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Minor podiform chromite deposit, 16 of 20 in Siskiyou county (in California)
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| Other names | McGuffy Creek Group |
|---|---|
| Country | United States |
| State or province | California |
| Geographic location: | 41°42'59"N,
123°2'35"W (-123.043056, 41.716389) |
| Geographic context: | (click for info) |
| Deposit type | minor podiform chromite |
| Model type | Banded Podiform |
| Ore type | Unknown |
| Age of deposit | Triassic-Jurassic (225-180 Ma) |
| Age (m.y.) | 200million years |
| Area of deposit | 4.5sq m |
| Ore body length | 15m |
| Ore body width | 0.3m |
| Mineralogy | chromite |
| Host rock type | dunite |
| Host rock length | 16500 |
| Host rock width | 4300 |
| Paleotectonic setting | suprasubduction |
| Ophiolite zone | transition |
| Deposits < 10km | podiform chromite |
| Rocks within 5km | dunite lherzolite harzburgite websterite orthopyroxenite wehrlite hornblendite gabbro quartz diorite amphibolite greenschist graphitic schist blueschist argillite phyllite conglomerate breccia chert volcaniclastics |
| Geologic map unit | -123.043055555556, 41.7163888888889 |
| Nearby scientific data | Find additional scientific data near this location |
| Tonnage | 0.000181 | million metric tons |
|---|---|---|
| Ore depth | 0 | m |
| Cr2O3 grade | 23 | percent |
| Rh grade | 0.009 | g/t |
| Ir grade | 0.02 | g/t |
| Ru grade | 0.1 | g/t |
| Pd grade | 0.001 | g/t |
| Pt grade | 0 | g/t |
| Comments | Reported reserves 181 t (Cornwall, 1981). Analysis 0.02 ppm Ir, 0.1 ppm Ru, 0.009 ppm Rh, 0.001 ppm Pd, <0.01 ppm Pt. Siskiyou County. |
|---|---|
| References | 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., and Cater, F.W., Jr., 1950, Chromite deposits of Siskiyou County, California, in Geological investigations of chromite in California, Part 1--Klamath Mountains: California Division of Mines Bulletin 134, pt. 1, ch. 2, 127 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. Cornwall, H.R., 1981, Chromite deposits in the Seiad Valley and Scott Bar quadrangles, Siskiyou County, California: U.S. Geological Survey Bulletin 1382-D, 17 p. Wells, F.G., Smith, C.T., Rynearson, G.A., and Livermore, J.S., 1949, Chromite deposits near Seiad and McGuffy Creeks, Siskiyou County, California: U.S. Geological Survey Bulletin 948-B, p. 19-62. |