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Concentrations of Cobalt and Other Metals in the Western Crazy Mountains, Interior Alaska.

Authors
Barker-JC
Source
For Reference Only At Bureau Libraries :44 pages
Link
NIOSHTIC No.
10004269
Abstract
The U.S. Bureau of Mines made a reconnaissance in the Western Crazy Mountains for cobalt and associated metals as part of the Alaska- wide critical and strategic metals program. The area, located about 75 miles north of Fairbanks in central Alaska, is underlain by complexly faulted, predominantly clastic sedimentary rocks bordering the tintina fault system. Above background metal concentrations were found to occur in altered fault zones, tectonic breccias, soils, and ground water seeps and precipitates that either cut or are derived from the faulted clastic sedimentary rocks. Up to 0.115 pct cobalt and more than 2.0 pct zinc were detected in soil samples. Spring precipitates contained up to 1.3 pct zinc, 0.037 pct tungsten, and other metals. Some locations lacked cobalt but contained anomalous amounts of copper, lead, zinc, silver, and other metals. No outcropping of primary metallic minerals was located because of colluvium and vegetation cover and extensive deep leaching. Therefore, whether the metal values encountered are due to primary deposits with economic development potential or are the results of concentration by ground water from low-grade sources is unknown. The presence of cobalt, nickel, and zinc, and the identification of minor tin and tungsten indicate that further investigation is warranted.
Publication Date
19840101
Document Type
CP;
Fiscal Year
1984
NTIS Accession No.
NTIS Price
Identifying No.
OFR 213-84
NIOSH Division
AFOC;
Source Name
For Reference Only At Bureau Libraries
State
AK;
Performing Organization
Alaska Field Operations Center
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