Unnamed (near Cheeneetnuk River)

Occurrence in Alaska, United States with commodities Copper, Molybdenum, Zinc

Geologic information

Identification information

Deposit ID 10307833
Record type Site
Current site name Unnamed (near Cheeneetnuk River)

Geographic coordinates

Geographic coordinates: -155.23084, 62.03344 (WGS84)
Relative position This unnamed occurrence is located on a north-south ridgeline, 3.0 kilometers NW of Cheeneetnuk River, at an elevation of 2,500 feet (762 m) in the SE1/4 sec. 36, T. 23 N., R. 33 W., of the Seward Meridian. The location corresponds to map number 136 of Gilbert (1981); his station no. 77WG236. The reporter visited the site in 1989.
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Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Copper Primary
Molybdenum Secondary
Zinc Secondary

Materials information

Materials Type of material
Pyrite Ore
Axinite Gangue
Quartz Gangue

Mineral occurrence model information

Model code 72
USGS model code 19a
Deposit model name Polymetallic replacement
Mark3 model number 47

Nearby scientific data

(1) -155.23084, 62.03344

Comments on the geologic information

  • Geologic Description = This unnamed occurrence is a pyrite-rich gossan developed in Upper Paleozoic argillite of the Mystic subterrane near a thrusted contact with an overlying, Late Devonian shallow water limestone (Gilbert, 1981; Wilson and others, 1998). The pyritic gossan parallels the thrust contact and may mark a subsidiary thrust fault zone. The argillite host appears to be thermally upgraded to hornfels by a buried intrusive system; a Tertiary granite is exposed about 5 kilometers NE of the occurrence area. Platey axinite and quartz were found in two localities in the argillite. The extent of the site is unknown. One grab sample of the pyritic material contained 290 ppm copper, 150 ppm zinc, and 7 ppm molydenum (Gilbert, 1981).

Economic information

Economic information about the deposit and operations

Development status Occurrence

Comments on exploration

  • Status = Inactive

Mining district

District name McGrath

Comments on the workings information

  • Workings / Exploration = W.G. Gilbert sampled the mineralized zone during geologic mapping for the Alaska Division of Geological and Geophysical Surveys in 1977 (Gilbert, 1981). One grab sample of the pyritic material yielded 290 ppm copper, 150 ppm zinc, and 7 ppm molybdenum.

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Alaska Resource Data File ARDF MG017

Bibliographic references

  • Deposit

    Gilbert, W.G., 1981, Preliminary geologic map of the Cheeneetnuk River area, Alaska: Alaska Division of Geological and Geophysical Surveys Open-File Report 153, 19 pages, 2 sheets, 1:63,360 scale.

  • Deposit

    Wilson, F.H., Dover, J.H., Bradley, D.C., Weber, F.R., Bundtzen, T.K., and Haeussler, P.J., 1998, Geologic map of central (interior) Alaska: U.S. Geological Survey Open-File Report 98-133, 17 p., 2 sheetsm, scale 1:500,000.

Comments on the references

  • Primary Reference = Gilbert, 1981

General comments

Subject category Comment text
Deposit Model Name = Polymetallic replacement (?) (Cox and Singer, 1986; model 19a).

Reporter information

Type Date Name Affiliation Comment
Reporter 10-DEC-98 T.K. Bundtzen Pacific Rim Geological Consulting