Mine detail: Omaha - Lone Jack Mines

Previously called ''

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Location

Lat / long: 39.19339, -121.06594

Resource(M)

Primary: Gold
Secondary: Silver
Ore: Gold, Pyrite, Galena
Gangue: Quartz, Calcite, Chalcopyrite, Sphalerite
Orebody form: Tabular
Discovery year: 1855

Production

Operation type: Underground
Deposit type: Hydrothermal vein
Development status: Past Producer

Geology

Host type:Granodiorite,Diabase
Structure:Wolf Creek Fault Zone, Gillis Hill Fault, Melones Fault Zone
Tectonic:Magmatic arc
Alteration processes:Ankeritic, sericitic, and pyritic replacement of wall rocks adjacent to veins

References

DEP10310658
Reference{Deposit:: Clark, W.B., 1970, Gold districts of California: California Division of Mines and Geology Bulletin 191, p. 53.}{Deposit:: Johnston, W.G., Jr., 1940, The gold quartz veins of Grass Valley, California: U.S. Geological Survey Professional Paper 194, 101 p.}{Deposit:: Koschmann, A.H., and Bergendahl, M.H., 1968, Gold-producing districts of the United States: U.S. Geological Survey Professional Paper 610, 283 p.}{Deposit:: Lindgren, W., 1896a, Geologic atlas of the United States - Nevada City Special Folio: U.S. Geological Survey Folio 29.}{Deposit:: Lindgren, W., 1896b, Gold-quartz veins of Nevada City and Grass Valley: Seventeenth Annual Report of the U.S. Geological Survey, Part 2, p. 1-262}{Deposit:: MacBoyle, E.M., 1919, Mines and mineral resources of Nevada County: Sixteenth Annual Report of the State Mineralogist, California State Mining Bureau, p. 1-270.}
ReporterDowney, Cameron, Schruben, Paul G.