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Critical and Strategic Minerals Investigations in Alaska: Chromium.

Authors
Foley-JY; Barker-JC; Brown-LL
Source
For Reference Only At Bureau Libraries :54 pages
Link
NIOSHTIC No.
10004693
Abstract
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.
Publication Date
19850101
Document Type
CP;
Fiscal Year
1985
NTIS Accession No.
NTIS Price
Identifying No.
OFR 97-85
Source Name
For Reference Only At Bureau Libraries
State
AK;
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