| Lat / long: | 43.73329, -103.61667 |
| Primary: | Beryllium, Feldspar, Mica |
| Tertiary: | Tantalum |
| Ore: | Beryl, Cleavelandite, Muscovite |
| Gangue: | Albite, Microcline, Quartz |
| Operation type: | Unknown |
| Production size: | Small |
| Development status: | Past Producer |
| First production started: | 1939 |
| Host type: | Mica Schist |
| Associated type: | Pegmatite |
| Tectonic: | Southern Black Hills |
| MRDS | D007184 |
| DEP | 10011970 |
| 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 MINEROLOGY OF SOME PEGMATITES NEAR CUSTER, SOUTH DAKOTA GEOLOGICAL SURVEY REPORT OF INVESTIGATIONS 50}{Deposit:: ROBERTS, W.L., AND RAPP, GEORGE, 1965, MINERALOGY OF THE BLACK HILLS, SOUTH DAKOTA SCHOOL OF MINES AND TECHNOLOGY BULLETIN 18.} |
| Reporter | Barari, Rachel A. |