Blasthole Sampling at Newmont B oddington Gold

1. Blasthole Sampling at Newmont Boddington Gold Sampling 2013 – Brisbane May 2013

2. Newmont Boddington Gold Place title of presentation here

3. Geological Setting Place title of presentation here

4. Boddington Open Pit North Pit South Pit Waste Dump Place title of presentation here

5. Ultimate Pit • Ultimate Pit Dimensions • Length: ~4,000 m • Width: ~1,000 m • Depth: ~700 m If notes are needed they are Arial 10pt. Image of the skyscraper, Burj Khalifa Dubai, to depict the future depth of the Boddington pit. Place title of presentation here

6. Pit Geology If notes are needed they are Arial 10pt. Place title of presentation here

7. Mining Fleet • Placeholder for Rope shovel

8. Shovel Dipper Place title of presentation here

9. Drill and Blast Fleet • Needs decent picture with dust skirts If notes are needed they are Arial 10pt. Place title of presentation here

10. Boddington Mill • Text starts here, Arial 20pt. • Level 2, Arial 20pt • Level 3, Arial 14pt • Level 4, Arial 14pt • Level 5, Arial 14pt If notes are needed they are Arial 10pt. Place title of presentation here

11. Grade Control Requirements 55% of 2014 total movement is Ore Place title of presentation here

12. Key Challenges for Sampling • Safe – Minimise Exposure to High risks • Costs – High Volume Low Cost • Accuracy – Low Head Grade, requires Accurate, Precise Sampling. 1-2% increase in mill head grade delivers big benefits • Fast – Keep the Pit working. • Auger Sampling Selected Place title of presentation here

13. Blasthole Spacing and Minimum Mining Size • Blasthole Spacing • 5m x 6.2m • Kriged Blocks • 5m x 5m x 6m • Minimum Mining Size 20m x 20m x 12m Bench Height Place title of presentation here

14. Blasthole Sampling Systems Considered Place title of presentation here

15. Auger Sampling - Augers Place title of presentation here

16. Auger Sampling - Technique Place title of presentation here

17. H Auger Sampling - Theory • Text starts here, Arial 20pt. • Level 2, Arial 20pt • Level 3, Arial 14pt • Level 4, Arial 14pt • Level 5, Arial 14pt If notes are needed they are Arial 10pt. Place title of presentation here

18. Electronic Data Capture Place title of presentation here

19. Sample Protocol Testing • Hole drilled through Tarpaulin to prevent contamination. • 5 Auger Samples taken (1 for Production, 4 for test work) • 2 Spear Samples for comparison • Remainder Alternate Shovelled to 5 piles • 1 Pile Selected at random (post shovelling) and dispatched for rotary splitting. • 11 sub samples split and assayed. • Remainder of pile reserved for CRM generation Place title of presentation here

20. Sample Protocol Testing • Auger Possibly Biased low at low grades (<0.2g/t) • Generally within the variability of the lot If notes are needed they are Arial 10pt. Place title of presentation here

21. Ongoing QAQC - Field Duplicates • Text starts here, Arial 20pt. • Level 2, Arial 20pt • Level 3, Arial 14pt • Level 4, Arial 14pt • Level 5, Arial 14pt • 2,434 Field Duplicates in 2012 (~8% of samples duplicated) • Between 0.1g/t and 1g/t Au • 85% of Samples <0.1g/t error • 95% of Samples <0.2g/t error If notes are needed they are Arial 10pt. Place title of presentation here

22. Particle Size Sensitivity Place title of presentation here

23. Mill Reconciliation Place title of presentation here

24. Boddington and RC drilling • Rock Strength – 150-250Mpa • Historic Low Penetration rates (>15 years experience on site with multiple contractors) • Diamond almost same meterage cost for Resource Definition drilling. If notes are needed they are Arial 10pt. Place title of presentation here

25. RC – Blasthole Comparison pattern • Tight spaced RC drilling on 10m Centres(Green) with 2m Samples • Blastholes Sampled (Red) Place title of presentation here

26. RC – Blasthole Comparison - Nearest Hole Note: No Change of Support conducted Place title of presentation here

27. RC – Blasthole Comparison Complete Blast Note: No Change of Support conducted Place title of presentation here

28. RC vs. BH Drilling Business Case • Technical Excellence is not a Business Case • (Dunham 2012) Estimated Cost increase requires ~3-5% mill head grade increase to cover. Operational Impact of 4-5 Grade Control RC rigs If notes are needed they are Arial 10pt. Is there an issue to resolve? Place title of presentation here

29. Blasthole Sampling Delivery • 95% of blastholes with sampling assigned sampled project to date. • Minimal Sampling issues (Wet holes/Small collars) • Minimal Shovel downtime “Waiting for Markup” (<30hrs in 2012) • Good Reconciliation Place title of presentation here

30. Blasthole Sampling Summary • Blasthole Sampling can work given; • The Right Deposit • The Right Sampling System – tested and verified at that site • Ongoing test work and evaluation • Ensure it is supported by RC drilling where required • Management Buy-In. If notes are needed they are Arial 10pt. Place title of presentation here

31. Are Augers the answer? • Potential Overextension Injuries in Samplers/Technicians if poor techniques employed. • Experienced at 3 mines where system is used. • Can be managed but limits time in role and recruiting pool. Place title of presentation here

32. Globally the Industry needs an automated, reliable blasthole sampling system. Place title of presentation here

33. Thanks and Acknowledgements • Dominique François-Bongarçon. • Newmont Boddington Gold Ore Control Team, past and present, especially Letitia Scott, Alison Compton and Jodie Gray. • Newmont Boddington Gold Drill and Blast department. Place title of presentation here