| Lat / long: | 37.55381, -121.62523 |
| Tertiary: | Manganese, Silica |
| Other material: | Chert, Jasper, Psilomelane, Pyrolusite, Quartz |
| Discovery year: | 1880 |
| Operation type: | Unknown |
| Development status: | Producer |
| First production started: | 1880 |
| MRDS | M004681 |
| MAS | 60010022 |
| DEP | 10284354 |
| Reference | DOM BULL 125 P101, BULL 152 P25,BULL 140 P66 PL1., CJMG VOL |
| Reporter | Deino, Al |