| Lat / long: | 37.60351, -121.65413 |
| Tertiary: | Manganese, Silica |
| Other material: | Chert, Glaucophane, Psilomelane, Pyrolusite, Rhodochrosite |
| Discovery year: | 1886 |
| Operation type: | Underground |
| Development status: | Past Producer |
| First production started: | 1888 |
| MRDS | M004659 |
| MAS | 60010005 |
| DEP | 10162994 |
| Reference | {Deposit:: CDMG,BULLETINS:152,1950,#76,1918,#125,1943 AND #140,1948}{Deposit:: USBM R.I 5579,1960} |
| Reporter | Deino, Al |