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Unnamed (southeast of Jimmy Lake)

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

Identification information

Deposit ID 10002177
MRDS ID A013074
Record type Site
Current site name Unnamed (southeast of Jimmy Lake)

Geographic coordinates

Geographic coordinates: -153.19249, 61.69476 (WGS84)
Relative position This occurrence is on the south side of the pass between Styx River and South Fork Kuskokwim River valleys, just south of Jimmy Lake. It is at an elevation of about 3,800 feet, 2 miles southeast of Jimmy Lake. The map site is in the NW1/4 section 36, T 19 N, R 22 W, of the Seward Meridian. It is sample locality 25 of Reed and Miller (1980) and is included as an unnamed occurrence by Cobb and Reed (1981). The location is probably accurate to within one quarter of a mile.
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Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Lead Primary
Thorium Primary
Uranium Primary
Zinc Secondary

Comments on the commodity information

  • Ore Material = unidentified uranium- and thorium-bearing minerals
  • Ore Material = unidentified uranium- and thorium-bearing minerals

Materials information

Materials Type of material
Arsenopyrite Ore
Galena Ore
Sphalerite Ore

Alteration

  • (Local) Oxidation.

Host and associated rocks

  • Host or associated Associated
    Rock type Plutonic Rock > Ultramafic Intrusive Rock > Hornblendite
    Rock unit name Styx River Batholith
    Rock description Styx River Batholith
    Stratigraphic age (youngest) Pliocene
    Stratigraphic age (youngest) Pliocene
    Stratigraphic age (youngest) Pliocene
  • Host or associated Host
    Rock type Plutonic Rock > Ultramafic Intrusive Rock > Hornblendite

Nearby scientific data

(1) -153.19249, 61.69476
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Comments on the geologic information

  • Geologic Description = Granite porphyry of the Tertiary Styx River pluton contains 14.8 ppm uranium and 38.3 ppm thorium, and grab samples of radioactive hornblende granite contain as much as 882 ppm uranium (Reed and Miller, 1980; Cobb and Reed, 1981). The uranium is enriched along iron-stained joint surfaces that also contain arsenopyrite, galena, and sphalerite(?). Purple fluorite is an abundant accessory mineral in the granite.
  • Age = Tertiary. Uranium is enriched along fractures in Tertiary granite.

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 = Reconnaissance sampling has been completed in this area.

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS A013074
USGS Alaska Resource Data File ARDF LH013

Bibliographic references

  • Deposit

    Reed, B.L., and Miller, T.P., 1980, Uranium and thorium content of some Tertiary granitic rocks in the southern Alaska Range: U.S. Geological Survey Open-File Report 80-1052, 16 p.

  • Deposit

    Cobb, E.H., and Reed, B.L., 1981, Summaries of data on and lists of references to metallic and selected nonmetallic mineral occurrences in the Iliamna, Lake Clark, Lime Hills, and McGrath quadrangles, Alaska; Supplement to Open-File Report 76-485; Part A, Summaries to January 1, 1981: U.S. Geological Survey Open-File Report 81-1343-A, 25 p.

Comments on the references

  • Primary Reference = Reed and Miller, 1980

General comments

Subject category Comment text
Deposit Model Name = Fracture-controlled, U-bearing veins in granite

Reporter information

Type Date Name Affiliation Comment
Reporter 10-JUN-2001 Travis L. Hudson Applied Geology
Reporter 10-JUN-2001 Travis L. Hudson Applied Geology