Unnamed (south of the Hammond River)

Occurrence in Alaska, United States with commodity Copper

Geologic information

Identification information

Deposit ID 10001409
MRDS ID A012154
Record type Site
Current site name Unnamed (south of the Hammond River)

Geographic coordinates

Geographic coordinates: -149.98335, 67.6297 (WGS84)
Relative position This site is at an elevation of about 4,300 feet, on a ridge south of the Hammond River, approximately 6 1/2 miles west-northwest of Sukakpak Mountain and 5 1/2 miles north of Jennie Creek Lake (SW1/4 sec. 3, T. 32 N., R. 11 W., of the Fairbanks Meridian). This site corresponds to unnamed loc. 76 in DeYoung (1978). The location is accurate within a 1-mile radius.
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Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Copper Primary

Comments on the commodity information

  • Ore Material = Unspecified copper sulfides and/or malachite-azurite

Host and associated rocks

  • Host or associated Associated
    Rock type Sedimentary Rock > Carbonate > Limestone
    Rock unit name Skajit Limestone
    Rock description Skajit Limestone
    Stratigraphic age (youngest) Late Silurian
    Stratigraphic age (youngest) Late Silurian
  • Host or associated Host
    Rock type Sedimentary Rock > Clastic Sedimentary Rock > Siltstone

Nearby scientific data

(1) -149.98335, 67.6297

Comments on the geologic information

  • Geologic Description = An occurrence of Cu sulfides and/or malachite-azurite stains is in an area mapped as Middle to Upper Devonian(?) conglomerate in a more extensive unit of black slate, phyllite, and chloritic siltstone (Dillon and Reifenstuhl, 1995). These rocks are all part of the Beaucoup Formation. No other information is available.

Economic information

Economic information about the deposit and operations

Development status Occurrence
Commodity type Metallic

Comments on exploration

  • Status = Inactive

Mining district

District name Koyukuk

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS A012154
USGS Alaska Resource Data File ARDF CH082

Bibliographic references

  • Deposit

    Brosgi, W.P., and Reiser, H.N., 1964, Geologic map and section of the Chandalar quadrangle, Alaska: U.S. Geological Survey Miscellaneous Geologic Investigations Map 1-375, 1 sheet, scale 1:250,000.

  • Deposit

    Cobb, E.H., 1972, Metallic mineral resources map of the Chandalar quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-457, 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 Chandalar and Wiseman quadrangles, Alaska: U.S. Geological Survey Open-File Report 76-340, 205 p.

  • Deposit

    Grybeck, D.J., 1977, Known mineral deposits of the Brooks Range, Alaska: US Geological Survey Open-File Report 77-166C, 41 p., 1 sheet, scale 1:1,000,000.

  • Deposit

    DeYoung, J.H., Jr., 1978, Mineral resources map of the Chandalar quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-878-B, 2 sheets, scale 1:250,000.

  • Deposit

    Cobb, E.H., and Cruz, E.L., 1983, Summaries of data and lists of references to metallic and selected nonmetallic mineral deposits in the Chandalar quadrangle, Alaska: U.S. Geological Survey Open-File Report 83-278, 91 p.

Comments on the references

  • Primary Reference = Brosgi and Reiser, 1964

General comments

Subject category Comment text
Deposit Other Comments = A small outcrop, mapped by Dillon and Reifenstuhl (1995) as andesite tuff-dacite flow, is located adjacent to the conglomerate unit about 1/2 mile southeast of the Cu occurrence. This occurrence is located within Gates of the Arctic National Park.

Reporter information

Type Date Name Affiliation Comment
Reporter 17-NOV-1999 J.M. Britton U.S. Geological Survey