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Placer Gold Deposits of the Eagle Trough, Upper Yukon River Region, Alaska.
BoM, 1986 :23 pages
Gold placer deposits along the upper Yukon River, in the region between the river villages of Circle and Eagle, were investigated by the Bureau of Mines. The investigation was conducted intermittently between 1976 and 1985 as part of an evaluation of mineral resources on lands proposed for inclusion in the National Park System. At least 230,000 troy ounces of gold has been produced in the region, principally from Woodchopper, Coal, and Fourth of July Creeks. The placers are underlain by, or occur downstream of, Early Tertiary sediments that have been deposited in the Eagle Trough. Strike-slip displacement along the Tintina fault is responsible for creation of the trough and may have been a factor in the formation of the present placers. Placers were found to have a close spatial correlation to certain altered fault lineaments of the tintina fault trench. Placer concentrates contain several different textural forms of gold, suggesting multiple origins. Geological studies and a survey of 162 panned concentrates throughout the region indicated previously unreported sites of placer gold, and potential exists for the discovery of additional placer and lode gold. Because of nearly continuous soil and vegetation cover, further evaluation of the region will require subsurface sampling.
Mineral-deposits; Placer-mining; Mineral-industries;
IH; Information Circular;
NTIS Accession No.
Bureau of Mines, Fairbanks, Alaska. Alaska Field Operations Center.
Page last reviewed: April 12, 2019
Content source: National Institute for Occupational Safety and Health Education and Information Division