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Unnamed (in Sischu Creek valley)

Occurrence in Alaska, United States with commodities Thorium, Uranium
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Geologic information

Identification information

Deposit ID 10001660
MRDS ID A012437
Record type Site
Current site name Unnamed (in Sischu Creek valley)

Geographic coordinates

Geographic coordinates: -153.15299, 63.97953 (WGS84)
Relative position Occurence is located in Sischu Creek valley at an approximate elevation of 1,000 feet (304 m) in Section 35, T. 17 S., R. 29 E., of the Kateel River Meridian. Location is imprecise and only known to within a one mile (1.6 km) radius.
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Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Thorium Primary
Uranium Primary

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) -153.15299, 63.97953
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Comments on the geologic information

  • Geologic Description = Quartz-rhyolite porphyry was found to contain anomalous thorium and uranium. Ore minerals were not identified (Miller and others, 1980; Clautice and others, 1993). Mineralization is inferred to be Early Tertiary, based on isotopic ages from Sischu Volcanic Field (Moll and others, 1980). Miller and others (1980) report up to 16.5 ppm uranium, and 70.4 ppm thorium from grab samples.
  • Age = Inferred to be Early Tertiary, based on isotopic ages from Sischu Volcanic Field (Moll and others, 1980).

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 up to 16.5 ppm U, and 70.4 ppm Th from grab samples.

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS A012437
USGS Alaska Resource Data File ARDF MD001

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 = Miller and others, 1980

General comments

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

Reporter information

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