Unnamed (southeast of Jimmy Lake)

The Unnamed (southeast of Jimmy Lake) is a uranium, lead, and thorium mine located in Alaska.

About the MRDS Data:

All mine locations were obtained from the USGS Mineral Resources Data System. The locations and other information in this database have not been verified for accuracy. It should be assumed that all mines are on private property.

Mine Info

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MRDS mine locations are often very general, and in some cases are incorrect. Some mine remains have been covered or removed by modern industrial activity or by development of things like housing. The satellite view offers a quick glimpse as to whether the MRDS location corresponds to visible mine remains.

Site Name

Primary: Unnamed (southeast of Jimmy Lake)

Commodity

Primary: Uranium
Primary: Lead
Primary: Thorium
Secondary: Zinc

Location

State: Alaska
District: McGrath

Land Status

Not available

Holdings

Not available

Workings

Not available

Ownership

Not available

Production

Not available

Deposit

Record Type: Site
Operation Category: Occurrence
Operation Type: Unknown
Years of Production:
Organization:
Significant:

Physiography

Not available

Mineral Deposit Model

Not available

Orebody

Not available

Structure

Not available

Alterations

Alteration Type: L
Alteration Text: Oxidation.

Rocks

Name: Hornblendite
Role: Associated
Age Type: Host Rock
Age Young: Pliocene

Name: Hornblendite
Role: Associated
Age Type: Associated Rock Unit
Age Young: Pliocene

Name: Hornblendite
Role: Associated
Age Type: Associated Rock
Age Young: Pliocene

Analytical Data

Not available

Materials

Ore: Arsenopyrite
Ore: Galena
Ore: Sphalerite

Comments

Comment (Geology): Age = Tertiary. Uranium is enriched along fractures in Tertiary granite.

Comment (Commodity): Ore Material = unidentified uranium- and thorium-bearing minerals

Comment (Reference): Primary Reference = Reed and Miller, 1980

Comment (Workings): Workings / Exploration = Reconnaissance sampling has been completed in this area.

Comment (Geology): 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.

Comment (Commodity): Ore Material = unidentified uranium- and thorium-bearing minerals

Comment (Deposit): Model Name = Fracture-controlled, U-bearing veins in granite

Comment (Exploration): Status = Inactive

References

Reference (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.

Reference (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.

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