| Lat / long: | 39.31047, -123.17529 |
| Tertiary: | Manganese, Silica |
| Other material: | Chert, Psilomelane, Pyrolusite |
| Discovery year: | 1912 |
| Operation type: | Surface-Underground |
| Development status: | Past Producer |
| First production started: | 1914 |
| MRDS | M045326 |
| MAS | 60450052 |
| DEP | 10285652 |
| Reference | {Deposit:: CDMG BULLETINS:152,1950, #125,1943, #76,1918}{Deposit:: USBM R.I.5579,1960}{Deposit:: USGS FILE,1917-18} |
| Reporter | Deino, Al |