| Abstract: | The Emma Bell chromite deposit in Siskiyou County, California contains over 5 million tons of dunite averaging about 4 percent Cr2O3. Chromite is not evenly disseminated throughout the dunite, however. For the most part the deposit consists of many chromite-rich bands in sharp contact with, and separated by, common dunite containing 1 to 2 percent accessory chromite. Electron microprobe and petrographic analysis of accessory chromite shows that it is fine grained (average grain size 0.14 mm), generally lower in Cr2O3, and has a lower Cr/Fe ratio than segregated chromite. In addition, unusual patchy zoning is exhibited by some accessory chromite. These patchy zones are extremely rich in iron (>60 percent total iron oxide).
The negative factors such as the fine-grained nature of the accessory chromite and high iron content compared to segregated chromite, could be overcome by the very large tonnage in the deposit. |
| Genre: | USGS Numbered Series |
| ProdID: | 19847 |
| Citation Author: | Lipin, B. R.; Wetzel, Nicholas; Heinrich, S. M. |
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| Citation Language: | ENGLISH |
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| Citation Phsyical Description: | i, 16 p. :ill ;28 cm. |
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| Citation Publisher: | U.S. Geological Survey, |
| Citation Series: | Open-File Report |
| Citation Series Code: | OFR |
| Citation Series Number: | 83-816 |
| Citation Search Results Text: | The Emma Bell Deposit, Siskiyou Co., California : a possible low-grade source of chromite; 1983; OFR; 83-816; Lipin, B. R.; Wetzel, Nicholas; Heinrich, S. M. |
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| Citation Year: | 1983 |
| Type: | citation/reference |
| Text: | The Emma Bell Deposit, Siskiyou Co., California : a possible low-grade source of chromite; 1983; OFR; 83-816; Lipin, B. R.; Wetzel, Nicholas; Heinrich, S. M. |
| URL (THUMBNAIL): | http://pubs.usgs.gov/of/1983/0816/report-thumb.jpg |
| URL (DOCUMENT): | http://pubs.usgs.gov/of/1983/0816/report.pdf |
| Date Other: | Sat, 1 Jan 1994 00:00 -0600 |
| Publisher: | U.S. Geological Survey, |
