Montana · Madison County
Past Producer
Big Chief Prospect
Madison County, Montana, United States
Mica
Beryllium
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USGS source ↗
Commodities
Primary
Mica
Tertiary
Beryllium
Commodity type
B
Deposit
Deposit size
S
Orebody form
PODS, PIPES
Materials
Gangue
Apatite, Biotite, Muscovite, Plagioclase, Quartz
Other materials
Beryl
Geology
Host rock
Schist · Cherry Creek
Structure
High Angle E And Ne Trending Faults
Economic & production
Development status
Past Producer
First production
1943
Last production
1944
Identification
Deposit ID
10013233
MRDS ID
D009420
Region
NA
Data score
C
Coordinates
45.51768, -112.11337
References
M.B.M.G. MEM. 28, 1949, P. 22-23