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Unnamed

Occurrence, Inactive

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Commodities and mineralogy

Main commodities Th; U
Other commodities Ce; REE

Geographic location

Quadrangle map, 1:250,000-scale MD
Quadrangle map, 1:63,360-scale D-1
Latitude 63.982
Longitude -153.036
Nearby scientific data Find additional scientific data near this location
Location and accuracy 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).

Geologic setting

Geologic description

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.
Geologic map unit (-153.038367000939, 63.9814376564992)
Mineral deposit model Volcanogenic uranium (Cox and Singer, 1986; model 25f).
Mineral deposit model number 25f
Age of mineralization Early Tertiary, based on isotopic ages of Sischu Volcanics (Moll and others, 1980).
Alteration of deposit Limonitic.

Production and reserves

Workings or exploration 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.
Indication of production None
Reserve estimates None.

Additional comments

See MD001.

References

MRDS Number A012438

References

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 & Geophysical Surveys Public Data File 93-8, 46 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.
Reporters Bundtzen, T.K. (Pacific Rim Geological Consulting)
Last report date 6/7/1998