| Lat / long: | 41.13878, -117.25235 |
| Primary: | Gold |
| Secondary: | Silver |
| Tertiary: | Mercury, Arsenic, Antimony, Tungsten, Thallium, Barium-Barite, Fluorine-Fluorite, Molybdenum, Nickel, Zinc, Cobalt, Lead |
| Gangue: | Barite, Bournonite, Chalcopyrite, Cinnabar, Copper, Covellite, Famatinite, Galena, Geocronite, Iron, Marcasite, Pyrite, Quartz, Realgar, Sphalerite, Stibnite |
| Orebody form: | TABULAR |
| Discovery year: | 1984 |
| Operation type: | Unknown |
| Production size: | Small |
| Development status: | Producer |
| Production years: | 1987 - PRESENT (12/91) |
| First production started: | 1987 |
| Host rock: | Comus Formation |
| Host type: | Argillite |
| Structure: | Two Orientations Of Extensional Faulting Are Recognized. The Dominant Trend Strikes N-S To N30w, Dips 40-65 East, And Mimics The Strike Of The Orebody. The Second Strikes N30-60e, Dips 50-65 Se, And Offsets Quaternary Alluvium. |
| Alteration processes: | Hypogene Decalcification, Leaching, Silicification, Kaolinization Are Spatially Associated With Ore. Supergene Weathering Of Pyrite To A Depth Of 200 Ft. Calcite Veining Common Only In Massive, Unmineralized Limestone. Jasperoids Formed Coeval With Au Deposition, But Botryoidal, Chalcedonic Silica Is Younger Than Au Deposition. |
| MRDS | RE00029 |
| DEP | 10055089 |
| Reference | FOSTER, J.M., AND KRETSCHMER, E.L., 1991, GEOLOGY OF THE MAG DEPOSIT, PINSON MINE, HUMBOLDT COUNTY, NEVADA, IN RAINES, G.L., ET AL, EDS., GEOLOGY AND ORE DEPOSITS OF THE GREAT BASIN, THE GEOLOGICAL SOCIETY OF NEVADA, RENO, P. 845-856 |
| Reporter | Phinisey, J. D. (Marcus, S.) |