Uranium 3 (in Selawik Hills)

Prospect, Inactive

Commodities and mineralogy

Main commodities Th; U
Other commodities Nb; Y
Ore minerals unidentified nb-u-ti mineral; xenotime; zircon
Gangue minerals epidote; fluorite; goethite; limonite

Geographic location

Quadrangle map, 1:250,000-scale SE
Quadrangle map, 1:63,360-scale A-4
Latitude 66.132
Longitude -160.657
Nearby scientific data Find additional scientific data near this location
Location and accuracy This prospect is at an elevation of about 950 feet in the SE1/4 section 31, T. 9 N., R. 9 W., of the Kateel River Meridian. Barker (1985), figures 7, 8, location C, sample 23-R

Geologic setting

Geologic description

The country rock in the area of this prospect is the mid-Cretaceous Selawik Hills alkaline intrusive complex. The prospect is one of several areas of anomalous radioactivity within the complex. At this location, a zone of altered porphyritic hornblende syenite contains accessory to minor amounts of zircon, xenotime, sphene, epidote, fluorite, goethite and an unidentified red, waxy mineral. The zone is over 10 feet wide and 100 to 250 feet long. Rock sample 23R contained 734 ppm U3O8, 875 ppm Th, and 535 ppm Nb. Emission spectrographic analysis of a split of this sample indicates 0.01% La, 0.1% Nb, 0.005% Y, and 1.0% Zr. A diamond drill hole is located to the southwest of the sample site (Barker, 1985).
Geologic map unit (-160.659712124297, 66.131350636611)
Mineral deposit model Disseminated radioactive minerals in syenite.
Age of mineralization Cretaceous.
Alteration of deposit An unidentified red, waxy mineral is altered to goethite and limonite.

Production and reserves

Workings or exploration Shallow prospect pits and at least 2 drill holes are evidence of earlier exploration. The exploration apparently took place in the mid-1970s and may have been more extensive than is evident. No information is available on that exploration (Barker, 1985).
Indication of production None