| Previous record: 233 | Next record: 235 |
Minor podiform chromite deposit, 5 of 37 in Del Norte county (in California)
Sections of this page: [Geologic] - [Economic] - [Reference]
| Country | United States |
|---|---|
| State or province | California |
| Geographic location: | 41°55'57"N,
123°56'43"W (-123.945278, 41.9325) |
| Geographic context: | (click for info) |
| Deposit type | minor podiform chromite |
| Model type | Minor Podiform |
| Deposit form | bunches, lumps, stringers |
| Deposit texture | massive, disseminated |
| Ore type | Metallurgical |
| Age of deposit | Middle Jurassic (162-164 Ma) |
| Age (m.y.) | 163million years |
| Area of deposit | 163.8sq m |
| Ore body length | 91m |
| Ore body width | 1.8m |
| Mineralogy | chromite |
| Host rock type | serpentine, dunite |
| Host rock length | 110000 |
| Host rock width | 24000 |
| Paleotectonic setting | suprasubduction |
| Ophiolite zone | tectonite |
| Deposits < 10km | podiform chromite, silica-carbonate Hg, lateritic Ni-Co, placer gold, mafic volcanogenic massive sulfide |
| Rocks within 5km | serpentine dunite harzburgite hornblende diorite gravels |
| Geologic map unit | -123.945277777778, 41.9325 |
| Nearby scientific data | Find additional scientific data near this location |
| Discovery date | 1941 | |
|---|---|---|
| Startup date | 1942 | |
| Tonnage | 0.000139 | million metric tons |
| Mine depth | 15 | m |
| Ore depth | 0 | m |
| Cr2O3 grade | 50.5 | percent |
| Rh grade | 0.018 | g/t |
| Ir grade | 0.14 | g/t |
| Ru grade | 0.33 | g/t |
| Pd grade | 0 | g/t |
| Pt grade | 0.015 | g/t |
| Cr:Fe ratio | 2.82 |
| Comments | Analysis 0.14 ppm Ir, 0.33 ppm Ru, 0.018 ppm Rh, <0.004 ppm Pd, 0.015 ppm Pt. Del Norte 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., 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. |