Boddington Gold
Blasthole Sampling at Newmont
Boddington Gold
Sampling 2013 – Brisbane May 2013
Newmont Boddington Gold
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Geological Setting
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Boddington Open Pit
North
Pit
South
Pit
Waste
Dump
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Ultimate Pit
Ultimate Pit Dimensions
 Length: ~4,000 m
 Width: ~1,000 m
 Depth: ~700 m
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Image of the skyscraper, Burj Khalifa Dubai, to depict the future depth of the Boddington pit.
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Pit Geology
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Mining Fleet
Placeholder for Rope shovel
Shovel Dipper
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Drill and Blast Fleet
Needs decent picture with dust skirts
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Arial 10pt.
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Boddington Mill
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Level 2, Arial 20pt
Level 3, Arial 14pt
Level 4, Arial 14pt
Level 5, Arial 14pt
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Tonnes
Grade Control Requirements
ROM
MG
Waste
Jan Feb Mar Apr May Jun
Jul
Aug Sep Oct Nov Dec
Month
55% of 2014 total
movement is Ore
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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
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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
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Auger Sampling - Technique
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Auger Sampling - Theory
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Level 2, Arial 20pt
Level 3, Arial 14pt
Level 4, Arial 14pt
Level 5, Arial 14pt
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needed they are
Arial 10pt.
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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
Sample Protocol Test Results
Rotary Split Au (g/t)
10.00
1.00
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0.10
0.10
1.00
10.00
Auger Sample Au (g/t)
•
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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
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Log-Log Chart
Field Duplicate
Level
2, ofArial
20ptResults 2012
100
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Level 5, Arial 14pt
• 2,434 Field Duplicates in
2012 (~8% of samples
duplicated)
Log of Field Duplicate
10
1
• Between 0.1g/t and 1g/t Au
•
•
0.1
85% of Samples <0.1g/t error
95% of Samples <0.2g/t error
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needed they are
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0.01
0.01
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1.00
10.00
100.00
Log of Primary Sample
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Particle Size Sensitivity
Au Grade by Size Fraction
1
0.9
0.8
% Au Metal by Size Fraction
50.00%
0.7
45.00%
40.00%
0.5
35.00%
0.4
0.3
30.00%
0.2
25.00%
0.1
20.00%
Au Metal (%)
Au Grade (ppm)
0.6
15.00%
0
<0.425
0.425
0.85
2.36
3.35
4.75
6.7
9.5
12.5
Size Fraction (mm)
10.00%
5.00%
0.00%
<0.425
0.425
0.85
2.36
3.35
4.75
6.7
9.5
12.5
Size Fraction (mm)
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Mill Reconciliation
Delivered to Mill/Recieved at Mill
3 Month Rolling
110%
105%
100%
95%
90%
Jan-12
Feb-12
Mar-12
Apr-12
May-12
Oz
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Jun-12
5% Lines
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Jul-12
Aug-12
Sep-12
Oct-12
Nov-12
Dec-12
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.
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needed they are
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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
RC 14m Composite vs. nearest BH
14m Composite RC Au (g/t)
100
10
1
0.1
0.1
1
10
100
Blasthole Au (g/t)
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)
Estimated Cost increase requires ~3-5% mill
head grade increase to cover.
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needed they are
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Operational Impact of 4-5 Grade Control RC
rigs
Is there an issue to resolve?
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Blasthole Sampling Delivery
Total
Assayed
303,919
Percentage
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
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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;
•
•
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•
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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.
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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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