| Lat / long: | 43.76635, -103.67863 |
| Primary: | Beryllium, Mica, Feldspar |
| Secondary: | Tantalum |
| Tertiary: | Lithium |
| Ore: | Albite, Beryl, Lithiophilite, Microcline, Muscovite |
| Gangue: | Apatite, Cassiterite, Garnet, Pyrite, Pyrrhotite, Quartz, Tourmaline, Uraninite, Uranophane, Vivianite, Zircon |
| Orebody form: | ELLIPTICAL |
| Operation type: | Unknown |
| Production size: | Small |
| Development status: | Past Producer |
| First production started: | 1907 |
| Host rock: | Quartz Two-Mica Schist |
| Host type: | Mica Schist |
| Associated rock: | Pegmatite |
| Associated type: | Pegmatite |
| MRDS | SD02328 |
| DEP | 10055707 |
| 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 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. |