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Unnamed (north of Fisher Creek)

Occurrence in Alaska, United States with commodity Copper
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Geologic information

Identification information

Deposit ID 10002768
MRDS ID A015231
Record type Site
Current site name Unnamed (north of Fisher Creek)

Geographic coordinates

Geographic coordinates: -142.6628, 65.04977 (WGS84)
Relative position This occurrence is location 1 of Cobb (1972 [MF-390]). It is on a northwest-facing hillside at an elevation of about 3,100 feet, about 1.75 miles north of Fisher Creek, in section 33, T. 3 N., R. 25 E., of the Fairbanks Meridian. The coordinates are for the center of the prospect. The location is accurate to within one mile.
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Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Copper Primary

Comments on the commodity information

  • Gangue = Carbonate

Materials information

Materials Type of material
Azurite Ore
Chalcopyrite Ore
Malachite Ore
Quartz Gangue

Alteration

  • (Local) There is local oxidation of copper minerals.

Host and associated rocks

  • Host or associated Host
    Rock type Metamorphic Rock > Metavolcanic Rock > Mafic Metamorphic Rock > Greenstone

Nearby scientific data

(1) -142.6628, 65.04977
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Comments on the geologic information

  • Geologic Description = This unnamed occurrence is near a high-angle normal fault between Paleozoic to Precambrian pelitic schist on the south and Paleozoic phyllitic argillite on the north (Dover and Miyaoka, 1988). The occurrence consists of chalcopyrite and secondary copper minerals in quartz and carbonate veins in greenschist, greenstone, and thin carbonate layers. The vein material is estimated to be less than 3 percent of the exposed rock (Clark and Foster, 1971).

Economic information

Economic information about the deposit and operations

Development status Occurrence
Commodity type Metallic

Comments on exploration

  • Status = Probably inactive

Mining district

District name Circle

Comments on the workings information

  • Workings / Exploration = The area was mapped and sampled in the mid-1970s (Clark and Foster, 1971).

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS A015231
USGS Alaska Resource Data File ARDF CY033

Bibliographic references

  • Deposit

    Clark, S.H.B., and Foster, H.L., 1971, Geochemical and geological reconnaissance in the Seventymile River area, Alaska: U.S. Geological Survey Bulletin 1315, 21 p.

  • Deposit

    Cobb, E.H., 1972, Metallic mineral resources map of the Charley River quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-390, 1 sheet, scale 1:250,000.

  • Deposit

    Cobb, E.H., 1976, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Charley River and Coleen quadrangles, Alaska: U.S. Geological Survey Open-File Report 76-632, 45 p.

  • Deposit

    Dover, J.A., and Miyaoka, R.T., 1988, Reinterpreted geologic map and fossil data, Charley River quadrangle, east-central Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-2004, 2 sheets, scale 1:250,000.

Comments on the references

  • Primary Reference = Clark and Foster, 1971

General comments

Subject category Comment text
Deposit Model Name = Cu-quartz vein.
Deposit Other Comments = This site is within the Yukon-Charley Rivers National Preserve.

Reporter information

Type Date Name Affiliation Comment
Reporter 07-APR-00 Cameron, C.E. Alaska Division of Geological and Geophysical Surveys