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Minor podiform chromite deposit, 19 of 29 in El Dorado county (in California)

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

Geologic Information
CountryUnited States
State or provinceCalifornia
Geographic location:38°49'13"N, 120°53'13"W
(-120.886944, 38.820278)
Geographic context: (click for info)
Deposit typeminor podiform chromite
Model typeMinor Podiform
Deposit formlenses
Deposit texturemedium-grained disseminated
Ore typeUnknown
Age of depositpre-Early Devonian-Jurassic (388±17 Ma U-Pb zircon from felsic igneous rocks; 174 Ma K-Ar white mica from blueschists)
Age (m.y.)388million years
Host rock typeserpentine
Host rock length6400
Host rock width3500
Paleotectonic settingsuprasubduction
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-120.886944444444, 38.8202777777778
Nearby scientific dataFind additional scientific data near this location
Economic Information
Discovery date1916
Startup date1916
Tonnage0.000203million metric tons
Mine depth14m
Ore depth0m
Cr2O3 grade33percent
Reference information
CommentsReserves are probably small. Feather River Belt. El Dorado County.
Mayfield, J.D., and Day, H.W., 2000, Ultramafic rocks in the Feather River Belt, northern Sierra Nevada, California, in Brooks, E.R., and Dida, L.T., eds., Field guide to the geology and tectonics of the northern Sierra Nevada, National Association of Geoscience Teachers Far-Western Section Fall Conference 2000: California Division of Mines and Geology Special Publication 122, p. 1-15.
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.
Cater, F.W., Jr., Rynearson, G.A., and Dow, D.H., 1951, Chromite deposits of El Dorado County, California, in Geological investigations of chromite in California, Part 3--Sierra Nevada: California Division of Mines Bulletin 134, pt. 3, ch. 4, 167 p.
Ehrenberg, S.N., 1975, Feather River ultramafic body, northern Sierra Nevada, California: Geological Society of America Bulletin, v. 86, p. 1235-1243.
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