South Dakota · Custer County
Past Producer
Old Missouri Prospect
Custer County, South Dakota, United States
Feldspar
Mica
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USGS source ↗
Commodities
Primary
Feldspar, Mica
Commodity type
N
Deposit
Deposit size
S
Workings
Surface
Orebody form
IRREGULAR BRANCHING
Materials
Ore minerals
Biotite, Muscovite
Gangue
Albite, Quartz, Tourmaline
Geology
Host rock
Pegmatite
Associated rock
Pegmatite
Structure
Fractures Filled With Pegmatite
Economic & production
Development status
Past Producer
First production
1942
Identification
Deposit ID
10012478
MRDS ID
D008124
Region
NA
Data score
B
Coordinates
43.66968, -103.64362
References
U.S. BUREAU OF MINES, 1955, BLACK HILLS MINERAL ATLAS, SOUTH DAKOTA: PART 2, BUREAU OF MINES INFORMATION CIRCULAR 7707.USGS PP 247, P. 173-174.USBM INFO CIRC 7707.