Montana · Madison County
Past Producer
Keystone Mine
Madison County, Montana, United States
Gold
Silver
Copper
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USGS source ↗
Commodities
Primary
Gold, Silver
Secondary
Copper
Commodity type
M
Deposit
Deposit type
Contact Metasomatic
Deposit size
S
Materials
Ore minerals
Bornite, Chalcopyrite, Covellite, Gold, Silver
Gangue
Pyrite
Geology
Host rock
Gneiss · Pre Belt
Alteration
Serpentized Wallrock
Economic & production
Development status
Past Producer
Identification
Deposit ID
10013599
MRDS ID
D009990
Region
NA
Data score
C
Coordinates
45.69907, -112.31921
References
MIN RES OF US, 1910-13MBMG MEM 19, P. 34