| Lat / long: | 37.79129, -122.17521 |
| Primary: | Copper |
| Secondary: | Gold |
| Tertiary: | Zinc |
| Ore: | Bornite, Chalcanthite, Chalcocite, Chalcopyrite, Copper, Epsomite, Hematite, Limonite, Pyrite, Sphalerite |
| Orebody form: | LENTICULAR |
| Discovery year: | 1891 |
| Operation type: | Unknown |
| Production size: | Small |
| Development status: | Past Producer |
| Production years: | 1925 - 1929 |
| Host rock: | Leona Rhyolite |
| Host type: | Rhyolite |
| Structure: | Hayward Fault: Two Parallel Smaller Faults With Horizontal Displacement. |
| MRDS | M004762 |
| DEP | 10102589 |
| Reference | {Deposit:: CLARK, C.W., 1917 : GEOLOGY AND ORE DEPOSITS OF LEONA RHYOLITE: UNIV. CALIF. PUB., BULL. OF DEPT. GEOLOGY, VOL. 10 , NO. 20 , PP 361 - 382}{Deposit:: DAVIS, F.F., 1950 ; MINES AND MINERAL RESOURCES ALAMEDA COUNTY; CALIF. JOUR. MINES AND GEOLOGY, VOL. 46 , NO. 2 ; DIV. OF MINES, P. 305 - 307}{Deposit:: LAIZURE, C.V., 1929 ; SAN FRANCISCO FIELD DIV.; 25TH REPT. STATE MIN.; CALIF. DIV. OF MINES, P. 440 - 441}{Production:: ERIC, J.H., 1948} |
| Reporter | Gere, W., Fraticelli, L. A. (Albers, J.) |