Harmony Gold Mining Co. Ltd. · JSE:HAR

Harmony Gold Mining — Technical Presentation (March 2011)

8 slides from Harmony Gold Mining's technical presentation, March 2011

  1. Slide 1: Hidden Valley Processing – Recovery Improvement

    Hidden Valley Processing Recovery Improvement

  2. Slide 2: Flowsheet

    Flowsheet WN /\ MOROBE MMV SIMPLIFIED PROCESS FLOW SHEET pea MININ ae Mil " Flotation Cells a Faleon Cond TK hy CN IFLOCAHEOR Re grind Mill Strip Solution Heat exchanger a ——— carbon son Kil Carbon Regeneration Kiln _— Carbon Scrubber TSF retum, water Clarifier Degrator == P15°) Precipitation Filter

  3. Slide 3: Hidden Valley Improvement: Gold and Silver Recovery

    Hidden Valley Improvement Gold Recovery Planned recovery Silver Recovery Planned recovery 88% 70% 75% 100% Ag Recovery% Gold Recovery% 90% 50% 53% 80% 85% 39% 25% 77% 70% 26% 73% 22% 71% 0% 60% 10 10 11 11 10 10 11 11 EJ EJ EJ EJ EJ EJ EJ EJ 3Y 4Y 1Y 2Y 3Y 4Y 1Y 2Y Q Q Q Q 3 Q Q Q Q

  4. Slide 4: Recovery Improvement by Circuit Stage

    % Recovery 0 20 40 60 80 100 Q 1 20 10 N ew Ba se G ra v ity Fl o at C on c. Le ac h Recovery Improvement C IL Gold Pr ec ip Silver

  5. Slide 5: Recovery Improvement: What did we do?

    Recovery Improvement • What did we do? – Training. Specialist training and met support – Flotation testing. Improved reagent scheme, optimised mass pull. – Automate pH control in CIL and con leach – Leach testing, improved reagent control and response to ore characteristics. – Elution debottleneckin

  6. Slide 6: Recovery Improvement: further work toward 90% Au and 70% Ag

    Recovery Improvement It does not stop, further work to achieve 90% Au and 70% Ag recovery. • Circuit stability – Asset Management and increased MTBS – Feed blending for consistency – Control and response - Operator Training • Further Enhance Gravity Recovery – Fluidisation water – Increased feed rat

  7. Slide 7: Recovery Improvement: Flotation, Concentrate Leach/CCD and CIL

    Recovery Improvement • Flotation – Reagent automation and optimisation – Froth cameras and control improvement – Increasing mass pull • Concentrate Leach/CCD – Oxygen addition improvements – Automate cyanide addition – Density control – Increase washing capacity • CIL – Regeneration circuit optimisa

  8. Slide 8: Hidden Valley Mine

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