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Minor podiform chromite deposit, 3 of 5 in Amador county (in California)

Sections of this page: [Geologic] - [Economic] - [Reference]

Geologic Information
CountryUnited States
State or provinceCalifornia
Geographic location:38°26'14"N, 120°54'29"W
(-120.908056, 38.437222)
Geographic context: (click for info)
Deposit typeminor podiform chromite
Model typeMinor Podiform
Ore typeUnknown
Age of depositPennsylvanian (311±3 m.y. 206Pb/238U)
Age (m.y.)311million years
Host rock typeserpentine
Host rock length52000
Host rock width2000
Ophiolite zonetectonite
Deposits < 10kmpodiform chromite
Rocks within 5kmserpentine
basalt flow
basalt tuff
andesite flow
andesite tuff
andesite breccia
rhyolite flow
rhyolite tuff
Geologic map unit-120.908055555556, 38.4372222222222
Nearby scientific dataFind additional scientific data near this location
Economic Information
Discovery date1916
Startup date1916
Tonnage1e-05million metric tons
Ore depth0m
Cr2O3 grade38percent
Reference information
CommentsBear Mountain ophiolitic melange. Amador County.
Cater, F.W., Jr., 1948, Chromite deposits of Calaveras and Amador counties, California, in Geological investigations of chromite in California, Part 3--Sierra Nevada: California Division of Mines Bulletin 134, pt. 3, ch. 2, 60 p.
Wagner, D.L., Jennings, C.W., Bedrossian, T.L., and Bortugno, E.J., 1981, Geologic map of the Sacramento quadrangle: California Division of Mines and Geology Regional Geologic Map Series Map no. 1A, scale 1:250,000.
Saleeby, J.B., 1982, Polygenetic ophiolite belt of the California Sierra Nevada--Geochronological and tectonostratigraphic development: Journal of Geophysical Research, v. 87, no. B3, p. 1803-1824.
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