The Unnamed is a thorium and uranium 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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Unnamed MRDS details
Site Name
Primary: Unnamed
Commodity
Primary: Thorium
Primary: Uranium
Secondary: Zirconium
Secondary: Tin
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
Model Name: Alkaline margin fluorite
Orebody
Not available
Structure
Not available
Alterations
Alteration Text: Feldspars are altered to clay minerals; quartz is a 'smokey' variety, possibly due to radioactive decay.
Rocks
Not available
Analytical Data
Not available
Materials
Ore: Thorite
Gangue: Feldspar
Gangue: Quartz
Comments
Comment (Exploration): Status = Inactive
Comment (Geology): Age = Late Tertiary, based on age (25Ma) of Windy Fork composite pluton (Solie and others, 1991).
Comment (Commodity): Ore Material = uranothorite
Comment (Workings): Workings / Exploration = The occurrence was found by the late Bruce Reed while conducting mineral resource investigations and regional geologic mapping for the U.S. Geological Survey in the western Alaska Range (Reed and Miller, 1980). Composite grab samples of quartz-feldspar-hematite joint-filled material as reported by Reed and Miller (1980) contain up to 490 ppm uranium and 376 ppm thorium.
Comment (Reference): Primary Reference = Reed and Miller, 1980
Comment (Geology): Geologic Description = The occurrence consists mainly of several feldspar-hematite-quartz veins infilling joints and fractures in the Windy Fork composite pluton about one mile from the contact zone with sandstone and limestone of the Lower to mid-Paleozoic Dillinger subterrane (Reed and Miller, 1980; Gilbert and others, 1988; Bundtzen, Harris, and Gilbert, 1997). The individual joint fillings are 3 to 6 centimeters thick and continue for 2 to 3 meters along strike. Much of the mineralization trends N65W. Feldspars are typically altered to a clay matrix; quartz is the 'smokey' variety due to radioactive(?) decay (Gunter and others, 1993). Green-to-purple fluorite is common in talus but was not recognized in place. Composite grab samples of quartz-feldspar-hematite joint-filled material reported by Reed and Miller (1980) contain up to 490 ppm uranium and 376 ppm thorium.
Comment (Reserve-Resource): Reserves = None estimated.
Comment (Deposit): Other Comments = See Eudialyte Prospect (MG036).
Comment (Deposit): Model Name = Thorium-Rare Earth veins (Cox and Singer, 1986; model 11b).
References
Reference (Deposit): Gilbert, W.G., Solie, D.N., and Kline, J.T., 1988, Geologic map of the McGrath A-3 quadrangle, Alaska: Alaska Division of Geological and Geophysical Surveys Professional Report 92, 2 sheets, 1:63,360 scale.
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.
Reference (Deposit): Gunter, M.E., Johnson, N.E., Knowles, C.R., and Solie, D.N., 1993, Optical, x-ray, and chemical analyses of four eudialytes from Alaska: Mineralogical Magazine, v. 57, p. 741-744.
Reference (Deposit): Solie, D.N., Bundtzen, T.K., and Gilbert, W.G., 1991, K-Ar ages of igneous rocks in the McGrath quadrangle, Alaska: Alaska Division of Geological and Geophysical Surveys Public Data File Report 160, 17 pages, one sheet, 1:250,000 scale.
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