| Lat / long: | 43.70274, -103.5775 |
| Primary: | Lithium, Beryllium, Mica |
| Secondary: | Niobium (Columbium), Tantalum |
| Ore: | Amblygonite, Beryl, Columbite, Mica, Spodumene, Tantalite |
| Gangue: | Albite, Apatite, Cassiterite, Cleavelandite, Lepidolite, Muscovite, Quartz, Tourmaline |
| Orebody form: | LENS |
| Discovery year: | 1900 |
| Operation type: | Unknown |
| Production size: | Small |
| Development status: | Past Producer |
| Associated rock: | Pegmatite |
| Associated type: | Pegmatite |
| Tectonic: | Black Hills |
| Alteration processes: | Limonite Veinlets, The Stain Is Carried With Depth. The Pegmatite Is Badly Altered. |
| MRDS | SD02303 |
| DEP | 10055687 |
| Reference | {Deposit:: U.S. BUREAU OF MINES, 1955, BLACK HILLS MINERAL ATLAS, SOUTH DAKOTA: PART 2, BUREAU OF MINES INFORMATION CIRCULAR 7707}{Deposit:: FISHER, D. J., 1945, PRELIMINARY REPORT ON THE MINERALOGY OF SOME PEGMATITES NEAR CUSTER, SOUTH DAKOTA GEOLOGICAL SURVEY REPORT OF INVESTIGATIONS 50.}{Deposit:: FISHER, D.J., 1942, PRELIMINARY REPORT ON SOME PEGMATITES OF THE CUSTER DISTRICT, SOUTH DAKOTA GEOLOGICAL SURVEY REPORT OF INVESTIGATIONS 44}{Deposit:: BIENIEWSKI, C.L., 1964, THE MINERAL INDUSTRY OF SOUTH DAKOTA IN 1962, SOUTH DAKOTA GEOLOGICAL SURVEY MINERALS REPORT 10} |
| Reporter | Barari, Rachel A. |