California · Placer County
Past Producer

Herman Mine

Placer County, California, United States
GoldLead
⌖ Show on mapUSGS source ↗
Commodities
PrimaryGold
SecondaryLead
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.
Materials
Ore mineralsGold, Silver, Pyrite, Galena
GangueQuartz
Geology
Host rockSlate,Sandstone · Shoo Fly Complex
StructureMelones Fault Zone
Tectonic settingMagmatic arc
AlterationNone reported
Economic & production
Development statusPast Producer
Discovery year1894
Identification
Deposit ID10310705
Alternate namesOsborne
RegionNA
Data scoreB
Coordinates39.13444, -120.6375
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 Division of Mines and Geology Bulletin 193, p. 130.Crawford, J.J., 1894, Gold - Placer County: Twelfth Annual Report of the State Mineralogist, California State Mining Bureau, p. 211.Crawford, J.J., 1896, Placer County: Thirteenth Annual Report of the State Mineralogist, California State Mining Bureau, p. 280.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.Irelan, W., Jr., 1888, Placer County: Eighth Annual Report of the State Mineralogist, California State Mining Bureau, p. 472.Lindgren, W., 1900, Colfax folio, California: U.S. Geological Survey Atlas of the U.S., Folio 66, 10 p.Logan, C.A., 1936, Gold mines of Placer County: 32nd Annual Report of the State Mineralogist, California Journal of Mines and Geology, p. 26-27.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.Waring, C.A., 1915, Placer County: 15th Annual Report of the State Mineralogist, California State Mining Bureau, p. 341-342.