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Minor podiform chromite deposit, 1 of 1 in Okanogan county (in Washington)
Sections of this page: [Geologic] - [Economic] - [Reference]
| Discovery date | 1936 | |
|---|---|---|
| Startup date | 1955 | |
| Tonnage | 2.5e-05 | million metric tons |
| Ore depth | 0 | m |
| Cr2O3 grade | 42 | percent |
| Cr:Fe ratio | 2.9 |
| Comments | Produced 6 t. Total size 25 t (Lucas, 1975). Chopaka intrusion. Okanogan County. |
|---|---|
| References | Huntting, M.T., 1956, Inventory of Washington Minerals, Part 2, Metallic minerals: Washington Division of Mines and Geology Bulletin 37, p. 36-43. Lucas, J.M., 1975, The availability of nickel, chromium, and silver in Washington: Washington Division of Geology and Earth Resources Open-File Report OFR 75-14, 140 p. Moen, W.S., 1978, Mineral resource maps of Washington: Washington Division of Geology and Earth Resources Map GM-22, scale 1:1,000,000. Hibbard, M.J., 1971, Evolution of a plutonic complex, Okanogan Range, Washington: Geological Society of America Bulletin, v. 82, p. 3013-3048. Schuster, J.E., 2005, Geologic map of Washington State: Washington Division of Geology and Earth Resources Geologic Map GM-53, scale 1:500,000. |