Robert Barr - RAVE Audio Visual

Report
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
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
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needed they are
Arial 10pt.
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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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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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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
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
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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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needed they are
Arial 10pt.
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
Text starts here, Arial 20pt.
Log-Log Chart
Field Duplicate
Level
2, ofArial
20ptResults 2012
100
Level 3, Arial 14pt
Level 4, Arial 14pt
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
If notes are
needed they are
Arial 10pt.
0.01
0.01
0.10
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.
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
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.
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
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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needed they are
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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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