the latest in under-cover gold exploration …...2020/01/21 · detailed mapping (2019) 10...
TRANSCRIPT
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Generating and Advancing BlindTargets Using :An Integrated and Multi-Scale ApproachJames Buskard, Nevada Exploration Inc.January 21, 2020
Hydrogeochemistry
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DisclaimerThis Presentation contains certain "forward-looking statements" including, without limitation, expectations, beliefs, plans and objectives regarding the timing and nature of estimated future exploration, success of exploration activities, and potential transactions and ventures discussed. Among the important factors that could cause actual results to differ materially from those indicated by such forward-looking statements are the risks inherent in mineral exploration, the need to obtain additional financing, environmental permits, the availability of needed personnel and equipment for exploration and development, fluctuations in the price of minerals, and general economic conditions.
Wade A. Hodges, CEO of Nevada Exploration Inc., is the Qualified Person, as defined in National Instrument 43-101, and hasprepared the technical and scientific information contained in this Presentation.
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Frequently Asked QuestionsWhen:CASE STUDY
→ Target
huge amount of information / $
Regional → District
Why:
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Why:
Exploration undercover
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Exploration Value Drivers
SIZE OFTHE PRIZE
CHANCE OFSUCCESS
COST TOTEST
Exploration is a business (must create value)
>x
PERFORMANCE 2009 – 2018*
$0.55 discovered per exploration $1Spent $198B to find $109B
* SOURCE: Schodde (2019)
Exploration Value Drivers
SIZE OFTHE PRIZE
CHANCE OFSUCCESS
COST TOTEST>x
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PredictDetection vs. prediction
Detect
?
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PredictDetection vs. prediction
Detect
GEOCHEMISTRY STILL REQUIRED!
?STILL IMPORTANT: but…
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Matthew Bodnar, CSA Global
~900 x 300 km study area (bigger than Denmark)
~15K samples
Regional-scale geochemistry programsStream sediment sampling in NW BC
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Regional-scale geochemistry programsStream sediment sampling in NW BC
CSA Global Report Nº 110.2018, 18 May 2018
Cu Sb PC3
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Reproduce past successesSee through coverConfirm presence of a mineralCost-effective to use over vast areas
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Orders of magnitude drop in detection limits
New Sampling Media
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New sampling media
Groundwater
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Kidder and Jones, 2017
The universal solvent
Mineralization
Pathfinderelements
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Why is clearDirect indication of minerals + pathfindersGroundwater moves
Bigger footprints = fewer samplesCreates vectors and gradients
Can recharge from depthOften along structuresDetect deeper mineralization
Open up new covered search spacesLowers exploration costsFocus use of more expensive tools
Leybourne & Cameron, 2007
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0.1
1.0
10.0
100.0
1000.0
0.1 1.0 10.0 100.0 1000.0
ALS
Actlabs
South Grass Valley Project2019 Field Duplicates
Au (ppt)
PPT!?N = 198(different labs & instruments)
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How do you collect/prepare/analyze samples?
Noble & Gray (2010)AAG Explore March 2010
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1.0
10.0
100.0
1.0 10.0 100.0
Dupl
icat
e
Original
Repeatable?
Au (ppt)
Kelly Creek Project2016-17 RC Water Duplicates
N = 29
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Explorers need to know:Background concentrationsConcentrations at known depositsAppropriate sample spacing
RequiresRegional context (large datasets)Deposit case studies
Regional-scale sampling
Deposit case studies
What’s anomalous?
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Continental-scale hydrogeochemistry atlas
Aggregated existing data:
>380,000 samples
>30,000 Au analyses
Reid et al. (2019)
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Regional-scale sampling program
Low background concentrationsMulti-order-of-magnitude anomaliesReliably identified 15 of 18 larger-scale Au camps
Gray et al. (2014)
Northern Yilgarn (>2,800 samples)
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Junction (2.3 Moz Au)
1 km x 1 km grid(purpose-drilled holes)
Direction of groundwater flow
Carey et al. (2003)
St. Ives Area,Western Australia
Appropriate sample spacing?
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Carey et al. (2003)
ResultsHigh sample (99th)
Footprint > Deposit(10 ppt @ 5,000 m)
Easily seen with 1 km sample spacing
10 ppt
Direction of groundwater flow
52 ppt
St. Ives Area,Western Australia
Appropriate sample spacing?
