Montana · Silver Bow County
Past Producer

East Grey Rock Mine

Silver Bow County, Montana, United States
CopperSilverZincArsenic
⌖ Show on mapUSGS source ↗
Commodities
PrimaryCopper
SecondarySilver, Zinc
TertiaryArsenic
Commodity typeM
Deposit
Deposit sizeS
WorkingsUnderground
Materials
Ore mineralsBornite, Chalcocite, Chalcopyrite, Covellite, Enargite, Sphalerite
GanguePyrite, Quartz
Geology
Host rockQuartz Monzonite
Associated rockQuartz Monzonite · Butte Quartz Monzonite (Boulder Batholith)
StructureBoulder Batholith
AlterationHydrothermal
Economic & production
Development statusPast Producer
Identification
Deposit ID10012442
MRDS IDD008077
RegionNA
Data scoreC
Coordinates46.0249, -112.52422
References
USGS PP 74, P. 181-82, 183-84, PL. X