Commodities
PrimaryGold
SecondaryPlatinum, Silver
TertiaryLead, Iron, Zinc, Copper, Indium
Commodity typeM
Deposit
Deposit typeStream placer?Hydrothermal vein
Model119: Placer Au-PGE273: Low-sulfide Au-quartz vein
Orebody formIrregular?tabular, lens
Ore controlMechanical accumulation on irregular bedrock riffles and within river and stream channel lag gravels, bars, and point bar deposits ? Ore shoots within mesothermal gold-bearing quartz veins.
Materials
Ore mineralsGold, Quartz, Magnetite, Ilmenite, Zircon, Pyrite, Amphibole, Epidote, Chlorite, Siderite
Geology
Host rockGravel,Slate,Schist · Shoo Fly Complex
StructureMelones Fault Zone, Gills Hill Fault, Foresthill Fault, Melones Fault Zone
Tectonic settingMagmatic arc - Narrow ocean basin
Economic & production
Development statusPast Producer
Discovery year1855
Identification
Deposit ID10310606
Alternate namesSunny South
RegionNA
Data scoreA
Coordinates39.14639, -120.71852
References
Browne, R.E., 1890, The ancient rivers of the Foresthill Divide: California State Mining Bureau Report 15, p. 435-465.Clark, W.B., 1970, Gold districts of California: California Division of Mines and Geology Bulletin 193, p. 42-43.Crawford, J.J., 1894, Golden River and Hidden Treasure mines: California State Mining Bureau Report 12, p. 208-210.Irelan, W., Jr., 1888, Placer County: California State Mining Bureau Report 8, p. 468-472.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. 150-159.Logan, C.A., 1936, Gold mines of Placer County, Hidden Treasure Mine: California State Mining Bureau Report 32, p. 65-66.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.Waring, C. A., 1919, Placer County, Damascus District and Placer County drift mines: California State Mining Bureau Report 15, p. 317 and 352-375.