Montana · Lewis and Clark County
Past Producer
Valley Forge Mine
Lewis and Clark County, Montana, United States
Silver
Lead
Gold
Zinc
Copper
Arsenic
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USGS source ↗
Commodities
Primary
Silver, Lead, Gold
Secondary
Zinc, Copper
Tertiary
Arsenic
Commodity type
M
Deposit
Deposit size
S
Workings
Underground
Ore control
Lee Mountain-Valley Forge Shear Zone
Materials
Ore minerals
Chalcopyrite, Galena, Gold, Sphalerite
Gangue
Pyrite, Quartz, Tourmaline
Geology
Host rock
Quartz Monzonite
Associated rock
Quartz Monzonite · Butte Quartz Monzonite (Boulder Batholith)
Structure
Boulder Batholith, Lee Mountain-Valley Forge Shear Zone
Alteration
Sericitization
Economic & production
Development status
Past Producer
First production
1885
Identification
Deposit ID
10015839
MRDS ID
DB02093
Region
NA
Data score
B
Coordinates
46.49157, -112.24117
References
USGS BULL 527, P. 82-3.USGS BULL 842, P. 257-58.USGS PP 428, P. 55, PL. 1.USGS PP 428, P. 55; USGS BULL 842, P. 257.