Commodities
PrimaryGold
SecondarySilver
Commodity typeM
Deposit
Deposit typeHydrothermal vein
Model273: Low-sulfide Au-quartz vein
Orebody formTabular
Ore controlMineralization occurs as erratic shoots within mesothermal gold-bearing quartz deposited within fracture zones.
Materials
Ore mineralsGold, Pyrite, Galena
GangueQuartz, Calcite, Chalcopyrite, Sphalerite
Geology
Host rockGranodiorite,Diabase
StructureWolf Creek Fault Zone, Gillis Hill Fault, Melones Fault Zone
Tectonic settingMagmatic arc
AlterationAnkeritic, sericitic, and pyritic replacement of wall rocks adjacent to veins
Economic & production
Development statusPast Producer
Discovery year1850
Identification
Deposit ID10310620
RegionNA
Data scoreB
Coordinates39.21165, -121.07084
References
Clark, W.B., 1970, Gold districts of California: California Division of Mines and Geology Bulletin 191, p. 53.Johnston, W.G., Jr., 1940, The gold quartz veins of Grass Valley, California: U.S. Geological Survey Professional Paper 194, 101 p.Koschmann, A.H., and Bergendahl, M.H., 1968, Gold-producing districts of the United States: U.S. Geological Survey Professional Paper 610, 283 p.Lindgren, W., 1896a, Geologic atlas of the United States - Nevada City Special Folio: U.S. Geological Survey Folio 29.Lindgren, W., 1896b, Gold-quartz veins of Nevada City and Grass Valley: Seventeenth Annual Report of the U.S. Geological Survey, Part 2, p. 1-262MacBoyle, E.M., 1919, Mines and mineral resources of Nevada County: Sixteenth Annual Report of the State Mineralogist, California State Mining Bureau, p. 1-270.Additional information on the Gold Hill Mine is contained in File No. 339-7749 (CGS Mineral Resources Files, Sacramento)