Okpilak River

Occurrence in Alaska, United States with commodities Molybdenum, Uranium, Fluorine-Fluorite, REE

Geologic information

Identification information

Deposit ID 10003389
MRDS ID A106145
Record type Site
Current site name Okpilak River

Geographic coordinates

Geographic coordinates: -144.0234, 69.29988 (WGS84)
Relative position Accurate to within 1.6 kilometers (1 mi). Grybeck, 1977, p. 40, Location 13.
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Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Molybdenum Primary
Uranium Primary
Fluorine-Fluorite Secondary
REE Secondary

Comments on the commodity information

  • Gangue = yttrocerite

Materials information

Materials Type of material
Molybdenite Ore
Fluorite Gangue

Host and associated rocks

  • Host or associated Host
    Rock type Plutonic Rock > Granitoid > Granite
    Stratigraphic age (youngest) Early Devonian
    Stratigraphic age (youngest) Early Devonian

Nearby scientific data

(1) -144.0234, 69.29988

Comments on the geologic information

  • Geologic Description = Fluorite, molybdenite and (?)yttrocerite occur in samples of granite of Okpilak batholith. Representative sample in peripheral zone of granite contains 50 ppm eU. Heavy mineral fractions of concentrates contain 0.034-0.080% eU and 0.010-0.033% U.
  • Age = Probably Early Devonian

Economic information

Economic information about the deposit and operations

Development status Occurrence
Commodity type Metallic

Comments on exploration

  • Status = Inactive

Mining district

District name Canning

Comments on the workings information

  • Workings / Exploration = None

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS A106145
USGS Alaska Resource Data File ARDF ML015

Bibliographic references

  • Deposit

    Cobb, E.H., Mayfield, C.F., and Brosg?, W.P., 1981, Summaries of data on and lists of references to metallic and selected nonmetallic mineral occurrences in eleven quadrangles in northern Alaska (Arctic, Baird Mountains, Chandler Lake, DeLong Mountains, Demarcation Point, Howard Pass, Misheguk Mountain, Mount Michelson, Noatak, Point Lay, and Table Mountain); Supplement to Open-File Report 75-628; Part A, Summaries of data to January 1, 1981: U.S. Geological Survey Open-File Report 81-767-A, 25 p.

  • Deposit

    Cobb, E.H., Mayfield, C.F., and Brosge, W.P., 1981, Summaries of data on and lists of references to metallic and selected nonmetallic mineral occurrences in eleven quadrangles in northern Alaska (Arctic, Baird Mountains, Chandler Lake, DeLong Mountains, Demarcation Point, Howard Pass, Misheguk Mountain, Mount Michelson, Noatak, Point Lay, and Table Mountain); Supplement to Open-File Report 75-628; Part A, Summaries of data to January 1, 1981: U.S. Geological Survey Open-File Report 81-767-A, 25 p.

General comments

Subject category Comment text
Deposit Model Name = Disseminated, felsic-hosted

Reporter information

Type Date Name Affiliation Comment
Reporter 15-SEP-1996 Schmidt, J.M. U.S. Geological Survey
Reporter 15-SEP-1996 Kelley, J.S. U.S. Geological Survey