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  3. Mineral Resource Data System (MRDS)

Uranium 4 (in Selawik Hills)

Occurrence in Alaska, United States with commodities Thorium, Uranium
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Sections on this page
  1. Identification information
  2. Geographic coordinates
  3. Site location context
  4. Geographic areas
  5. Commodities
  6. Materials information
  7. Alteration
  8. Host and associated rocks
  9. Nearby scientific data
  10. Economic information about the deposit and operations
  11. Mining district
  12. Links to other databases
  13. Bibliographic references
  14. General comments
  15. Reporter information

Geologic information

Identification information

Deposit ID 10002563
MRDS ID A013506
Record type Site
Current site name Uranium 4 (in Selawik Hills)

Geographic coordinates

Geographic coordinates: -160.21729, 66.1575 (WGS84)
Relative position This occurrence is at an elevation of about 1,900 feet in the NW1/4 section 29, T. 9 N., R. 7 W., of the Kateel River Meridian. Barker (1985), location I, sample 59R.

Site location context

Political divisions (FIPS codes)

Northwest Arctic(Borough)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Selawik A-3(quadrangle 1:63,360 scale)

Selawik S(quadrangle 1:100,000 scale)

Selawik C(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Selawik Lake(hydrologic unit)

Kobuk-Selawik Rivers(hydrologic accounting unit)

Northwest(hydrologic subregion)

Alaska(hydrologic region)

Federal lands

BLM(Federal land areas administered by BLM)

Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Thorium Primary
Uranium Primary

Materials information

Materials Type of material
Xenotime Ore

Alteration

  • (Local) Biotization.

Host and associated rocks

  • Host or associated Associated
    Rock type Metamorphic Rock > Schist
  • Host or associated Host
    Rock type Plutonic Rock > Granitoid > Syenite

Nearby scientific data

(1) Ksy
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = The country rock in the area of this occurrence is the mid-Cretaceous Selawik Hills alkaline intrusive complex. The occurrence is one of several areas of anomalous radioactivity within the complex. According to Barker (1985), at location I, quartz veinlets associated with lineaments tentatively identified as shear zones cut foliated syenite and monzonite. The syenite and monzonite have been partially replaced by silica and chlorite. The margins of the presumed shear zones are more intensely altered and are host to quartz veinlets up to 0.5 inch thick. Accessory xenotime was observed in a thin section of this rock. Secondary biotite is locally present. Grab sample 59R, from the biotite alteration, contained 220 ppm U3O8 and 36 ppm Th. Radiometric readings over the presumed shear zones were 1.5 to 2 times background.
  • Age = Cretaceous.

Economic information about the deposit and operations

Development status Occurrence
Commodity type Metallic

Comments on exploration

  • Status = Inactive

Mining district

District name Selawik

Comments on the workings information

  • Workings / Exploration = A grab sample from this site was analyzed by the U.S. Bureau of Mines (Barker, 1985).

Reference information

Bibliographic references

  • 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 = Radioactive shear zone in alkaline igneous complex.

Reporter information

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

Beyond USGS

Supplemental information added by qvyshift.com. Not part of the original USGS MRDS record.

Maps centered on this site

Authoritative Alaska resources

These are landing pages for further research — the state agencies don't currently expose per-mine deep links.