| Lat / long: | 40.20455, -123.70552 |
| Tertiary: | Manganese, Silica |
| Other material: | Chert, Hematite, Psilomelane, Quartz, Rhodochrosite |
| Discovery year: | 1917 |
| Operation type: | Surface-Underground |
| Development status: | Past Producer |
| First production started: | 1918 |
| MRDS | W017570 |
| MAS | 60230006 |
| DEP | 10212168 |
| Reference | {Deposit:: TRASK-GEO DESCRIPT MN DEPS OF CAL-CAL DIV OF MINES BUL 152-A}{Deposit:: TRENGOVE-RECON OF CAL MN DEPS-USBM RPT OF INVEST 5579-1960}{Deposit:: JENKINS-MN IN CALIF-CAL DIV OF MINES BUL 125-DEC 1943}{Deposit:: DAVIS & WOODFORD-UNPUB RPT CAL STATE COUNCIL FOR DEFENSE-191} |
| Reporter | Niemi |