Unnamed (along Kuskokwim River)

The Unnamed (along Kuskokwim River) is a lead, copper, and silver 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 (along Kuskokwim River)

Commodity

Primary: Lead
Primary: Copper
Primary: Silver
Secondary: Nickel

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: Polymetallic veins

Orebody

Not available

Structure

Not available

Alterations

Alteration Type: L
Alteration Text: Ferricrete oxidation of pyrite and pyrrhotite.

Rocks

Not available

Analytical Data

Not available

Materials

Ore: Pyrrhotite
Ore: Pyrite
Gangue: Quartz

Comments

Comment (Deposit): Model Name = Polymetallic veins (Cox and Singer, 1986; model 22c).

Comment (Geology): Geologic Description = This occurrence consists of pyrite-pyrrhotite nodules in highly deformed, sheared shale and siltstone of the Late Cretaceous Kuskokwim Group (Bundtzen and Laird, 1983). Individual sulfide nodules average about 8 centimeters in diameter, and are locally oxidized to ferricrete gossan. The sulfide bearing zone, which appears to be parallel to steeply dipping bedding in the host sedimentary rocks, is about 3 meters thick. The sulfide zone quickly extends upward into the vegetated slopes (Bundtzen and Laird, 1983). Cobb (1972) and Brooks and Martin (1921) refer to the occurrence as an unnamed, copper-nickel lode. A selected grab sample reported by Bundtzen and Laird (1983) contains 12.26 grams/tonne silver, 116 ppm copper, 167 ppm lead, and 139 ppm nickel.

Comment (Reference): Primary Reference = Bundtzen and Laird, 1983

Comment (Workings): Workings / Exploration = Brooks and Martin (1921) first mentioned the existence of sulfide mineralization at the site. A selected grab sample reported by Bundtzen and Laird (1983) contains 12.26 grams/tonne silver, 116 ppm copper, 167 ppm lead, and 139 ppm nickel.

Comment (Exploration): Status = Inactive

References

Reference (Deposit): Cobb, E.H., 1972, Metallic mineral resources map of the McGrath quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-379, 1 sheet, 1:250,000 scale.

Reference (Deposit): Bundtzen, T.K., and Laird, G.M., 1983, Geologic map of the McGrath D-6 quadrangle, Alaska: Alaska Division of Geological and Geophysical Surveys Professional Report 79, 1 sheet, scale 1:63,360.

Reference (Deposit): Brooks, A.H., and Martin, G. C. 1921, The Alaska mining industry in 1919: U.S. Geological Survey Bulletin 714, p. 59-95.

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