South Dakota · Custer County
Occurrence
Helen Group
Custer County, South Dakota, United States
Feldspar
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USGS source ↗
Commodities
Primary
Feldspar
Commodity type
N
Deposit
Deposit size
N
Workings
Surface
Orebody form
DIKES
Materials
Ore minerals
Feldspar
Gangue
Mica, Quartz, Tourmaline
Geology
Host rock
Pegmatite
Associated rock
Pegmatite
Tectonic setting
Southern Black Hills
Economic & production
Development status
Occurrence
Identification
Deposit ID
10055745
MRDS ID
SD02483
Alternate names
Helen No. 5, Helen Lode, Helen No. 1, Helen No. 2, Helen No. 3, Helen No. 4
Region
NA
Data score
C
Coordinates
43.71413, -103.61806
References
U.S. BUREAU OF MINES, 1955, BLACK HILLS MINERAL ATLAS, SOUTH DAKOTA: PART 2, BUREAU OF MINES INFORMATION CIRCULAR 7707