Gemuk Mountain

Occurrence in Alaska, United States with commodities Gold, Antimony

Geologic information

Identification information

Deposit ID 10002514
MRDS ID A013455
Record type Site
Current site name Gemuk Mountain
Related records 10136986

Geographic coordinates

Geographic coordinates: -159.00277, 60.59934 (WGS84)
Relative position Gemuk Mountain is a 3,441 foot-high peak near the west boundary of the Taylor Mountains C-8 quadrangle. It is in the west headwaters of the Gemuk River. This occurrence is at an elevation of about 2,850 feet on a ridge a few thousand feet southwest of the summit of Gemuk Mountain. It is locality 6 of Clark and others (1970) and locality 5 of Cobb (1972 [MF 384]; 1976 [OF 76-606]).
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Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Gold Primary
Antimony Primary

Materials information

Materials Type of material
Gold Ore
Pyrite Ore
Stibnite Ore
Quartz Gangue

Mineral occurrence model information

Model code 180
USGS model code 27d
Deposit model name Simple Sb (veins, pods, etc)

Host and associated rocks

  • Host or associated Host
    Rock type Metamorphic Rock > Metasedimentary Rock > Quartzite

Nearby scientific data

(1) -159.00277, 60.59934

Comments on the geologic information

  • Geologic Description = This occurrence is a mineralized shear zone between granitic rocks and thermally metamorphosed quartzite and shale (Clark and others, 1970). Discontinuous gold-bearing quartz-stibnite masses, 1- to 6-inches wide, occur as pods and lenses in fault gouge and breccia. Polished sections show the vein margins to be quartz and stibnite and the cores to be silificied fragments of biotite diorite in a quartz matrix. Pyrite is common at the margins of the silicified biotite diorite fragments. The mineralized zone trends N 50 W, is nearly vertical, and at least 2 feet wide. Native gold is at the margins of the stibnite-rich pods and lenses. Three vein samples contained gold values of 82, 94, and 100 ppm (Clark and others, 1970).
  • Age = Late Cretaceous or Early Tertiary . Possibly the age of many granitic plutons in the region.

Economic information

Economic information about the deposit and operations

Development status Occurrence
Commodity type Metallic

Mining district

District name Aniak

Comments on the workings information

  • Workings / Exploration = Surface examination and sampling has occurred, probably including some by private companies since that of Clark and others (1970).

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS A013455
USGS Alaska Resource Data File ARDF TA016

Bibliographic references

  • Deposit

    Cobb, E.H., 1972, Metallic mineral resources map of the Taylor Mountains quadrangle: U.S. Geological Survey Miscellaneous Field Studies Map MF-384, scale 1:250,000.

  • Deposit

    Cobb, E.H., 1976, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Dillingham, Sleetmute, and Taylor Mountain quadrangles, Alaska: U.S. Geological Survey Open-File Report 76-606, 92 p.

  • Deposit

    Cobb, E.H., 1976, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Dillingham, Sleetmute, and Taylor Mountains quadrangles, Alaska: U.S. Geological Survey Open-File Report 76-606, 92 p.

Comments on the references

  • Primary Reference = Clark and others, 1970

General comments

Subject category Comment text
Deposit Model Name = Simple Sb deposits (Cox and Singer, 1986; model 27d)

Reporter information

Type Date Name Affiliation Comment
Reporter 30-DEC-2000 Travis L. Hudson Applied Geology