Uranium 3 (in Selawik Hills)

Prospect in Alaska, United States with commodities Thorium, Uranium, Niobium (Columbium), Yttrium

Geologic information

Identification information

Deposit ID 10002561
MRDS ID A013504
Record type Site
Current site name Uranium 3 (in Selawik Hills)

Geographic coordinates

Geographic coordinates: -160.66034, 66.13137 (WGS84)
Relative position 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
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Geographic areas

Country State
United States Alaska


Commodity Importance
Thorium Primary
Uranium Primary
Niobium (Columbium) Secondary
Yttrium Secondary

Comments on the commodity information

  • Ore Material = Unidentified Nb-U-Ti mineral
  • Ore Material = Unidentified Nb-U-Ti mineral

Materials information

Materials Type of material
Xenotime Ore
Zircon Ore
Epidote Gangue
Fluorite Gangue
Goethite Gangue
Limonite Gangue


  • (Local) An unidentified red, waxy mineral is altered to goethe and limonite.

Host and associated rocks

  • Host or associated Host
    Rock type Plutonic Rock > Ultramafic Intrusive Rock > Hornblendite
    Stratigraphic age (youngest) Late Cretaceous
    Stratigraphic age (youngest) Late Cretaceous

Nearby scientific data

(1) -160.66034, 66.13137

Comments on the geologic information

  • 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).
  • Age = Cretaceous.

Economic information

Economic information about the deposit and operations

Development status Prospect
Commodity type Metallic

Comments on exploration

  • Status = Inactive

Mining district

District name Selawik

Comments on the workings information

  • Workings / Exploration = Shallow prospect pits and at least 2 drill holes are evidence of earlier exploration. The exploration apparently took place in the mid-1970's and may have been more extensive than is evident. No information is available on that exploration (Barker, 1985).

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS A013504
USGS Alaska Resource Data File ARDF SE006

Bibliographic references

  • Deposit

    Grybeck, D.J., 1977, Known mineral deposits of the Brooks Range, Alaska: US Geological Survey Open-File Report 77-166C, 41 p., 1 sheet, scale 1:1,000,000.

  • Deposit

    Barker, J.C., 1985, Sampling and analytical results of a mineral reconnaissance in the Selawik Hills area, northwestern Alaska: U.S. Bureau of Mines Open-File Report 43-85, 67 p.

Comments on the references

  • Primary Reference = Barker, 1985

General comments

Subject category Comment text
Deposit Model Name = Disseminated radioactive minerals in syenite.

Reporter information

Type Date Name Affiliation Comment
Reporter 02-DEC-99 Williams, Anita U.S. Geological Survey