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  3. Mineral Resource Data System (MRDS)

Unnamed

Occurrence in Alaska, United States with commodities Thorium, Uranium, REE, Cerium
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Sections on this page
  1. Identification information
  2. Geographic coordinates
  3. Site location context
  4. Geographic areas
  5. Commodities
  6. Alteration
  7. Mineral occurrence model information
  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 10001661
MRDS ID A012438
Record type Site
Current site name Unnamed

Geographic coordinates

Geographic coordinates: -153.0391, 63.98147 (WGS84)
Relative position 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).

Site location context

Political divisions (FIPS codes)

Yukon-Koyukuk(Census area)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Medfra D-1(quadrangle 1:63,360 scale)

Denali NW(quadrangle 1:100,000 scale)

Medfra(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

North Fork Kuskokwim River(hydrologic unit)

Upper Kuskokwim River(hydrologic accounting unit)

Southwest(hydrologic subregion)

Alaska(hydrologic region)

Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Thorium Primary
Uranium Primary
REE Critical Secondary
Cerium Critical Secondary

Alteration

  • (Local) Limonitic.

Mineral occurrence model information

Model code 155
USGS model code 25f
Deposit model name Volcanogenic U

Host and associated rocks

  • Host or associated Associated
    Rock type Volcanic Rock (Aphanitic) > Felsic Volcanic Rock > Rhyolite
    Stratigraphic age (youngest) Tertiary
    Stratigraphic age (oldest) Late Cretaceous
    Chronological age 66.3
    Dating method K-Ar
    Type of media Sanadine
  • Host or associated Host
    Rock type Volcanic Rock (Aphanitic) > Felsic Volcanic Rock > Rhyolite
    Stratigraphic age (youngest) Tertiary
    Stratigraphic age (oldest) Late Cretaceous
    Chronological age 66.3
    Dating method K-Ar
    Type of media Sanadine

Nearby scientific data

(1) -153.0391, 63.98147
ListMap

Economic information

Comments on the geologic information

  • 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.
  • Age = Early Tertiary, based on isotopic ages of Sischu Volcanics (Moll and others, 1980).

Economic information about the deposit and operations

Development status Occurrence
Commodity type Metallic

Comments on exploration

  • Status = Inactive

Mining district

District name McGrath

Comments on the workings information

  • Workings / 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.

Reference information

Comments on the references

  • Primary Reference = Clautice and others, 1993

General comments

Subject category Comment text
Deposit Model Name = Volcanogenic Uranium (Cox and Singer, 1986; model no. 25f)
Deposit Other Comments = See MD001.

Reporter information

Type Date Name Affiliation Comment
Reporter 07-JUN-98 Bundtzen, T.K. Pacific Rim Geological Consulting

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.