South Dakota · Custer County
Past Producer

Dorothy V Prospect

Custer County, South Dakota, United States
MicaBeryllium
⌖ Show on mapUSGS source ↗
Commodities
PrimaryMica
SecondaryBeryllium
Commodity typeB
Deposit
Deposit sizeS
WorkingsSurface
Ore controlSchist-Quartz Shoots
Materials
Ore mineralsBeryl, Biotite, Muscovite
GangueMicrocline, Plagioclase, Quartz, Tourmaline
Geology
Host rockSchist
Associated rockPegmatite
StructureSchist Inclusions, Associated With Quartz Masses, Cut The Pegmatite Diagonally
AlterationAir Stained
Economic & production
Development statusPast Producer
Identification
Deposit ID10055776
MRDS IDSD02526
RegionNA
Data scoreB
Coordinates43.75802, -103.6414
References
USBM INFO CIRC 7707, P. 118.USGS PP 247, P. 100.