Commodities
PrimaryLithium, Beryllium, Mica
SecondaryNiobium (Columbium), Tantalum
Commodity typeB
Deposit
Deposit sizeS
WorkingsSurface/Underground
Orebody formLENS
Materials
Ore mineralsAmblygonite, Beryl, Columbite, Mica, Spodumene, Tantalite
GangueAlbite, Apatite, Cassiterite, Cleavelandite, Lepidolite, Muscovite, Quartz, Tourmaline
Geology
Associated rockPegmatite · Pegmatite
Tectonic settingBlack Hills
AlterationLimonite Veinlets, The Stain Is Carried With Depth. The Pegmatite Is Badly Altered.
Economic & production
Development statusPast Producer
Discovery year1900
Identification
Deposit ID10055687
MRDS IDSD02303
RegionNA
Data scoreB
Coordinates43.70274, -103.5775
References
U.S. BUREAU OF MINES, 1955, BLACK HILLS MINERAL ATLAS, SOUTH DAKOTA: PART 2, BUREAU OF MINES INFORMATION CIRCULAR 7707FISHER, D. J., 1945, PRELIMINARY REPORT ON THE MINERALOGY OF SOME PEGMATITES NEAR CUSTER, SOUTH DAKOTA GEOLOGICAL SURVEY REPORT OF INVESTIGATIONS 50.FISHER, D.J., 1942, PRELIMINARY REPORT ON SOME PEGMATITES OF THE CUSTER DISTRICT, SOUTH DAKOTA GEOLOGICAL SURVEY REPORT OF INVESTIGATIONS 44BIENIEWSKI, C.L., 1964, THE MINERAL INDUSTRY OF SOUTH DAKOTA IN 1962, SOUTH DAKOTA GEOLOGICAL SURVEY MINERALS REPORT 10