South Dakota · Custer County
Past Producer

Ann Mine

Custer County, South Dakota, United States
Mica
⌖ Show on mapUSGS source ↗
Commodities
PrimaryMica
Commodity typeN
Deposit
Deposit sizeS
Orebody formIRREGULAR - 2 DIKES JOINED
Ore control2 Dikes Trending Nw
Materials
Ore mineralsMica
GangueMicrocline, Oligoclase, Quartz
Geology
Host rockQuartzite
Associated rockPegmatite
Tectonic settingSouthern Black Hills
Economic & production
Development statusPast Producer
Identification
Deposit ID10101682
MRDS IDD007188
Alternate namesGladys Wells Mine Gladys Nells Mine On the Map
RegionNA
Data scoreB
Coordinates43.65218, -103.55639
References
U.S. BUREAU OF MINES, 1955, BLACK HILLS MINERAL ATLAS, SOUTH DAKOTA: PART 2, BUREAU OF MINES INFORMATION CIRCULAR 7707U.S. BUREAU OF MINES, 1955, BLACK HILLS MINERAL ATLAS, SOUTH DAKOTA: PART 2, BUREAU OF MINES INFORMATION CIRCULAR 7707.