California · Nevada County
Past Producer

Zeibright Mine

Nevada County, California, United States
GoldCopper
⌖ Show on mapUSGS source ↗
Commodities
PrimaryGold
SecondaryCopper
Commodity typeM
Deposit
Deposit typeHydrothermal vein
Model273: Low-sulfide Au-quartz vein
Orebody formTabular
Ore controlOre shoots in quartz veins formed along fractures in the metamorphic country rock. The genetic relationship of the mineralization to the dike is not certain.
Materials
Ore mineralsGold, Pyrite, Chalcopyrite, Pyrrhotite
GangueQuartz
Geology
Host rockSlate,Volcanic Rock (Aphanitic) · Shoo Fly Complex
StructureMelones Fault Zone
Tectonic settingMagmatic arc
AlterationNone specifically reported, although there is a vague reference by MacBoyle (1919) to the slate wallrock being ?slightly changed at contact with the ledge.?
Economic & production
Development statusPast Producer
Discovery year1890
Identification
Deposit ID10310718
RegionNA
Data scoreB
Coordinates39.33139, -120.75417
References
Beard, J. S. and Day, H. W., 1987, The Smartville intrusive complex, Sierra Nevada, California: The core of a rifted volcanic arc: Geological Society of America Bulletin, v. 99, no. 6, p. 779-791.Brooks, E. R., 2000, Geology of a late Paleozoic island arc in the Northern Sierra terrane, in Brooks, E. R. and Dida, L.T., editors, Field guide to the geology and tectonics of the northern Sierra Nevada: California Division of Mines and Geology Special Publication 122, p. 53-110.Clark, L. D., 1960, Foothills fault system, western Sierra Nevada, California: Geological Society of America Bulletin, v. 71, p. 483-496.Clark, W.B., 1970, Gold districts of California: California Divisions of Mines and Geology Bulletin 193, p. 45-46.Day, H. W. and others, 1988, Metamorphism and tectonics of the northern Sierra Nevada, in Ernst, W. G., editor, Metamorphism and crustal evolution of the western United States (Rubey Volume VII): Prentice-Hall, Englewood Cliffs, New Jersey, p. 738-759.Harwood, D.S., 1988, Tectonism and metamorphism in the northern Sierra Terrane, northern California, in Ernst, W. G., editor, Metamorphism and crustal evolution of the western United States (Rubey Volume VII): Prentice-Hall, Englewood Cliffs, New Jersey, p. 764-788.Lindgren, W., 1900, Colfax folio, California: U.S. Geological Survey Atlas of the U.S., Folio 66, 10 p.Logan, C.A., 1941, Nevada County: 37th Annual Report of the State Mineralogist, California Journal of Mines and Geology, p. 431.MacBoyle, E., 1919, Nevada County: 16th Annual Report of the State Mineralogist, California State Mining Bureau, p. 260-261.Mining and Scientific Press, 1902, Placer County: Mining and Scientific Press, v. 85, no. 10, p. 135.Saucedo, G.J. and Wagner, D.L., 1992, Geologic map of the Chico Quadrangle, California: California Department of Conservation, Division of Mines and Geology Regional Geologic Map Series, Map No. 7A, scale 1:250,000.Schweickert, R.A., Hanson, R.E., and Girty, G.H., 1999, Accretionary tectonics of the Western Sierra Nevada Metamorphic Belt, in Wagner, D.L. and Graham, S.A., editors, Geologic field trips in northern California: California Division of Mines and Geology Special Publication 119, p. 33-79.