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CIMExcel Software Inc. Slide 1

Advanced Mineral Processing Control (AMPC). Increases Stability and Reduces Variability. Increases Ore Throughput and Metal Recovery. Increased Throughput 3 - 5 %. Increased Recovery 1 - 3 %. SAG / AG Mill Control and Optimization. Cyclone Scheduling and Optimization.

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CIMExcel Software Inc. Slide 1

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  1. Advanced Mineral Processing Control (AMPC) • Increases Stability and Reduces Variability. • Increases Ore Throughput and Metal Recovery. • Increased Throughput 3 - 5 % • Increased Recovery 1 - 3 % • SAG / AG Mill Control and Optimization. • Cyclone Scheduling and Optimization. • Flotation Control and Optimization. • Integrated Conventional and Advanced Control. CIMExcel Software Inc. Slide 1

  2. AMPC - Integrated Conventional and Advanced Control • Conventional Control: • Feeder Speed • SAG / AG Mill Dual Power - Load Control • SAG / AG Mill Speed • SAG / AG Mill Water Ratio • SAG / AG Mill Water Addition • SAG / AG Mill Additives • SFPB and CFPB Level • Cyclone - Underflow and Overflow Water Addition • Ball Mill Additives • Flotation - Air Flow and Reagents Flow • Lube Systems Temperature • Advanced Control: • SAG / AG Feedrate, Water Ratio, and Mill Speed • SFPB and CFPB Level • Lube Systems Temperature • Cyclone Scheduling • Cyclone - Overflow Solids • Flotation - Air Flow and Reagents Flow AMPC CIMExcel Software Inc. Slide 2

  3. AMPC - SAG / AG Mills - Advanced Control • Ore Quality Analysis and Feedforward Control • Advanced Hill-Climbing Optimization • Water Ratio Optimization • Speed Optimization • Ore Load Control Mode • Feedrate and Power Constraints Mode • Grinding Rate Model • Continuous Response Identification and Learning AMPC CIMExcel Software Inc. Slide 3

  4. AMPC - Ore Quality Feedforward Control The Relative Grinding Time, the current steel load, and the time from the last lifter/liner rebuild are used to determine the Maximum Feedrate. AMPC uses the Maximum Feedrate value as the remote setpoint to the Feedrate Control Loop. The particle size distributions for the relative grinding time (RGT = 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 Grinding Time. AMPC CIMExcel Software Inc. Slide 4

  5. AMPC - Ore Quality Feedforward Control In the above, A-line and B-line are fed from the same stockpile. A-line has Ore Quality Feedforward enabled and averages 962 Tph. B-line has conventional Power-Load Control enabled and averages 652 Tph. There is a significant performance improvement with AMPC Ore Quality Feedforward Control. AMPC CIMExcel Software Inc. Slide 5

  6. AMPC - Advanced Hill-Climbing Optimization AMPC CIMExcel Software Inc. Slide 6

  7. AMPC - Increased Ore Throughput ~ 5% AMPC CIMExcel Software Inc. Slide 7

  8. Conventional Power-Load Control Loop For the conventional power-load control loop for the above primary mill power and load performance curves, the operator needs to enter a water ratio value (0.65), a power setpoint value (6700 kw), a load setpoint value (660 psi), a high power feeder cutback value (7100 kw), and a high load feeder cutback value (675 psi). These values are critical and determine the throughput and the operating stability of the primary mill. If feeder cutbacks are encountered - the operator will lower these values, if no feeder cutbacks have been encountered - the operator will raise these values. AMPC CIMExcel Software Inc. Slide 8

  9. Conventional Power-Load Control Loop In the above, A-line and B-line are fed from the same stockpile with moderately varying ore quality. A-line has AMPC - Ore Quality Feedforward Control active and averages 962 Tph. B-line has Conventional Power-Load Control active and averages 652 Tph. There is a significant performance improvement with AMPC Ore Quality Feedforward Control. AMPC CIMExcel Software Inc. Slide 9

  10. AMPC – Recovery Optimization • Cyclone Scheduling and Optimization • Flotation Solids Control and Optimization • Flotation (Air and Reagents) Feedforward Control AMPC CIMExcel Software Inc. Slide 10

  11. AMPC - 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 AMPC - 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. AMPC CIMExcel Software Inc. Slide 11

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