Commodities
PrimaryGold
Commodity typeM
Deposit
Deposit typeStream Placer
Model119: Placer Au-PGE
Orebody formIrregular, lens
Ore controlMechanical accumulation on irregular natural bedrock riffles and within river and stream channel lag gravels, bars, and point bar deposits. Depoits are often enriched downstream of eroded gold quartz veins in the bedrock channels. \n
Materials
Ore mineralsGold
GangueQuartz
Geology
Host rockSand and Gravel
StructureCalaveras-Shoofly thrust fault, Melones Fault zone
Tectonic settingMagmatic arc
AlterationNA
Economic & production
Development statusPast Producer
Discovery year1848
Identification
Deposit ID10310690
RegionNA
Data scoreB
Coordinates38.44251, -120.63129
References
Clark, W. B., 1970, Gold districts of California: California Divisions of Mines and Geology Bulletin 193, p. 126-127.Carlson, D.W., and Clark, W.B., 1954, Amador County, placer gold: California Journal of Mines and Geology, v. 50, pp. 197-200.Haley, C.S., 1923, Gold placers of California: California Mining Bureau Bulletin 92, pp. 146-147.Koschmann, A.H., and Bergendahl, M.H., 1968, Principal gold-producing districts in the United States: U.S. Geological Survey Professional Paper 610, p. 58Lindgren, W., 1911, Tertiary gravels of the Sierra Nevada: U.S. Geological Survey Prof. Paper 73, pp.195-213Zimmerman, J.E., 1983, The Geology and structural evolution of a portion of the Mother Lode Belt, Amador County, California: unpublished M.S. thesis, University of Arizona, 138 p.