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Green Ridge Claim

Minor podiform chromite deposit, 14 of 22 in Butte county (in California)

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

Geologic Information
Other namesDynamite Kid, Wells
CountryUnited States
State or provinceCalifornia
Geographic location:39°42'26"N, 121°32'3"W
(-121.534167, 39.707222)
Geographic context: (click for info)
Deposit typeminor podiform chromite
Model typeMinor Podiform
Deposit formlens, stringer
Ore typeUnknown
Age of depositUpper Triassic-Lower Jurassic or older (204±2 Ma U-Pb zircon on leucodiorite)
Age (m.y.)204million years
Area of deposit11.163sq m
Ore body length18.3m
Ore body width0.61m
Host rock typeserpentine
Host rock length700
Host rock width100
Paleotectonic settingsuprasubduction
Ophiolite zonetectonite
Deposits < 10kmpodiform chromite
Rocks within 5kmserpentine
andesite tuff breccia
andesite mudflow
andesite tuff
andesite breccia
Geologic map unit-121.534166666667, 39.7072222222222
Nearby scientific dataFind additional scientific data near this location
Economic Information
Discovery date1917
Tonnage9.5e-05million metric tons
Mine depth3m
Ore depth0m
Cr2O3 grade38percent
Rh grade0.006g/t
Ir grade0.03g/t
Ru grade0.11g/t
Pd grade0.002g/t
Pt grade0g/t
Reference information
CommentsSerpentine body 800 m long, 120 m wide. Analysis <0.01 ppm Pt. Fiddle Creek Complex between Western and Central belts. Butte 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.
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.
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.
Saleeby, J.B., Shaw, H.F., Niemeyer, S., Moores, E.M., and Edelman, S.H., 1989, U/Pb, Sm/Nd, and Rb/Sr geochronological and isotopic study of northern Sierra Nevada ophiolitic assemblages, California: Contributions to Mineralogy and Petrology, v. 102, p. 205-220.
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