Unnamed (in Tatlawiksuk River basin)

Occurrence in Alaska, United States with commodities Silver, Copper

Geologic information

Identification information

Deposit ID 10307831
Record type Site
Current site name Unnamed (in Tatlawiksuk River basin)

Geographic coordinates

Geographic coordinates: -155.59487, 62.23244 (WGS84)
Relative position This unnamed occurrence is located in a small saddle along a southwest-northeast-trending spur overlooking a south-flowing tributary of the Tatlawiksuk River; it is at an elevation of 2,150 feet (655 m) in the NW1/4 sec. 28, T. 25 N., R. 34 W., of the Seward Meridian. The reporter visited the site in 1978; at station no. 78BT196.
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Geographic areas

Country State
United States Alaska


Commodity Importance
Silver Primary
Copper Secondary

Materials information

Materials Type of material
Pyrite Ore
Quartz Gangue

Mineral occurrence model information

Model code 85
USGS model code 22c
Deposit model name Polymetallic veins
Mark3 model number 46

Nearby scientific data

(1) -155.59487, 62.23244

Comments on the geologic information

  • Geologic Description = This unnamed occurrence is a pyrite-rich quartz-breccia zone within a N5E-trending, high-angle fault zone that juxtaposes quartz monzonite and thermally altered Kuskokwim Group rocks (Wilson and others, 1998). A pronounced fault zone is at least 15 meters thick and extends for 10 kilometers along strike. One grab sample of pyrite-rich gossan from the fault zone contained 10.1 grams/tonne silver and 142 ppm copper (T.K. Bundtzen, written communication, 1998).

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 = The unnamed occurrence was found by the reporter during geologic mapping conducted for the Alaska Division of Geological and Geophysical Surveys; and eventually published in Wilson and others (1998). One grab sample contained 10.1 grams/tonne silver and 142 ppm copper (T.K. Bundtzen, written communication, 1998).

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Alaska Resource Data File ARDF MG015

Bibliographic references

  • 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 = This description

General comments

Subject category Comment text
Deposit Model Name = Polymetallic vein (Cox and Singer, 1986; model 22c).

Reporter information

Type Date Name Affiliation Comment
Reporter 18-DEC-98 T.K. Bundtzen Pacific Rim Geological Consulting