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AustraliaCSIRO
Independence Group
Photos:David Gray
Where’s it being used?
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ChileFirst Quantum
Anglo American Chile & Phelps Dodge
Photos:Peter Winterburn
Where’s it being used?
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Botswana and Zambia
First QuantumPhotos:James Kidder
Where’s it being used?
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NevadaNevada Exploration
Where’s it being used?
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Regional↓
Basin↓
Project
Case study
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Starts with regional area selection
100,000 mapped prospects600 gold mines5.6 Moz Au per year (↓40%)250 Moz Carlin Au endowment
80 % of Carlin Au from 3 camps55 % under cover
>200 Moz Au residual endowment
AREASELECTED FORGENERATIVE
EXPLORATION
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Biggest challenge: lack of existing bore holes
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Required: purpose-drilled bore holes
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Regional-scale sampling>6,000 groundwater samples mostlyfrom purpose-drilled sampling bores
Tested around >30 known gold mines
Database defining element distributions and exploration thresholds
Selected three projects to advance
Kelly Creek
Grass Valley
South GrassValley
samples
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On the ground
Cortez
GRASS VALLEY
Kelly Creek
Grass Valley
South GrassValley
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500 km2
Search Space
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Geologic mapping
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Gravity
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Cortez Hills
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366 Samples(mostly purpose-drilled)
Groundwater samples
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366 Samples(mostly purpose-drilled)
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Basin-scale program500 km2 search space$500,000 US program$1,000/km2
RESULTSLow backgroundHigh-contrast anomalies
What comes next?10
Kilometres
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Cortez HillsPipelineGoldrush / Fourmile
Gravity survey (2018)
Air magnetic survey (2018)
Infill groundwater (2018-19)
Soil geochemistry (2018-19)
Detailed mapping (2019)
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10 orientation core holes3.7 km NNW-SSE
Cortez HillsPipelineGoldrush / Fourmile
Gravity survey (2018)
Air magnetic survey (2018)
Infill groundwater (2018-19)
Soil geochemistry (2018-19)
Detailed mapping (2019)
Strat. orientation drilling (2018-19)
TEST: Camp-scale CTGD mineral system
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1km
N
10 orientation core holes3.7 km NNW-SSE
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Geologic model
Classic geologic architecture of a Carlin-type mineral system:• Complex, regional-scale structural fabric with multiple structural trap sites• Thick package of reactive lower-plate exhibiting significant brecciation• Along the margin of a major intrusive
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1km
Large Carlin-type mineral system
Widespread alteration, intense silicificationMulti-phase sulfide & oxide mineralizationEnriched Au and Carlin-type pathfinders
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1km
Camp-scalehydrogeochemistry
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Camp-scalehydrogeochemistry
219 boreholes194 SWL(static water level measurements)
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Camp-scalehydrogeochemistry
219 boreholes
Groundwater flow direction
194 SWL
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1km
Camp-scalehydrogeochemistry
219 boreholes194 SWL
Groundwater flow direction
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Camp-scalehydrogeochemistry
219 boreholes194 SWL425 groundwater samples
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1km
Camp-scalehydrogeochemistry
219 boreholes194 SWL425 samples
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1km
Camp-scalehydrogeochemistry
219 boreholes194 SWL425 samples
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1km
Camp-scalehydrogeochemistry
219 boreholes194 SWL425 samples
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1km
Camp-scalehydrogeochemistry
219 boreholes194 SWL425 samples
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First zone of enrichment
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Second zone of enrichment
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Intrusive margin
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IntenseSilicification
Intrusive margin
1km
Results of camp-scale program: direct geochemistry support to focus next-phase drilling to targets defined by favourable geologic settings + gold and pathfinders
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BlindSearch Space
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WHY HYDROGEOCHEMISTRY
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Exploration is a businessWe’re here to create value
CREATING VALUE SIZE OFTHE PRIZE
CHANCE OFSUCCESS
COST TOTEST>x
Provides opportunities to:
Improve chance of success(direct detection)
Lower cost to test(fewer + cheaper samples)
Find better deposits(new search spaces)
Adds value at multiple scales of application!
Regional to district scale
Target scale to focus the use of our most expensive tool: drilling
WHY HYDROGEOCHEMISTRY WHEN
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Thank you!