Unnamed Occurrence (ARDF - MD002), McGrath District, Yukon-Koyukuk Borough, Alaska, USA
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Location: Occurrence is situated on a broad vegetated ridge at an elevation of 1,850 feet (564 m) in Section 29, T. 17 S., R. 30 E., of the Kateel River Meridian. Location is to within 1,000 feet (304 m).
Geology: Miller and others (1980) reported anomalous thorium and uranium from grab samples of porphyritic sanadine-rich rhyolite. Clautice and others (1993) report large sanadine crystals up to 2 cm in diameter, and abundant limonite staining. The occurrence is inferred to be Early Tertiary in age, based on isotopic ages of Sischu Volcanics (Moll and others, 1980). Miller and others (1980) report values of 24.1 ppm uranium and 117 ppm thorium from grab samples. Clautice and others (1993) report values of 115 ppm thorium, 29 ppm uranium, 230 ppm cerium, and elevated rare-earth-element values.
Workings: Miller and others (1980) report values of 24.1 ppm uranium and 117 ppm thorium from grab samples. Clautice and others (1993) report values of 115 ppm thorium, 29 ppm uranium, 230 ppm cerium, and elevated rare-earth-element values.
Age: Early Tertiary, based on isotopic ages of Sischu Volcanics (Moll and others, 1980).
Commodities (Major) - Th, U; (Minor) - Ce, REE
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.