1. Is the Python Right for Me? Python Amenability Test Work Gravity Gold 2010 Tim Hughes, Ken Donaldson, Ben Murphy

2. Outline Underground Processing and Python Python Flowsheet Testing for Python – VSI Amenability – Continuous Gravity Recovery – Flotation

3. Underground Gold Processing Potential Benefits Haulage reduction Less waste handling Smaller surface footprint Lower cut off grade

4. Designed for mobility and flexibility Pre-concentration focus 5 dry modules, 6 wet modules, 2 electrical The Python

5. Python Flowsheet

6. Why Gravity and Flotation?

7. Python Amenability Testing Mineralogy Bond Impact Crushing Work Index Bond Abrasion Index Vertical Shaft Impactor Amenability Continuous Gravity Recovery Flotation Recovery Concentrate Treatment Concentrate Handling Tailings Testing

8. Python Throughput

9. Single Pass VSI Amenability Test

10. Continuous Gravity Recovery Test Table Test Cleaner Table VSI P100 600 µm P100 ~ 1.18mm Conc. Tail Conc.

11. Gravity Yield-Recovery Curve

12. Flotation Testing Bulk float Typical Reagents: PAX, CuSO 4 and frother 4 x 30s concentrates 2 x 5min concentrates – ultimate recovery Yield - Recovery

13. Flotation of Gravity Tails Recovery by Gravity Gold recovery by gravity only 81% into ~15% mass Combined gravity and float recovery around 96% Au into ~15% mass Flotation recovery-yield data

14. Combined Gravity and Flotation

15. Summary Underground pre-concentration has a number of operational benefits and savings. Gekko’s Python utilises fine crushing, gravity separation and flotation to maximise these benefits. Gekko has developed a robust group of laboratory tests to assess an ore’s suitability for Python processing. A large proportion of ores tested have been amenable to the Python flowsheet.

16. Introduction QUESTIONS ?