Mine detail: Alpha - Omega Mines

Previously called ''

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Location

Lat / long: 39.33669, -120.75893

Resource(M)

Primary: Gold
Secondary: Platinum, Silver
Ore: Gold, Quartz, Magnetite, Ilmenite, Zircon, Pyrite, Amphibole, Epidote, Chlorite, Siderite
Orebody form: Irregular
Discovery year: 1850

Production

Operation type: Surface
Deposit type: Stream placer
Development status: Past Producer

Geology

Host type:Sand and Gravel
Structure:Melones Fault Zone, Melones Fault Zone, Foresthill Fault
Tectonic:Magmatic arc

References

DEP10310582
Reference{Deposit:: Clark, L. D., 1960, Foothills fault system, western Sierra Nevada, California: Geological Society of America Bulletin, v. 71, p. 483-496.}{Deposit:: Clark, W.B., 1966, Gold, in Mineral resources of California: California Division of Mines and Geology Bulletin 191, p. 179-185.}{Deposit:: Clark, W.B., 1970, Gold districts of California: California Division of Mines and Geology Bulletin 193, p. 128.}{Deposit:: Jarman, A, 1927, Omega Mine: California State Mining Bureau Report 23, p. 112-113.}{Deposit:: Lindgren, W., 1900, Colfax folio: U.S. Geological Survey Atlas of the U.S., Folio 66, 10 p.}{Deposit:: Lindgren, W., 1911, Tertiary gravels of the Sierra Nevada: U.S. Geological Survey Professional Paper 73, p. 139-141.}{Deposit:: MacBoyle, E., 1919, Nevada County, Washington Mining District: California State Mining Bureau Report 16, p. 59-63.}{Deposit:: Saucedo, G. J. and Wagner, D. L., 1992, Geologic map of the Chico Quadrangle: California Division of Mines and Geology Regional Map Series Map No. 7A, scale 1:250,000.}{Deposit:: Yeend, W.E., 1974, Gold-bearing gravel of the ancestral Yuba River, Sierra Nevada, California: U.S. Geological Survey Professional Paper 772, 44 p.}{Deposit:: Additional information on the Alpha-Omega mines is contained in File No. 339-5934 (CGS Mineral Resources Files, Sacramento).}
ReporterDowney, Cameron (Higgins, Chris, T.), Schruben, Paul G.