The Emma Bell deposit, Siskiyou Co., California: A possible low-grade source of chromite
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- Document: Report (pdf)
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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.
Study Area
| Publication type | Report |
|---|---|
| Publication Subtype | USGS Numbered Series |
| Title | The Emma Bell deposit, Siskiyou Co., California: A possible low-grade source of chromite |
| Series title | Open-File Report |
| Series number | 83-816 |
| DOI | 10.3133/ofr83816 |
| Year Published | 1983 |
| Language | English |
| Publisher | U.S. Geological Survey |
| Contributing office(s) | Eastern Mineral and Environmental Resources Science Center |
| Description | i, 16 p. |
| Country | United States |
| State | California |
| County | Siskiyou County |
| Other Geospatial | Emma Bell deposit |
| Google Analytic Metrics | Metrics page |