| Lat / long: | 37.64321, -121.50042 |
| Tertiary: | Manganese, Silica |
| Other material: | Chert, Psilomelane |
| Discovery year: | 1914 |
| Operation type: | Underground |
| Development status: | Past Producer |
| First production started: | 1915 |
| MRDS | M020146 |
| MAS | 60770005 |
| DEP | 10116352 |
| Reference | {Deposit:: C.D.M.G. BULL. 152, PP. 226-7 PLATE 10,1950}{Deposit:: U.S. BUREAU OF MINES RI 4580, 1949; NW. OF THE LADD MINE.} |
| Reporter | Burnett |