South Dakota · Custer County
Occurrence
Mack Lode
Custer County, South Dakota, United States
Feldspar
Mica
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USGS source ↗
Commodities
Primary
Feldspar
Secondary
Mica
Commodity type
N
Deposit
Deposit size
N
Workings
Surface
Materials
Ore minerals
Feldspar, Mica
Gangue
Quartz, Tourmaline
Geology
Host rock
Schist,Pegmatite
Associated rock
Pegmatite
Economic & production
Development status
Occurrence
Identification
Deposit ID
10055797
MRDS ID
SD02553
Region
NA
Data score
C
Coordinates
43.64968, -103.61473
References
U.S. BUREAU OF MINES, 1955, BLACK HILLS MINERAL ATLAS, SOUTH DAKOTA: PART 2, BUREAU OF MINES INFORMATION CIRCULAR 7707, P. 163