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Critical and Strategic Minerals Investigations in Alaska: Chromium.

Foley JY; Barker JC; Brown LL
For Reference Only At Bureau Libraries :54 pages
The Bureau of Mines investigated chromite deposits and occurrences in Alaska between 1979 and 1984 as part of the Bureau's Critical and Strategic Minerals Program. Beneficiation and mineralogical characterization tests were performed on 68 samples. Chromite- bearing Ultramafic rocks occur in eight regions in Alaska. An estimated 3,414,000 to 4,266,000 tons of chromite oxide (cr2o3) in high-chromium and high-iron chromite are contained in 132 subeconomic podiform-type deposits and 1 placer deposit. In most cases, minesite beneficiation would be required to produce shipping- grade concentrates. In the Chugach trend, an inferred reserve base is comrised of 2,800,000 tons of cr2o3 in 42 deposits that are all within 10 miles of tidewater or existing transportation routes. Most of these are indicated reserves (1,812,000 tons) contained in the newly discovered Turner stringer zone and Windy River placer deposit at Red Mountain and inferred reserves at the Halibut Bay complex on Kodiak Island. Between 576,000 and 1,394,000 tons of high-chromium chromite are contained in 70 less accessible deposits in the remote Western Brooks Range. The rampart, Yukon-Koyukuk, and Alaska Range trends and the southeast Alaska region contain deposits with minor production potential. Chromite also occurs in southwest Alaska and in the Yukon-Tanana uplands, but no significant deposits are known and no reserves were estimated.
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OFR 97-85
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For Reference Only At Bureau Libraries
Page last reviewed: November 12, 2021
Content source: National Institute for Occupational Safety and Health Education and Information Division