South Dakota · Custer County
Occurrence
Knowles Lode Claim
Custer County, South Dakota, United States
Quartz
Mica
Beryllium
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USGS source ↗
Commodities
Primary
Quartz, Mica, Beryllium
Commodity type
B
Deposit
Deposit size
N
Workings
Surface
Orebody form
LENTICULAR
Materials
Ore minerals
Beryl, Muscovite, Quartz
Gangue
Biotite, Garnet, Plagioclase, Tourmaline
Geology
Host rock
Pegmatite
Associated rock
Pegmatite · Pegmatite
Economic & production
Development status
Occurrence
Identification
Deposit ID
10055673
MRDS ID
SD02284
Region
NA
Data score
B
Coordinates
43.78524, -103.59389
References
U. S. BUREAU OF MINES, 1955, BLACK HILLS MINERAL ATLAS, SOUTH DAKOTA: PART 2, BUREAU OF MINES INFORMATION CIRCULAR 7707