Unnamed Occurrence (ARDF - MD001; in Sischu Creek valley), McGrath District, Yukon-Koyukuk Borough, Alaska, USA
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Geology: Quartz-rhyolite porphyry was found to contain anomalous thorium and uranium. Ore minerals were not identified (Miller and others, 1980; Clautice and others, 1993). Mineralization is inferred to be Early Tertiary, based on isotopic ages from Sischu Volcanic Field (Moll and others, 1980). Miller and others (1980) report up to 16.5 ppm uranium, and 70.4 ppm thorium from grab samples.
Workings: Miller and others (1980) report up to 16.5 ppm U, and 70.4 ppm Th from grab samples.
Age: Inferred to be Early Tertiary, based on isotopic ages from Sischu Volcanic Field (Moll and others, 1980).
Commodities (Major) - Th, U
Development Status: No
Deposit Model: Volcanogenic Uranium (Cox and Singer, 1986; model no. 25f)
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Clautice, K.H., Bowman, N.D., Clough, J.G., Gilbert, W.G., Kline, J.T., Smith, T.E., and Blodgett, R.B., 1993, Land selection Unit 8 (Kantishna River, Ruby, and Medfra quadrangles); References, lead isotope, geochemical and major oxide data: Alaska Division of Geological and Geophysical Surveys, 42 p., 1 sheet, scale 1:250,000. Miller, T.P., Moll, E.J., and Patton, W.W. Jr., 1980, Uranium and thorium rich volcanic rocks of the Sischu Creek area, Medfra quadrangle, Alaska: U.S. Geological Survey Open-File Report 80-803, 9 p.