediction and Prevention Comprehensive Constraints Cell Levels - Multivariable Non-linear Model Reference Modal Control with Comprehensive Feedforward and Dynamic Observer

21. OMPC CIMExcel Software Inc. Slide 21 OMPC – Recovery Optimization Cyclone Scheduling and Optimization Flotation Solids Control and Optimization Flotation (Air and Reagents) Feedforward Control Flotation Levels – Multivariable Nonlinear Model Reference Modal Control with Comprehensive Feedforward and Dynamic Observer

22. OMPC CIMExcel Software Inc. Slide 22 OMPC - Model-based Virtual Measurements Ore Quality Primary Mill Ore Discharge Rate Cyclone Size Partition Flotation Solids

23. OMPC CIMExcel Software Inc. Slide 23 OMPC - Ore Stockpile - Multiple Feeders Material Transport Model

24. OMPC CIMExcel Software Inc. Slide 24 OMPC – SAG / AG Mill Control and Optimization

25. OMPC CIMExcel Software Inc. Slide 25 OMPC - SAG / AG Mill Advisory Control Mode

26. OMPC CIMExcel Software Inc. Slide 26 OMPC – Ore Quality Analysis

27. OMPC CIMExcel Software Inc. Slide 27 OMPC – Pit-to-Plant Ore Size Reduction

28. OMPC CIMExcel Software Inc. Slide 28 OMPC – Primary Mill Ore Size Reduction Model

29. OMPC CIMExcel Software Inc. Slide 29 OMPC – Ball Mill – Cyclone Models

30. OMPC CIMExcel Software Inc. Slide 30 OMPC – Primary Mill Performance Analysis

31. OMPC CIMExcel Software Inc. Slide 31 OMPC - Pebble Crusher Models

32. Flotation Cell Levels - Non-linear Model Reference Modal Control Q slurry in ÷ f i -1 () Hysteresis Compensator valve position V j Feedforward Dynamic Observer PI actuator positioner U j Level Setpoints Operator Fixed Feed Dependent Startup/Shutdown Level i Q air i Solids in Level i Q air i LiLi + - + + OMPC CIMExcel Software Inc. Slide 32

33. Cyclones 5 -> 6 -> 4 -> 5, Solids in MANUAL Control, Air Flow in Flow Ratio Control Flotation Cell Levels - Non-linear Model Reference Modal Control OMPC CIMExcel Software Inc. Slide 33