The Unnamed is a tin 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: Tin
Secondary: Tungsten
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: Alluvial placer Sn
Orebody
Not available
Structure
Not available
Alterations
Alteration Text: None.
Rocks
Not available
Analytical Data
Not available
Materials
Ore: Cassiterite
Comments
Comment (Geology): Age = Quaternary.
Comment (Reference): Primary Reference = Bundtzen, Harris, and Gilbert, 1997
Comment (Workings): Workings / Exploration = Ellen E. Harris collected the staniferous samples during geochemical studies for the Alaska Division of Geological and Geophysical Surveys in 1988 (Bundtzen, Harris, and Gilbert, 1997). Analyses of panned concentrates indicate values of 2,100 ppm and 220 ppm tin and 230 ppm and 180 ppm tungsten from both gulches.
Comment (Geology): Geologic Description = These unnamed occurrences contain significant concentrations of tin and tungsten from panned heavy mineral fractions in second order stream basins. Stream gradients average 220 meters/kilometer (steep), and both gulches flow on bedrock. The area drains the contact zone of a 58 Ma granite that intrudes Lower Cretaceous flysch (Bundtzen, Harris, and Gilbert, 1997). The granite is the same age of the tin-bearing McKinley suite of plutons exposed throughout south central Alaska (Hudson and Reed, 1997). Several grains of cassiterite were identified in one pan concentrate. The mineralogical source of anomalous tungsten is unknown. Analyses of panned concentrates indicate values of 2,100 ppm and 220 ppm tin and 230 ppm and 180 ppm tungsten from both gulches.
Comment (Deposit): Model Name = Alluvial placer tin (Cox and Singer, 1986; model 39e).
Comment (Exploration): Status = Inactive
References
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.
Reference (Deposit): Bundtzen, T.K., Harris, E.E., and Gilbert, W.G., 1997, Geologic Map of the eastern McGrath quadrangle, Alaska: Alaska Division of Geological and Geophysical Surveys Report of Investigations 97-14, 34 pages, one sheet, scale 1:125,000.
Reference (Deposit): Hudson, T.L., and Reed, B.L., 1997, Tin deposits of Alaska, in Goldfarb, R.J., and Miller, L.D., eds., Mineral Deposits of Alaska: Economic Geology Monograph 9, p. 450-465.
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