| Lat / long: | 43.71552, -103.66974 |
| Primary: | Feldspar |
| Secondary: | Mica, Beryllium, Lithium |
| Ore: | Amblygonite, Beryl, Biotite, Muscovite |
| Gangue: | Apatite, Cleavelandite, Purpurite, Quartz, Spodumene, Tourmaline, Vivianite |
| Orebody form: | CRESCENT-SHAPED DIKE |
| Discovery year: | 1880 |
| Operation type: | Unknown |
| Production size: | Small |
| Development status: | Past Producer |
| First production started: | 1880 |
| Host type: | Mica Schist |
| Associated type: | Pegmatite |
| Structure: | Black Hills Uplift, Ridge-Like Hill |
| MRDS | D008126 |
| DEP | 10101739 |
| Reference | {Deposit:: USBM INFO CIRC 7707, P. 149-150.}{Deposit:: USGS PP 247, P. 205-206.}{Deposit:: SDGS RI 44, P. 8-12.}{Deposit:: SDGS MR 10, P. 5.}{Deposit:: SDGS MR 11, P. 5.}{Deposit:: AM MIN VOL 54, P. 1312-1323.}{Production:: USGS PP 247, P. 206; SDGS MR 10, P. 5; SDGS MR 11, P. 5.} |
| Reporter | Barari, Rachel A. |