| Previous record: 31 | Next record: 33 |
Minor podiform chromite deposit, 7 of 27 in Fresno county (in California)
Sections of this page: [Geologic] - [Economic] - [Reference]
| Country | United States |
|---|---|
| State or province | California |
| Geographic location: | 36°56'56"N,
119°24'53"W (-119.414722, 36.948889) |
| Geographic context: | (click for info) |
| Deposit type | minor podiform chromite |
| Model type | Minor Podiform |
| Deposit form | irregular, lenticular shaped masses |
| Deposit texture | massive, disseminated, stringers |
| Ore type | Metallurgical |
| Age of deposit | Lower Ordovician (483±21 Ma Sm-Nd whole rock and mineral) |
| Age (m.y.) | 483million years |
| Mineralogy | chromite magnesite |
| Host rock type | serpentinized dunite |
| Host rock length | 19000 |
| Host rock width | 13300 |
| Paleotectonic setting | midocean ridge |
| Ophiolite zone | tectonite |
| Deposits < 10km | podiform chromite |
| Rocks within 5km | serpentine harzburgite wehrlite pyroxenite dunite gabbro diorite schist metachert phyllite quartzite hornfels tactite slate marble amphibolite mica schist metarhyolite granitic intrusions alluvium |
| Geologic map unit | -119.414722222222, 36.9488888888889 |
| Nearby scientific data | Find additional scientific data near this location |
| Discovery date | 1917 | |
|---|---|---|
| Startup date | 1917 | |
| Tonnage | 0.003784 | million metric tons |
| Mine depth | 21 | m |
| Ore depth | 0 | m |
| Cr2O3 grade | 42 | percent |
| Comments | Total production 3,784 t @ 42% Cr2O3. Reserves are unknown at depth and laterally. Kings River ophiolite, Fresno County. |
|---|---|
| References | Matthews, R.A., and Burnett, J.L., 1965, Geologic map of California, Fresno sheet: California Division of Mines and Geology, scale 1:250,000. Rynearson, G.A., 1948, Chromite deposits of Tulare and eastern Fresno counties, California, in Geological investigations of chromite in California, Part 3--Sierra Nevada: California Division of Mines Bulletin 134, pt. 3, ch. 3, 104 p. Saleeby, J., 1978, Kings River ophiolite, southwest Sierra Nevada foothills, California: Geological Society of America Bulletin, v. 89, p. 617-636. Shaw, H.F., Chen, J.H., Saleeby, J.B., and Wasserburg, G.J., 1987, Nd-Sr-Pb systematics and age of the Kings River ophiolite, California--Implications for depleted mantle evolution: Contributions to Mineralogy and Petrology, v. 96, p. 281-290. |