| Lat / long: | 38.94241, -119.23015 |
| Primary: | Copper |
| Secondary: | Silver, Gold |
| Tertiary: | Gypsum-Anhydrite |
| Ore: | Chalcopyrite, Chrysocolla, Malachite, Pyrite |
| Gangue: | Calcite, Pyroxene |
| Orebody form: | ELLIPTICAL IN PLAN |
| Operation type: | Unknown |
| Deposit type: | Sedimentary |
| Production size: | Small |
| Development status: | Past Producer |
| First production started: | 1912 |
| Host rock: | Rhyolite To Dacite Volcanics;Qtz. Monzonite Porphyry |
| Host type: | Limestone |
| Associated rock: | Andesite To Dacite Tuff Breccia;Rhyolite Tuff, Siltstone, Limestone |
| Associated type: | Monzonite,Diorite |
| Structure: | Yerington Batholith |
| Tectonic: | Complex Basin And Range Faulting |
| Alteration processes: | Shallow Oxidation, Albitic, Sericitic, Propylitic Weak Potassic |
| MRDS | M035869 |
| DEP | 10111427 |
| Reference | {Deposit:: JOHNSON, A. T., 1907 , REPORT ON MCCONNELL GROUP YERINGTON DISTRICT, UNPUBL. RECORD, NEV. BUREAU OF MINES FILE.}{Deposit:: KNOPF, A., 1918 , GEOLOGY AND ORE DEPOSITS OF THE YERINGTON DISTRICT, NEV., USGS PROF. PAPER NO. 114 .}{Deposit:: EINAUDI, M. T., 1977 , PETROGENISIS OF COPPER BEARING SKARN AT THE MASON VALLEY MINE, YERINGTON DIST., NEV., ECON. GEOL., VOL. 72 , NO. 5 .} |
| Reporter | Fiebelkorn, J. B. (Stewart, J. H.) |