| Lat / long: | 37.60411, -121.63353 |
| Tertiary: | Manganese, Silica |
| Other material: | Chert, Jasper, Psilomelane, Pyrolusite |
| Discovery year: | 1916 |
| Operation type: | Surface |
| Development status: | Past Producer |
| First production started: | 1917 |
| MRDS | M004660 |
| MAS | 60010021 |
| DEP | 10138710 |
| Reference | CDMG BULLETINS: #76,1918;#152,1950; #140,1948 |
| Reporter | Deino, Al |