| Lat / long: | 43.75246, -103.52806 |
| Primary: | Feldspar, Mica, Beryllium |
| Tertiary: | Lithium |
| Ore: | Albite, Beryl, Lithiophilite, Muscovite |
| Gangue: | Cleavelandite, Microcline, Quartz, Tourmaline, Triphylite |
| Orebody form: | DIKE |
| Operation type: | Unknown |
| Production size: | Small |
| Development status: | Past Producer |
| First production started: | 1937 |
| Host rock: | Quartz Sandstone And Graywacke |
| Host type: | Sandstone |
| Associated rock: | Pegmatite |
| Associated type: | Pegmatite |
| Alteration processes: | Albitization Has Been Prevasive |
| MRDS | SD02296 |
| DEP | 10055682 |
| Reference | {Deposit:: U.S. BUREAU OF MINES, 1954, BLACK HILLS MINERAL ATLAS, SOUTH DAKOTA: PART 1, BUREAU OF MINES INFORMATION CIRCULAR 7688}{Deposit:: FISHER, D.J., 1945, PRELIMINARY REPORT ON THE MINERALOGY OF SOME PEGMATITES NEAR CUSTER, SOUTH DAKOTA GEOLOGICAL SURVEY REPORT OF INVESTIGATIONS 50}{Production:: U.S. BUREAU OF MINES, 1955, BLACK HILLS MINERAL ATLAS, SOUTH DAKOTA: PART 2, BUREAU OF MINES INFORMATION CIRCULAR 7707} |
| Reporter | Barari, Rachel A. |