Jefferson Creek Mine, Fortymile District, Southeast Fairbanks Borough, Alaska, USA
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Geology: Bedrock in Jefferson Creek consists of Paleozoic amphibolite-facies metamorphic rocks that have been intruded by plutons and dikes of Jurassic age (Foster, 1976; Szumigala and others, 2002). Placer workings are present near the mouth of the creek. Jefferson Creek was mined for placer gold in 1990 (Swainbank and others, 1991).
Workings: Jefferson Creek was mined for placer gold in 1990 (Swainbank and others, 1991).
Age: Quaternary.
Commodities (Major) - Au
Development Status: Yes
Deposit Model: Placer Au (Cox and Singer, 1986; model 39a).
Mineral List
1 entry listed. 1 valid mineral.
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References
Burleigh, R.E., and Lear, K.G., 1994, Compilation of data for Phase I of the mineral resource evaluation of the Bureau of Land Management Black River and Fortymile subunits: U.S. Bureau of Mines Open-File Report 48-94, 116 p. Foster, H.L., 1976, Geologic map of the Eagle quadrangle, Alaska: U.S. Geological Survey Miscellaneous Investigations Series, Map 922, 1 sheet, scale 1:250,000. Swainbank, R.C., Bundtzen, T.K., and Wood, J.E., 1991, Alaska's mineral industry, 1990: Alaska Division of Geological and Geophysical Surveys Special Report 45, 78 p. Szumigala, D.J., Newberry, R.J., Werdon, M.B., Athey, J.E., Flynn, R.L., and Clautice, K.C., 2002, Bedrock geologic map of the Eagle A-1 quadrangle, Fortymile mining district, Alaska: Alaska Division of Geological and Geophysical Surveys Preliminary Interpretive Report 2002-1b, 1 sheet, scale 1:63,360.