Commodities
PrimaryGold
SecondaryPlatinum, Silver
Commodity typeM
Deposit
Deposit typeStream placer
Model119: Placer Au-PGE
Orebody formIrregular
Ore controlMechanical accumulation on irregular bedrock riffles and within river and stream channel lag gravels, bars, and point bar deposits
Materials
Ore mineralsGold, Magnetite, Ilmenite, Zircon, Pyrite, Amphibole, Epidote, Chlorite, Siderite
GangueQuartz
Geology
Host rockSand and Gravel
StructureBig Bend - Wolf Creek Fault Zone, Melones Fault Zone
Tectonic settingMagmatic arc
Economic & production
Development statusPast Producer
Discovery year1851
Identification
Deposit ID10310673
Alternate namesColumbia Hill Mine, Badger Hill Diggings
RegionNA
Data scoreB
Coordinates39.36239, -120.99354
References
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. 101.Hobson, J.B. and Wiltsee, E.A., 1893, Columbia Hill district: California State Mining Bureau Report 11, p. 305-308.Irelan, W., Jr., 1888, Columbia Hill district: California State Mining Bureau Report 8, p. 444-447.Lindgren, W., 1900, Colfax folio: U.S. Geological Survey Atlas of the U.S., Folio 66, 10 p.Lindgren, W., 1911, Tertiary gravels of the Sierra Nevada: U.S. Geological Survey Professional Paper 73, p. 139.MacBoyle, E., 1919, Nevada County, North Columbia mining district: California State Mining Bureau Report 16, p. 48-51.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.Yeend, W.E., 1974, Gold-bearing gravel of the ancestral Yuba River, Sierra Nevada, California: U.S. Geological Survey Professional Paper 772, 44 p.Additional information on San Juan Ridge is contained in File No. 331-9312 (CGS Mineral Resources Files, Sacramento)