| Lat / long: | 38.23019, -120.87491 |
| Primary: | Copper, Zinc |
| Secondary: | Gold, Lead, Silver |
| Ore: | Bornite, Chalcocite, Chalcopyrite, Chrysocolla, Copper, Covellite, Galena, Gold, Malachite, Pyrite, Sphalerite, Tetrahedrite |
| Gangue: | Barite, Calcite, Chlorite, Quartz, Selenite, Sericite |
| Orebody form: | LENTICULAR |
| Discovery year: | 1861 |
| Operation type: | Unknown |
| Deposit type: | Replacement |
| Production size: | Medium |
| Development status: | Past Producer |
| Production years: | 1861-1867, 1883-1896, 1899-1919, 1926, 1928, 1937, 1943-1946, 1948-1953, 1955-1956, 1958-1959 |
| First production started: | 1861 |
| Last production ended: | 1959 |
| Host rock: | Amador Group |
| Host type: | Greenstone,Schist |
| Structure: | Faults; 3 Categories 1. Generally Steeply Dipping Faults, Strike Ne, Little Effect On Ore Body 2. Low-Angle Reverse Faults, N 30 W - N 30 E, 25 - 55 E 3. High-Angle, Along Certain Schistosity Planes Or At Contacts. Folds Plunge From 60 S - 85 N, Schistosity And Cleavage In Most Rocks - Schistosity Parallel To Bedding Dips Eastward 5 - 15 Degrees. |
| Tectonic: | Island Arc |
| Alteration processes: | Zones Of Sericitization, Silicification And Pyritization As Belts And Lenses In Metavolcanic And Intrusive Rocks. |
| MRDS | M020443 |
| DEP | 10033797 |
| Reference | {Deposit:: CLARK, W. B., AND LYDON, P. A., 1962 , MINES AND MINERAL RESOURCES OF CALAVERAS COUNTY, CALIFORNIA; COUNTY REPT. 2 ; CALIF. DIV. MINES AND GEOLOGY, P. 28 - 31}{Deposit:: HEYL, G. R., COX, M. W. AND ERIC, J. H., 1948 , PENN ZINC-COPPER MINE, CALAVERAS COUNTY, CALIFORNIA; COPPER IN CALIFORNIA BULL. 144 ; DIV. OF MINES, P. 61 - 84}{Production:: CLARK, W. B. & LYDON, P. A., 1962 , (SEE REF.)} |
| Reporter | Fraticelli, L. A. (Albers, J.) |