South Dakota · Custer County
Occurrence
Custer Mica Lodes Nos. 1 and 2
Custer County, South Dakota, United States
Mica
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USGS source ↗
Commodities
Primary
Mica
Commodity type
N
Deposit
Deposit size
N
Workings
Surface/Underground
Materials
Ore minerals
Muscovite
Gangue
Albite, Quartz
Geology
Host rock
Pegmatite
Associated rock
Pegmatite
Tectonic setting
Southern Black Hills
Alteration
Slightly Air-Stained
Economic & production
Development status
Occurrence
Discovery year
1943
Identification
Deposit ID
10011974
MRDS ID
D007190
Region
NA
Data score
C
Coordinates
43.49052, -103.57417
References
U.S. BUREAU OF MINES, 1955, BLACK HILLS MINERAL ATLAS, SOUTH DAKOTA: PART 2, BUREAU OF MINES INFORMATION CIRCULAR 7707