Unnamed (north of Inyuilak Creek)

Occurrence in Alaska, United States with commodities Silver, Bismuth, Copper, Tin, Zinc

Geologic information

Identification information

Deposit ID 10308333
Record type Site
Current site name Unnamed (north of Inyuilak Creek)

Geographic coordinates

Geographic coordinates: -154.95254, 67.31059 (WGS84)
Relative position This site is at an elevation of about 4000 feet on a ridge 3 miles north of Inyuilak Creek. It is in the N1/2 of sec. 18, T. 22 N., R. 18 E., of the Kateel River Meridian. The location is accurate to within 1000 ft. The site corresponds to locality 44 of Grybeck and Nelson (1981).
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Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Silver Primary
Bismuth Primary
Copper Primary
Tin Primary
Zinc Primary

Mineral occurrence model information

Model code 43
USGS model code 14b
Deposit model name Sn skarn

Nearby scientific data

(1) -154.95254, 67.31059

Comments on the geologic information

  • Geologic Description = This occurrence is a contact metamorphic deposit at the contact of Devonian granite and Paleozoic schist (Grybeck and Nelson, 1981). Selected samples contain up 5 ppm Ag, 100 ppm Bi, 1 percent Cu, 30 ppm Sn, and 700 ppm Zn. The deposit is related to intrusion of the granite and is similar to other contact-metamorphic deposits in the Brooks Range (Newberry and others, 1986).
  • Age = Devonian; related to the intrusion of Devonian pluton.

Economic information

Economic information about the deposit and operations

Development status Occurrence

Comments on exploration

  • Status = Inactive

Mining district

District name Shungnak

Comments on the workings information

  • Workings / Exploration = Site briefly examined 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 Alaska Resource Data File ARDF SP021

Bibliographic references

  • Deposit

    Nelson, S.W., and Grybeck, D.J., 1980, Geologic map of the Survey Pass quadrangle, Brooks Range, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-1176-A, 2 sheets, scale 1:250,000.

  • 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.

  • Deposit

    Newberry, R.J., Dillon, J.T., and Adams, D.D., 1986, Regionally metamorphosed calc-silicate-hosted deposits of the Brooks Range, northern Alaska: Economic Geology, v. 81, p. 1728-1752

Comments on the references

  • Primary Reference = Grybeck and Nelson, 1981

General comments

Subject category Comment text
Deposit Model Name = Skarn (Cox and Singer, 1986; model 14b)
Deposit Other Comments = Located within Gates of the Arctic National Park.

Reporter information

Type Date Name Affiliation Comment
Reporter 21-SEP-99 S.W. Nelson U.S. Geological Survey