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Banded podiform chromite deposit, 1 of 6 in Trinity county (in California)
Sections of this page: [Geologic] - [Economic] - [Reference]
| Other names | Crow Creek Group, McConnell-Kirby, Chapman-Kirby |
|---|---|
| Country | United States |
| State or province | California |
| Geographic location: | 41°9'9"N,
122°31'20"W (-122.522222, 41.1525) |
| Geographic context: | (click for info) |
| Deposit type | banded podiform chromite |
| Model type | Banded Podiform |
| Deposit form | band |
| Deposit texture | massive, disseminated |
| Ore type | Unknown |
| Age of deposit | Ordovician |
| Age (m.y.) | 465million years |
| Area of deposit | 273sq m |
| Ore body length | 91m |
| Ore body width | 3m |
| Mineralogy | chromite uvarovite |
| Host rock type | dunite |
| Host rock length | 62500 |
| Host rock width | 57500 |
| Paleotectonic setting | suprasubduction |
| Ophiolite zone | tectonite |
| Deposits < 10km | podiform chromite |
| Rocks within 5km | dunite serpentine harzburgite plagioclase lherzolite gabbro pyroxenite diorite glacial outwash |
| Geologic map unit | -122.522222222222, 41.1525 |
| Nearby scientific data | Find additional scientific data near this location |
| Discovery date | <1943 | |
|---|---|---|
| Startup date | 1943 | |
| Tonnage | 0.002 | million metric tons |
| Mine depth | 5.4 | m |
| Ore depth | 0 | m |
| Cr2O3 grade | 41 | percent |
| Si2O2 % | 7 | percent |
| Comments | High Fe content. Trinity County. |
|---|---|
| References | Wells, F.G., and Hawkes, H.E., 1965, Chromite deposits of Shasta, Tehama, Trinity, and Humboldt counties, California, in Geological investigations of chromite in California, Part 1--Klamath Mountains: California Division of Mines Bulletin 134, pt. 1, ch. 3, 191 p. 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. O'Brien, J.C., 1965, Mines and mineral resources of Trinity County, California: California Division of Mines and Geology County Report 4, 125 p. Metcalf, R.V., Wallin, E.T., Willse, K.R., and Muller, E.R., 2000, Geology and geochemistry of the ophiolitic Trinity terrane, California--Evidence of middle Paleozoic depleted supra-subduction zone magmatism in a proto-arc setting, in Dilek, Y., Moores, E.M., Elthon, D., and Nicolas, A., eds., Ophiolites and oceanic crust--New insights from field studies and the Ocean Drilling Program: Geological Society of America Special Paper 349, p. 403-418. |