mining montana - eps.berkeley.edu
TRANSCRIPT
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Mining Montana
Brett Davidheiser
Stillwater Mining Company
East Boulder
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Platinum Group Metals (PGMs)
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Palladium = Clean Air
Stillwater produces 7% of world demand for Palladium
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Regional Setting of the Stillwater ComplexRegional Setting of the Stillwater Complex
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Beartooth Mountains Uplift: Sequence 1Beartooth Mountains Uplift: Sequence 1
Beartooth Mountains Uplift: Sequence 2Beartooth Mountains Uplift: Sequence 2
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Beartooth Mountains Uplift: Sequence 3Beartooth Mountains Uplift: Sequence 3
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Generalized Stratigraphic Column of the Stillwater Complex
Generalized Stratigraphic Column of the Stillwater Complex
J-M REEF MINERALOGY
• Major Minerals• Plagioclase Feldspar (Labradorite)
• Orthopyroxene (bronzite)
• Clinopyroxene (augite)
• Olivine (serpentinized with magnetite)
• Minor Minerals• Sulfides
• Chromite
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J-M REEF ROCK TYPES
• NORITE - plagioclase and bronzite l tcumulate
• GABBRONORITE - plagioclase, augite, and bronzite cumulate
• TROCTOLITE - plagioclase and olivine cumulatecumulate
• DUNITE - olivine cumulate
• ANORTHOSITE - plagioclase cumulate
J-M Reef
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Sulfide Minerals• Most abundant sulfide minerals:
P rrhotite Fe S– Pyrrhotite Fe(1-x)S – Chalcopyrite CuFeS2
– Pentlandite (Fe,Ni)9S8
• Pentlandite hosts about 80% of the palladium
• Pd/Pt ratio approx. 3:1 – Recovered byproducts include gold, rhodium,
silver, copper, and nickel
J-M Reef
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A Day in the Life of a Grade Control Geo
Grade Control• Face Mark-ups
– Ore zone
– Shape
– Location
• Sampling– Channel Samples
– Muck Samples
• Mapping/Documentation
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Ramp and Fill
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74-695+0W
6 month Pt/Pd Prices
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One Year Pt/Pd price
