Unnamed

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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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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