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Boddington Gold
Blasthole Sampling at Newmont Boddington Gold
Sampling 2013 – Brisbane May 2013
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Newmont Boddington Gold
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Geological Setting
Boddington Open Pit
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North Pit
South Pit
Waste Dump
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Ultimate Pit
If notes are needed they are Arial 10pt.
Ultimate Pit Dimensions Length: ~4,000 m Width: ~1,000 m Depth: ~700 m
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.
Mining Fleet
Placeholder for Rope shovel
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Shovel Dipper
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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 14ptLevel 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 Aug Sep Oct Nov Dec
Tonn
es
Month
ROM
MG
Waste
55% of 2014 total movement is Ore
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.
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• Auger Sampling Selected
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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
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Blasthole Sampling Systems Considered
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Auger Sampling - Augers
Auger Sampling - Technique
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Auger Sampling - Theory
Text starts here, Arial 20pt.Level 2, Arial 20pt
Level 3, Arial 14ptLevel 4, Arial 14pt
Level 5, Arial 14pt
If notes are needed they are Arial 10pt.
Electronic Data Capture
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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
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Sample Protocol Testing
If notes are needed they are Arial 10pt.
0.10
1.00
10.00
0.10 1.00 10.00
Rota
ry S
plit
Au (g
/t)
Auger Sample Au (g/t)
Sample Protocol Test Results
• Auger Possibly Biased low at low grades (<0.2g/t)• Generally within the variability of the lot
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Ongoing QAQC - Field Duplicates
Text starts here, Arial 20pt.Level 2, Arial 20pt
Level 3, Arial 14ptLevel 4, Arial 14pt
Level 5, Arial 14pt
If notes are needed they are Arial 10pt.
• 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
0.01
0.1
1
10
100
0.01 0.10 1.00 10.00 100.00
Log
of F
ield
Dup
licat
e
Log of Primary Sample
Log-Log Chart of Field Duplicate Results 2012
Particle Size Sensitivity
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0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
12.59.56.74.753.352.360.850.425<0.425
Au G
rade
(ppm
)
Size Fraction (mm)
Au Grade by Size Fraction
0.00%
5.00%
10.00%
15.00%
20.00%
25.00%
30.00%
35.00%
40.00%
45.00%
50.00%
12.59.56.74.753.352.360.850.425<0.425
Au M
etal
(%)
Size Fraction (mm)
% Au Metal by Size Fraction
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Mill Reconciliation
90%
95%
100%
105%
110%
Jan-12 Feb-12 Mar-12 Apr-12 May-12 Jun-12 Jul-12 Aug-12 Sep-12 Oct-12 Nov-12 Dec-12
Delivered to Mill/Recieved at Mill 3 Month Rolling
Oz 5% Lines 5% Lines
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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.
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RC – Blasthole Comparison pattern
• Tight spaced RC drilling on 10m Centres(Green) with 2m Samples
• Blastholes Sampled (Red)
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RC – Blasthole Comparison - Nearest Hole
0.1
1
10
100
0.1 1 10 100
14m
Com
posi
te R
C Au
(g/t
)
Blasthole Au (g/t)
RC 14m Composite vs. nearest BH
Note: No Change of Support conducted
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RC – Blasthole Comparison Complete Blast
Note: No Change of Support conducted
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RC vs. BH Drilling Business Case
Technical Excellence is not a Business Case(Dunham 2012)
If notes are needed they are Arial 10pt.
Estimated Cost increase requires ~3-5% mill head grade increase to cover.
Operational Impact of 4-5 Grade Control RC rigs
Is there an issue to resolve?
Blasthole Sampling Delivery
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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%
Total 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
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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.
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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.
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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