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Mountain View

Minor podiform chromite deposit, 10 of 30 in Placer county (in California)

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

Geologic Information
Other namesManzanita Chrome
CountryUnited States
State or provinceCalifornia
Geographic location:39°2'15"N, 120°46'21"W
(-120.7725, 39.0375)
Geographic context: (click for info)
Deposit typeminor podiform chromite
Model typeMinor Podiform
Deposit formsmall bodies, narrow stringers, float
Ore typeMetallurgical
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 typedunite
Host rock length134000
Host rock width7000
Paleotectonic settingsuprasubduction
Ophiolite zonetectonite
Deposits < 10kmpodiform chromite
Rocks within 5kmdunite
mudflow breccia
rhyolite tuff
Geologic map unit-120.7725, 39.0375
Nearby scientific dataFind additional scientific data near this location
Economic Information
Discovery date<1918
Startup date1918
Tonnage0.000126million metric tons
Ore depth0m
Cr2O3 grade47.8percent
Reference information
CommentsResidual float ore remains, probably amounting to a few tonnes. Feather River Belt. Placer County.
Burnett, J.L., and Jennings, C.W., 1962, Geologic map of California, Chico sheet: California Division of Mines and Geology, scale 1:250,000.
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.
Rynearson, G.A., 1951, Chromite deposits in the northern Sierra Nevada, California (Placer, Nevada, Sierra, Yuba, Butte, and Plumas counties), in Geological investigations of chromite in California, Part 3--Sierra Nevada: California Division of Mines Bulletin 134, pt. 3, ch. 5, 321 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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