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Unnamed

Occurrence, Inactive

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Commodities and mineralogy

Main commodities Nb; Th; U
Other commodities Ce; REE; W

Geographic location

Quadrangle map, 1:250,000-scale MD
Quadrangle map, 1:63,360-scale D-1
Latitude 63.961
Longitude -153.176
Nearby scientific data Find additional scientific data near this location
Location and accuracy Occurrence is situated on an isolated knob one mile (1.6 km) south of Sischu Creek at an elevation of 2,000 feet (609 m) in Section 3, T. 18 S., R. 29 E., of the Kateel River Meridian. Location is accurate to within 100 feet (30 meters).

Geologic setting

Geologic description

Miller and others (1980) reported anomalous thorium and uranium from the Sischu Volcanics. Clautice and others (1993) noted extensive development of smoky quartz and large limonitically stained zones in outcrop. Inferred to be early Tertiary, based on isotopic ages from Sischu Volcanics (Moll and others, 1981).
Miller and others (1980) report values of 25.4 ppm uranium and 68.9 ppm thorium. Clautice and others (1993) reports values from six grab samples ranging from 27.0 to 73.2 ppm thorium 7.3 to 51.5 ppm uranium, 39 to 55 ppm niobium, up to 240 ppm cerium, and elevated tungsten and REE values.
Geologic map unit (-153.178367692348, 63.9604347828083)
Mineral deposit model Volcanogenic uranium (Cox and Singer, 1986; model 25f).
Mineral deposit model number 25f
Age of mineralization Inferred to be early Tertiary, based on isotopic ages from Sischu Volcanics (Moll and others, 1981).
Alteration of deposit Smoky quartz.

Production and reserves

Workings or exploration Miller and others (1980) report values of 25.4 ppm uranium and 68.9 ppm thorium. Clautice reports values from six grab samples ranging from 27.0 to 73.2 ppm thorium, 7.3 to 51.5 ppm uranium, 39 to 55 ppm niobium, up to 240 ppm cerium, and elevated tungsten and REE values.
Indication of production None
Reserve estimates None.

Additional comments

See MD001, MD002, and MD003.

References

MRDS Number A012440

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