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Unnamed (north of Akabluak Pass)

Occurrence in Alaska, United States with commodities Silver, Copper, Lead, Zinc, Bismuth, Tin, Tungsten
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Geologic information

Identification information

Deposit ID 10001210
MRDS ID A011923
Record type Site
Current site name Unnamed (north of Akabluak Pass)

Geographic coordinates

Geographic coordinates: -154.68152, 67.47571 (WGS84)
Relative position This site is at an elevation of about 5000 feet about 2 miles north of Akabluak Pass. It is in the SE1/4 of sec. 17, T. 24 N., R. 19 E., of the Kateel River Meridian. The location is accurate to within 1000 ft. This site corresponds to locality 30 of Grybeck and Nelson (1981).
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Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Silver Primary
Copper Primary
Lead Primary
Zinc Primary
Bismuth Secondary
Tin Secondary
Tungsten Secondary

Materials information

Materials Type of material
Chalcopyrite Ore
Galena Ore
Sphalerite Ore
Arsenopyrite Gangue
Pyrrhotite Gangue

Mineral occurrence model information

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

Host and associated rocks

  • Host or associated Host
    Rock type Metamorphic Rock > Gneiss
    Rock unit name Igikpak Pluton;
    Rock description Igikpak Pluton;

Nearby scientific data

(1) -154.68152, 67.47571
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Comments on the geologic information

  • Geologic Description = This site represents several spot checks and short traverses to evaluate about one thousand feet of well-exposed contact of Devonian gneissic granite in contact with Paleozoic strata (Grybeck and Nelson, 1981). The occurrence consists of several small masses of ore minerals, a few feet across. These minerals include various combinations of chalcopyrite, pyrrhotite, sphalerite, arsenopyrite, and galena. The minerals occurr erratically in metamorphic rocks along 1000 ft. of the contact zone. This occurrence is one of several associated with the contact zone of the Mt. Igikpak pluton (Newberry and others, 1986).
  • Age = Devonian-related to intrusion of Devonian pluton.

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 = Selected hand specimens contain up to 200 ppm Ag, 1000 ppm Bi and W, and more than 1000 ppm Sn (Grybeck and Nelson, 1981). In general, however, the contact is shows little sign of skarn or introduction of metals, and there is no indication of any potential for an ore deposit of significant size.

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS A011923
USGS Alaska Resource Data File ARDF SP013

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.

  • 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)

Reporter information

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