Unnamed

Occurrence in Alaska, United States with commodity Copper

Geologic information

Identification information

Deposit ID 10003601
MRDS ID A106359
Record type Site
Current site name Unnamed

Geographic coordinates

Geographic coordinates: -153.20269, 60.79946 (WGS84)
Relative position On peak 4,910 in the Neacola Mountains. In Sec. 5, T. 8 N., R. 22 W., of the Seward Meridian. Accurate within 5 km.
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Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Copper Primary

Materials information

Materials Type of material
Chalcopyrite Ore

Alteration

  • (Local) Plagioclase phenocrysts in the granodiorite show varying degrees of sericitization (Nelson and others, 1983).

Mineral occurrence model information

Model code 59
USGS model code 18b
Deposit model name Skarn Cu
Mark3 model number 8

Nearby scientific data

(1) -153.20269, 60.79946

Comments on the geologic information

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

Economic information

Economic information about the deposit and operations

Development status Occurrence
Commodity type Metallic

Comments on exploration

  • Status = Inactive

Mining district

District name Bristol Bay

Comments on the production information

  • Production Notes = No production

Comments on the reserve resource information

  • Reserves = No reserves

Comments on the workings information

  • Workings / Exploration = Unknown

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS A106359
USGS Alaska Resource Data File ARDF LC010

Bibliographic references

  • 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.

  • 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.

  • 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.

Comments on the references

  • Primary Reference = Lambeth, 1978

General comments

Subject category Comment text
Deposit Model Name = Cu skarn (Cox and Singer, 1986; model 18b)
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).

Reporter information

Type Date Name Affiliation Comment
Reporter 15-JUN-1998 D.P. Bickerstaff U.S. Geological Survey