Unnamed (overlooking Cheeneetnuk River)

The Unnamed (overlooking Cheeneetnuk River) is a copper 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 (overlooking Cheeneetnuk River)

Commodity

Primary: Copper
Secondary: Silver

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 replacement

Orebody

Not available

Structure

Not available

Alterations

Not available

Rocks

Not available

Analytical Data

Not available

Materials

Ore: Pyrite

Comments

Comment (Exploration): Status = Inactive

Comment (Workings): Workings / Exploration = W.G. Gilbert sampled the gossan during geologic mapping for the Alaska Division of Geological and Geophysical Surveys in 1978 (Gilbert, 1981). Four grab samples taken along the strike of the zone consistently yielded anomalous copper and silver with values of up to 224 ppm copper and 1.9 grams/tonne silver (Gilbert, 1981).

Comment (Geology): Geologic Description = The unnamed occurrence is a large zone of pyritic gossan in argillite of the Upper Paleozoic Mystic subterrane near the Cheeneetnuk Thrust Fault system (Gilbert, 1981; Wilson and others, 1998). The pyrite-rich gossan can be traced for more than 300 meters of strike length; mineralized widths were not determined. A Tertiary (37.8 Ma) granite is exposed about one quarter mile from the gossan (Gilbert, 1981). Four grab samples taken along the strike of the zone consistently yielded anomalous copper and silver with values of up to 224 ppm copper and 1.9 grams/tonne silver (Gilbert, 1981).

Comment (Deposit): Model Name = Polymetallic replacement (?) (Cox and Singer, 1986; model 19a).

Comment (Reference): Primary Reference = Gilbert, 1981

References

Reference (Deposit): Wilson, F.H., Dover, J.H., Bradley, D.C., Weber, F.R., Bundtzen, T.K., and Haeussler, P.J., 1998, Geologic map of central (interior) Alaska: U.S. Geological Survey Open-File Report 98-133, 17 p., 2 sheetsm, scale 1:500,000.

Reference (Deposit): Gilbert, W.G., 1981, Preliminary geologic map of the Cheeneetnuk River area, Alaska: Alaska Division of Geological and Geophysical Surveys Open-File Report 153, 19 pages, 2 sheets, 1:63,360 scale.

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