| Location: | Custer County, South Dakota, United States, North America |
| Lat / long: | 43.73329, -103.61667 |
| dep_id: | 10011970 |
| mrds_id: | D007184 |
| Commodity type: | metallic and nonmetallic |
| Major mineral: | Beryllium, Feldspar, Mica |
| Trace mineral: | Tantalum |
| Operation type: | Unknown |
| Production size: | Small ammount of material produced |
| Development status: | Past Producer |
| ore: | Beryl, Cleavelandite, Muscovite |
| gangue: | Albite, Microcline, Quartz |
| work_type: | Surface/Underground |
| conc_proc: | Hyperthermal Stage |
| Reporter: | Barari, Rachel A. |
| hrock_type: | Mica Schist |
| arock_type: | Pegmatite |
| tectonic: | Southern Black Hills |
| Year first produced: | 1939 |
| References: |
- 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.
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