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

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

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

Boddington Open Pit 00/00/00

North Pit Waste Dump

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South Pit

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Ultimate Pit

Ultimate Pit Dimensions

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Length: ~4,000 m

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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.

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Pit Geology If notes are needed they are Arial 10pt.

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Mining Fleet Placeholder for Rope shovel

Shovel Dipper 00/00/00 Place title of presentation here 8

Drill and Blast Fleet Needs decent picture with dust skirts If notes are needed they are Arial 10pt.

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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.

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Grade Control Requirements

Jan Feb Mar Apr May Jun Jul Month Aug Sep Oct Nov Dec ROM MG Waste

55% of 2014 total movement is Ore 00/00/00 Place title of presentation here 11

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 12

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 00/00/00 Place title of presentation here 13

Blasthole Sampling Systems Considered 00/00/00 Place title of presentation here 14

Auger Sampling - Augers 00/00/00 Place title of presentation here 15

Auger Sampling - Technique 00/00/00 Place title of presentation here 16

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.

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Electronic Data Capture 00/00/00 Place title of presentation here 18

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 19

Sample Protocol Testing

Sample Protocol Test Results

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1.00

If notes are needed they are Arial 10pt.

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0.10

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Auger Sample Au (g/t)

• • 00/00/00 Auger Possibly Biased low at low grades (<0.2g/t) Generally within the variability of the lot Place title of presentation here 10.00

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100 10 1 Ongoing QAQC - Field Duplicates Text starts here, 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 0.1

If notes are needed they are Arial 10pt.

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0.01

0.10

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Log of Primary Sample

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100.00

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Particle Size Sensitivity 1 0.9

0.8

0.7

0.6

0.5

0.4

0.3

0.2

0.1

0 <0.425

0.425

0.85

Au Grade by Size Fraction % Au Metal by Size Fraction

2.36

3.35

Size Fraction (mm)

4.75

6.7

9.5

12.5

<0.425

0.425

0.85

2.36

3.35

Size Fraction (mm)

4.75

6.7

9.5

12.5

20.00% 15.00% 10.00% 5.00% 0.00% 50.00% 45.00% 40.00% 35.00% 30.00% 25.00% 00/00/00 Place title of presentation here 22

110% Mill Reconciliation

Delivered to Mill/Recieved at Mill 3 Month Rolling

105% 100% 95% 90% Jan-12 Feb-12 Mar-12 Apr-12 May-12 Oz Jun-12 5% Lines Jul-12 Aug-12 5% Lines Sep-12 Oct-12 Nov-12 Dec-12 00/00/00 Place title of presentation here 23

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

Definition drilling.

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RC – Blasthole Comparison pattern • Tight spaced RC drilling on 10m Centres(Green) with 2m Samples • Blastholes Sampled (Red) 25 00/00/00 Place title of presentation here

RC – Blasthole Comparison - Nearest Hole 100

RC 14m Composite vs. nearest BH

10 1 0.1

0.1

1

Blasthole Au (g/t)

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RC – Blasthole Comparison Complete Blast Note: No Change of Support conducted 00/00/00 Place title of presentation here 27

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.

If notes are needed they are Arial 10pt.

Operational Impact of 4-5 Grade Control RC rigs Is there an issue to resolve?

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Blasthole Sampling Delivery Assayed Total 303,919 Safety or Loaded 956 Trashed Contaminated 3,430 999 Sampling Issues 4,745 Not Sampled

Total

5,680

319,729

Percentage 95.06% 0.30% 1.07% 0.31% 1.48% 1.78% • 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 29

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 If notes are needed they are Arial 10pt.

• • Ensure it is supported by RC drilling where required Management Buy-In.

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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.

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Globally the Industry needs an automated, reliable blasthole sampling system.

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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.

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