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Unnamed

Occurrence in Alaska, United States with commodities Niobium (Columbium), Thorium, Uranium, REE, Tungsten, Cerium
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Geologic information

Identification information

Deposit ID 10001663
MRDS ID A012440
Record type Site
Current site name Unnamed

Geographic coordinates

Geographic coordinates: -153.1791, 63.96064 (WGS84)
Relative position 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).
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Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Niobium (Columbium) Primary
Thorium Primary
Uranium Primary
REE Secondary
Tungsten Secondary
Cerium Secondary

Alteration

  • (Local) Smoky quartz.

Mineral occurrence model information

Model code 155
USGS model code 25f
BC deposit profile D06
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) Paleocene
  • Host or associated Host
    Rock type Volcanic Rock (Aphanitic) > Felsic Volcanic Rock > Rhyolite

Nearby scientific data

(1) -153.1791, 63.96064
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Comments on the geologic information

  • 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.
  • Age = Inferred to be early Tertiary, based on isotopic ages from Sischu Volcanics (Moll and others, 1981).

Economic information

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 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.

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS A012440
USGS Alaska Resource Data File ARDF MD004

Bibliographic references

  • Deposit

    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, 27 pages.

  • Deposit

    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 and Geophysical Surveys, 42 p., 1 sheet, scale 1:250,000.

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, MD002, and MD003.

Reporter information

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