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Minor podiform chromite deposit, 1 of 37 in Del Norte county (in California)
Sections of this page: [Geologic] - [Economic] - [Reference]
| Other names | Low Divide, Rowdy Creek |
|---|---|
| Country | United States |
| State or province | California |
| Geographic location: | 41°55'21"N,
124°2'5"W (-124.034722, 41.9225) |
| Geographic context: | (click for info) |
| Deposit type | minor podiform chromite |
| Model type | Minor Podiform |
| Deposit form | lenses, patches, stringers |
| Deposit texture | medium-grained massive to disseminated |
| Ore type | Metallurgical |
| Age of deposit | Middle Jurassic (162-164 Ma) |
| Age (m.y.) | 163million years |
| Area of deposit | 109.8sq m |
| Ore body length | 18.3m |
| Ore body width | 6m |
| Mineralogy | chromite magnesite aragonite serpentine |
| Host rock type | 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 | dunite harzburgite serpentine |
| Geologic map unit | -124.034722222222, 41.9225 |
| Nearby scientific data | Find additional scientific data near this location |
| Discovery date | 1886 | |
|---|---|---|
| Startup date | 1886 | |
| Tonnage | 0.0035 | million metric tons |
| Ore depth | 0 | m |
| Cr2O3 grade | 41 | percent |
| Cr:Fe ratio | 2.5 |
| Comments | Total production 3,165 t @ 41% Cr2O3. Reserves estimated at a few hundred tons (say 300 t). Dimensions in part based on glory hole. Del Norte County. |
|---|---|
| References | 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. 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. |