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Minor podiform chromite deposit, 15 of 20 in Siskiyou county (in California)
Sections of this page: [Geologic] - [Economic] - [Reference]
| Other names | Octopus, McGuffy Creek Group |
|---|---|
| Country | United States |
| State or province | California |
| Geographic location: | 41°42'44"N,
123°2'51"W (-123.0475, 41.712222) |
| Geographic context: | (click for info) |
| Deposit type | minor podiform chromite |
| Model type | Banded Podiform |
| Deposit form | lenses, orbicular |
| Deposit texture | massive, disseminated |
| Ore type | Unknown |
| Age of deposit | Triassic-Jurassic (225-180 Ma) |
| Age (m.y.) | 200million years |
| Area of deposit | 387sq m |
| Ore body length | 43m |
| Ore body width | 9m |
| 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 | -123.0475, 41.7122222222222 |
| Nearby scientific data | Find additional scientific data near this location |
| Tonnage | 0.0014 | million metric tons |
|---|---|---|
| Ore depth | 0 | m |
| Cr2O3 grade | 35 | percent |
| Cr % | 37.08 | percent |
| Fe % | 20.52 | percent |
| Cr:Fe ratio | 1.81 |
| Comments | Mined 82 t, but not shipped. Reported reserves 340 t (Cornwall, 1981). Analysis 54.18% Cr2O3, 9.13% Cr2O3 (in ore), 17% chromite. 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. 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. Rynearson, G.A., and Smith, C.T., 1940, Chromite deposits in the Seiad Quadrangle, Siskiyou County, California: U.S. Geological Survey Bulletin 922-J, p. 281-306. 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. |