| Lat / long: | 39.80986, -123.02 |
| Tertiary: | Manganese |
| Discovery year: | 1917 |
| Operation type: | Surface-Underground |
| Development status: | Past Producer |
| MRDS | M010011 |
| MAS | 60450025 |
| DEP | 10212311 |
| Reference | CALIF JOUR MINES AND GEOL V49 NO4 OCT 1953 PP363 384 |
| Reporter | Western Field Operations Center (WFOC) |