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Minor podiform chromite deposit, 9 of 13 in San Luis Obispo county (in California)
Sections of this page: [Geologic] - [Economic] - [Reference]
| Other names | Biaggini |
|---|---|
| Country | United States |
| State or province | California |
| Geographic location: | 35°24'14"N,
120°44'38"W (-120.743889, 35.403889) |
| Geographic context: | (click for info) |
| Deposit type | minor podiform chromite |
| Model type | Banded Podiform |
| Deposit form | irregular pods, stringers |
| Deposit texture | massive, disseminated |
| Ore type | Metallurgical |
| Age of deposit | Middle Jurassic (163.3±1.1 Ma, U-Pb apatite-feldspar isochron in gabbro) |
| Age (m.y.) | 163million years |
| Mineralogy | chromite |
| Host rock type | serpentinized dunite |
| Host rock length | 20000 |
| Host rock width | 4250 |
| Paleotectonic setting | suprasubduction |
| Ophiolite zone | transition |
| Deposits < 10km | podiform chromite |
| Rocks within 5km | serpentine dunite wehrlite harzburgite sandstone conglomerate shale schist basalt diabase |
| Geologic map unit | -120.743888888889, 35.4038888888889 |
| Nearby scientific data | Find additional scientific data near this location |
| Tonnage | 0.005414 | million metric tons |
|---|---|---|
| Ore depth | 0 | m |
| Cr2O3 grade | 39 | percent |
| Fe % | 13.81 | percent |
| Cr:Fe ratio | 2.55 |
| Comments | Production is incomplete. In 1943-1944, 414 t of ore averaging 39% Cr2O3 was produced. Reported production of 2,143 t of mostly concentrates prior to 1943 apparently includes production from other mines. Estimated 5,414 t total production. 37% chromite, 51.45% Cr2O3. San Luis Obispo County. |
|---|---|
| References | Choi, S.H., Shervais, J.W., and Mukasa, S.B., 2008, Supra-subduction and abyssal mantle peridotites of the Coast Range ophiolite, California: Contributions to Mineralogy and Petrology, v. 156, p. 551-576. Walker, G.W., and Griggs, A.B., 1953, Chromite deposits of the southern Coast Ranges of California, in Geological investigations of chromite in California, Part 2--Coast Ranges: California Division of Mines Bulletin 134, pt. 2, ch. 2, 88 p. Jennings, C.W., 1958, Geologic map of California, San Luis Obispo sheet: California Division of Mines and Geology, scale 1:250,000. Hopson, C.A., Mattinson, J.M., Pessagno, E.A., Jr., and Luyendyk, B.P., 2008, California Coast Range ophiolite--Composite Middle and Late Jurassic oceanic lithosphere: Geological Society of America Special Paper 438, p. 1-101. |