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Minor podiform chromite deposit, 12 of 15 in Curry county (in Oregon)
Sections of this page: [Geologic] - [Economic] - [Reference]
| Country | United States |
|---|---|
| State or province | Oregon |
| Geographic location: | 42°16'40"N,
123°50'10"W (-123.836111, 42.277778) |
| Geographic context: | (click for info) |
| Deposit type | minor podiform chromite |
| Model type | Minor Podiform |
| Deposit form | banded zone, lenses |
| Deposit texture | disseminated, massive |
| Ore type | Metallurgical |
| Age of deposit | Middle Jurassic (164-162 Ma) |
| Age (m.y.) | 163million years |
| Area of deposit | 225.7sq m |
| Ore body length | 61m |
| Ore body width | 3.7m |
| Mineralogy | chromite |
| Host rock type | dunite |
| Host rock length | 18000 |
| Host rock width | 6300 |
| Paleotectonic setting | suprasubduction |
| Ophiolite zone | tectonite |
| Deposits < 10km | podiform chromite, low-sulfide gold veins, placer gold, mafic volcanogenic massive sulfide, magmatic magnetite in pyroxenite |
| Rocks within 5km | dunite serpentine harzburgite pyroxenite granodiorite hornblende diorite amphibolite gabbro metavolcanic rocks amphibole gneiss schist |
| Geologic map unit | -123.836111111111, 42.2777777777778 |
| Nearby scientific data | Find additional scientific data near this location |
| Discovery date | 1950s | |
|---|---|---|
| Startup date | 1950s | |
| Tonnage | 0.003 | million metric tons |
| Ore depth | 0 | m |
| Cr2O3 grade | 25 | percent |
| Cr:Fe ratio | 2.5 |
| Comments | Banded zone is 1.5-3.7 m thick. 1953-1956, production estimated at 3,000 t of ore with about 25% Cr2O5 to produce concentrates of 1219 t with 50% Cr2O3, 2.5 Cr:Fe. Curry County. |
|---|---|
| References | Ramp, Len, 1961, Chromite in southwestern Oregon: Oregon Department of Geology and Mineral Industries Bulletin 52, 169 p. Ramp, Len, 1975, Geology and mineral resources of the Upper Chetco drainage area, Oregon: Oregon Department of Geology and Mineral Industries Bulletin 88, 47 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. |