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

2. Newmont Boddington Gold
00/00/00
Place title of presentation here

3. Geological Setting
00/00/00
Place title of presentation here

4. Boddington Open Pit North Pit South Pit Waste Dump 00/00/00
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.
00/00/00
Place title of presentation here

6. Pit Geology
Generally good vertical continuity of grade zones (sub vertical contacts)
Clear lithological boundaries to Dolerites,
If notes are needed they are Arial 10pt.
00/00/00
Place title of presentation here

7. Mining Fleet Placeholder for Rope shovel
Main dig units – 3 x Bucyrus 795HD Rope Shovels, 1 x Terex RH340
Truck Fleet – 40x 795D/F
Production at ~ t/hr from each shovel
Targeting 100mt/yr.

8. Shovel Dipper Indicator of Bucket Size – 3 pass load of a 795 truck
Selectivity as a function of bucket size – similar scale to blasthole sample separation
Single pass of 12m bench – no need to take 2 samples from hole
00/00/00
Place title of presentation here

9. Drill and Blast Fleet Needs decent picture with dust skirts 9 x DML
2 x PV271
5 x D65
If notes are needed they are Arial 10pt.
00/00/00
Place title of presentation here

10. Boddington Mill Text starts here, Arial 20pt. Level 2, Arial 20pt
Boddington Mill – 35-40mt/yr.
Very hard rock, 3 stage crushing with 4 Ball Mills, Float Circuit to 2 CIL trains
Low Grade, throughput is king but grade elevation important
If notes are needed they are Arial 10pt.
00/00/00
Place title of presentation here

11. Grade Control Requirements
55% of 2014 total movement is Ore
00/00/00
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
00/00/00
Place title of presentation here

13. Blasthole Spacing and Minimum Mining Size
5m x 6.2m
Kriged Blocks
5m x 5m x 6m
Minimum Mining Size 20m x 20m x 12m Bench Height
Large number of samples to SMU (14 in this example, usually more)
Precision of boundaries below the drill spacing not important at NBG – bucket size
00/00/00
Place title of presentation here

14. Blasthole Sampling Systems Considered
On Rig Samplers – Weight and Reliability
Pie Trays – Safety
Sectioning – Segregation and Bias, Manual Handling
Spears – Manual Handling,
Rocket Sampler
Mammoth
00/00/00
Place title of presentation here

15. Auger Sampling - Augers
Two types of Augers – Lipped and unlipped
History; Kennecott -> Antamina -> Boddington
Auger on an electric cordless drill.
00/00/00
Place title of presentation here

16. Auger Sampling - Technique
Under Control of Geologists, no extra equipment on drills, allows metadata on collar to be collected (wet, blown out, run over)
“After the fact” – not working around rotating drill strings/rigs
Auger action allows sample to reach bottom of the pile.
Single sample per hole removes vertical mixing issues, (refluxing, sloughing)
00/00/00
Place title of presentation here

17. Auger Sampling - Theory
Text starts here, Arial 20pt.
Level 2, Arial 20pt
Level 3, Arial 14pt
Level 4, Arial 14pt
Level 5, Arial 14pt H
Multiple cuts from the pile (at least 8, target 6kg sample size)
radial towards blasthole
Reduces issues of lateral segregation,
Subdrill material thin
Irregular collars can be accounted for by varying pattern.
If notes are needed they are Arial 10pt.
00/00/00
Place title of presentation here

18. Electronic Data Capture
Pocket Acquire, PDAs, Barcodes
Barcode number used in lab.
00/00/00
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
00/00/00
Place title of presentation here

20. Sample Protocol Testing
If notes are needed they are Arial 10pt.
Auger Possibly Biased low at low grades (<0.2g/t)
Generally within the variability of the lot
00/00/00
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.
00/00/00
Place title of presentation here

22. Particle Size Sensitivity
Small Project in 2012 checking where the grade sit sin the bulk sample.
Worried by the peaks in higher grade samples.
Checked Metal – looks good for the auger.
Discovered were in the middle of bit trial giving 2 completely different particle populations, and very different to protocol test work
00/00/00
Place title of presentation here

23. Mill Reconciliation
00/00/00
Place title of presentation here

24. Boddington and RC drilling
Rock Strength – Mpa
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.
00/00/00
Place title of presentation here

25. RC – Blasthole Comparison pattern
Tight spaced RC drilling on 10m Centres(Green) with 2m Samples
Blastholes Sampled (Red)
Poor target selection (all ore grade)
00/00/00
Place title of presentation here

26. RC – Blasthole Comparison - Nearest Hole
Nearest neighbors reasonable correlation (~0.8)
BH biased slightly higher and higher variance
Note: No Change of Support conducted
00/00/00
Place title of presentation here

27. RC – Blasthole Comparison Complete Blast
BH slightly higher, however targets high grades better as wide spaced drilling at southern end over actinolite vein
Note: No Change of Support conducted
00/00/00
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?
00/00/00
Place title of presentation here

29. Blasthole Sampling Delivery
Total
Percentage
Assayed
303,919
95.06%
Safety or Loaded
956
0.30%
Trashed
3,430
1.07%
Contaminated
999
0.31%
Sampling Issues
4,745
1.48%
Not Sampled
5,680
1.78%
319,729
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
00/00/00
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.
00/00/00
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.
00/00/00
Place title of presentation here

32. Globally the Industry needs an automated, reliable blasthole sampling system.
00/00/00
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.
00/00/00
Place title of presentation here