Occurrence in Alaska, United States with commodity Copper

Geologic information

Identification information

Deposit ID 10003087
MRDS ID A015616
Record type Site
Current site name Eskimo

Geographic coordinates

Geographic coordinates: -161.68362, 67.50945 (WGS84)
Relative position This occurrence is at an elevation of about 7 miles southeast of the headwaters of Agashashok River. It is in section 12, T.24 N., R. 14 W., of the Kateel River Meridian. Location is accurate to within 3,000 feet. Grybeck (1977), location 2, Schmidt and Allegro (1988), location 72.
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Geographic areas

Country State
United States Alaska


Commodity Importance
Copper Primary

Materials information

Materials Type of material
Chalcocite Ore
Malachite Ore


  • (Local) Bleaching of limestone.

Host and associated rocks

  • Host or associated Host
    Rock type Sedimentary Rock > Carbonate > Limestone

Nearby scientific data

(1) -161.68362, 67.50945

Comments on the geologic information

  • Geologic Description = The bedrock in this area is mapped as Devonian Skajit limestone, dolomite and marble with gray phyllite (Schmidt and Allegro, 1988). This occurrence consists of chalcocite and malachite in bleached limestone. The bedrock is cut by small quartz stringers.
  • Age = Devonian

Economic information

Economic information about the deposit and operations

Development status Occurrence
Commodity type Metallic

Comments on exploration

  • Status = Active

Mining district

District name Noatak

Comments on the workings information

  • Workings / Exploration = Twenty-five claims were staked in the area in 1966. There was renewed activity in the area in the 1990's by local prospectors who have been mapping and sampling the area (Roy Barr, personal communication, 1997).

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS A015616
USGS Alaska Resource Data File ARDF BM013

Bibliographic references

  • 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

    Schmidt, J.M., and Allegro, G.L., 1988, Map showing mineral occurrences and indicators in the Baird Mountains quadrangle, northwestern Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-1992, 1 sheet, scale 1:250,000.

  • Deposit

    Cobb, E.H., Mayfield, C.F., and Brosge, W.P., 1981, Summaries of data on and lists of references to metallic and selected nonmetallic mineral occurrences in eleven quadrangles in northern Alaska (Arctic, Baird Mountains, Chandler Lake, DeLong Mountains, Demarcation Point, Howard Pass, Misheguk Mountain, Mount Michelson, Noatak, Point Lay, and Table Mountain); Supplement to Open-File Report 75-628; Part A, Summaries of data to January 1, 1981: U.S. Geological Survey Open-File Report 81-767-A, 25 p.

Comments on the references

  • Primary Reference = Grybeck, 1977

General comments

Subject category Comment text
Deposit Model Name = Sulfide-bearing quartz stringers in Paleozoic limestone.
Deposit Other Comments = Located within the Noatak National Preserve.

Reporter information

Type Date Name Affiliation Comment
Reporter 29-DEC-99 Williams, Anita U.S. Geological Survey