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Unnamed (west of Nahtuk Mountain)

Occurrence in Alaska, United States with commodities Cadmium, Zinc, Silver
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Geologic information

Identification information

Deposit ID 10001208
MRDS ID A011921
Record type Site
Current site name Unnamed (west of Nahtuk Mountain)

Geographic coordinates

Geographic coordinates: -153.27538, 67.60074 (WGS84)
Relative position This site is at an elevation of about 4400 feet, 3.75 miles west of Nahtuk Mountain. It is in the N1/2 of sec. 5, T. 25 N., R. 25 E., of the Kateel River Meridian. Accuracy of location is within 100 ft. The site corresponds to locality 37 of Grybeck and Nelson (1981).
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Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Cadmium Primary
Zinc Primary
Silver Secondary

Materials information

Materials Type of material
Sphalerite Ore

Host and associated rocks

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

Nearby scientific data

(1) -153.27538, 67.60074
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Comments on the geologic information

  • Geologic Description = This occurrence consists of small amounts of sphalerite in quartz veinlets and as disseminated grains in a prominent orange-weathering knob about 30 feet in diameter (Grybeck and Nelson, 1981). The knob consists of dark-gray limestone that is faulted(?) into a sequence of calcareous muscovite phyllite. Selected samples contain more than 1 percent Zn, 500 ppm Cd, and up to 2 ppm Ag. Apparently the mineralized rock is restricted to the knob.

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

Comments on the workings information

  • Workings / Exploration = Site visted during regional geologic mapping by the USGS in the late 1970s.

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS A011921
USGS Alaska Resource Data File ARDF SP017

Bibliographic references

  • Deposit

    Grybeck, D.J., and Nelson, S.W., 1981, Mineral deposit map of the Survey Pass quadrangle, Brooks Range, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-1176-F, 1 sheet, scale 1:250,000.

Comments on the references

  • Primary Reference = Grybeck and Nelson, 1981

General comments

Subject category Comment text
Deposit Other Comments = Located within Gates of the Arctic National Park.

Reporter information

Type Date Name Affiliation Comment
Reporter 20-SEP-1999 S.W. Nelson U.S. Geological Survey