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Minor podiform chromite deposit, 5 of 37 in Del Norte county (in California)

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

Geologic Information
CountryUnited States
State or provinceCalifornia
Geographic location:41°55'57"N, 123°56'43"W
(-123.945278, 41.9325)
Geographic context: (click for info)
Deposit typeminor podiform chromite
Model typeMinor Podiform
Deposit formbunches, lumps, stringers
Deposit texturemassive, disseminated
Ore typeMetallurgical
Age of depositMiddle Jurassic (162-164 Ma)
Age (m.y.)163million years
Area of deposit163.8sq m
Ore body length91m
Ore body width1.8m
Host rock typeserpentine, dunite
Host rock length110000
Host rock width24000
Paleotectonic settingsuprasubduction
Ophiolite zonetectonite
Deposits < 10kmpodiform chromite, silica-carbonate Hg, lateritic Ni-Co, placer gold, mafic volcanogenic massive sulfide
Rocks within 5kmserpentine
hornblende diorite
Geologic map unit-123.945277777778, 41.9325
Nearby scientific dataFind additional scientific data near this location
Economic Information
Discovery date1941
Startup date1942
Tonnage0.000139million metric tons
Mine depth15m
Ore depth0m
Cr2O3 grade50.5percent
Rh grade0.018g/t
Ir grade0.14g/t
Ru grade0.33g/t
Pd grade0g/t
Pt grade0.015g/t
Cr:Fe ratio2.82
Reference information
CommentsAnalysis 0.14 ppm Ir, 0.33 ppm Ru, 0.018 ppm Rh, <0.004 ppm Pd, 0.015 ppm Pt. Del Norte County.
Wagner, D.L., and Saucedo, G.J., 1987, Geologic map of the Weed quadrangle, California: California Division of Mines and Geology Regional Geologic Map Series Map no. 4A, scale 1:250,000.
Wells, F.G., Cater, F.W., Jr., and Rynearson, G.A., 1946, Chromite deposits of Del Norte County, California, in Geological investigations of chromite in California, Part 1--Klamath Mountains: California Division of Mines Bulletin 134, pt. 1, ch. 1, 76 p.
Albers, J.P., 1984, Geology and chromite in the Low Plateau area, Del Norte County, California: U.S. Geological Survey Bulletin 1546-A, p. 39-52.
Carlson, C.A., Wilson, S.A., Carlson, R.R., Bradley, L., Cornell, J., Gent, C., Gass, W., Groeneboer, H., Haffty, J., Haubert, A., Love, A., McDade, J.M., Moore, R., Riley, L., Moring, B.C., Singer, D.A., and Page, N. J, 1985, Analyses for platinum group elements in samples from podiform chromite deposits, California and Oregon: U.S. Geological Survey Open-File Report 85-442, 15 p.
Cater, F.W., Jr., and Wells, F.G., 1953, Geology and mineral resources of the Gasquet Quadrangle, California-Oregon: U.S. Geological Survey Bulletin 995-C, 133 p.
Evans, J.G., 1984, Structure of part of the Josephine Peridotite, northwestern California and southwestern Oregon: U.S. Geological Survey Bulletin 1546-A, p. 7-37.
Harper, G.D., Saleeby, J.B., and Heizler, M., 1994, Formation and emplacement of the Josephine ophiolite and the Nevadan orogeny in the Klamath Mountains, California-Oregon--U/Pb zircon and 40Ar/39Ar geochronology: Journal of Geophysical Research, v. 99, B3, p. 4293-4321.
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