Unnamed

The Unnamed 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

Commodity

Primary: Copper

Location

State: Alaska
District: Bristol Bay

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: Skarn Cu

Orebody

Not available

Structure

Not available

Alterations

Alteration Type: L
Alteration Text: Plagioclase phenocrysts in the granodiorite show varying degrees of sericitization (Nelson and others, 1983).

Rocks

Not available

Analytical Data

Not available

Materials

Ore: Chalcopyrite

Comments

Comment (Reserve-Resource): Reserves = No reserves

Comment (Production): Production Notes = No production

Comment (Reference): Primary Reference = Lambeth, 1978

Comment (Geology): Geologic Description = Skarn deposit: marble interbedded with schist, phyllite, and metamorphosed volcanic rocks in a large roof pendant in granitic rocks. Nelson and others (1983, unit Ki1) describe the granitic rocks as medium-grey, medium-grained sericitized granodiorite. Lambeth (1978) described the occurrence as several occurrences of chalcopyrite in roof pendant of interbedded limestone and andesite. Quite similar to the nearby Glacier Fork occurrence (ARDF number LC008) and another unnamed occurrence (ARDF number LC002). According to Nelson and others (1983, unit MzPzm), some of the metasedimentary rocks may correlate with the Kakhonak Complex of Permian (?), Triassic, and Jurassic age in the Iliamna quadrangle, and some may be graywacke of Jurassic and Cretaceous (?) age that has been metamorphosed by nearby plutonic rocks. Some of the metamorphosed volcanic rocks, especially in roof pendants, are probably part of the volcanic rocks of Tertiary age (Tv).

Comment (Deposit): Other Comments = MAS/MILS sequence number 0020930026 (Bureau of Mines, 1995). Site is in Lake Clark National Park and Preserve. This unnamed occurrence may actually be the Glacier Fork occurrence (ARDF number LC008).

Comment (Deposit): Model Name = Cu skarn (Cox and Singer, 1986; model 18b)

Comment (Workings): Workings / Exploration = Unknown

Comment (Exploration): Status = Inactive

Comment (Geology): Age = The granodiorite associated with the skarn has a Cretaceous age. The rocks of the roof pendant range in age from Permian to Tertiary .

References

Reference (Deposit): Lambeth, R.H., 1978, Mineral Appraisal of Certain Alaska National Interest Lands, Proposed Lake Clark National Park: A summary report: U.S. Bureau of Mines Open-File Number 114-78, 18 p.

Reference (Deposit): Nelson, W.H., Carlson, C., and Case, J.E., 1983, Geologic map of the Lake Clark quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-1114-A, scale 1:250,000.

Reference (Deposit): U.S. Bureau of Mines, 1995, Spatial data extracted from the Minerals Availability System/Minerals Industry Location System (MAS/MILS): U.S. Bureau of Mines Special Publication 12-95, CD-ROM.

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