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Billings Glacier Molybdenum-copper Occurrence, Whittier, Alaska.
For Reference Only At Bureau Libraries :30 pages
A previously unreported occurrence of molybdenum and copper mineralization in a small granitic stock exposed at the toe of Billings Glacier, 5.5 miles northeast of Whittier, Alaska, was discovered and examined by the Bureau of Mines in July and August 1981. Molybdenite occurs as disseminated grains and crystalline clusters, up to 1 1/2 inches across, apparently associated with hydrothermally altered portions and also along fractures in the granitic pluton. Molybdenite also occurs as disseminated grains in spheroidally weathering granitic xenoliths found in the pluton near its eastern contact. Minor pyrite and minor amounts of chalcopyrite are disseminated throughout marginal portions of the pluton. A high- grade sample of the mineralized granite contained 2,000 ppm mo but other samples did not exceed 30 ppm. Copper did not exceed 90 ppm and generally was less than 50 ppm in samples of the stock analyzed.
For Reference Only At Bureau Libraries
Page last reviewed: September 2, 2020
Content source: National Institute for Occupational Safety and Health Education and Information Division