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Unnamed (a tributary to Tatina River)

Occurrence in Alaska, United States with commodities Copper, Zinc, Lead
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Geologic information

Identification information

Deposit ID 10307874
Record type Site
Current site name Unnamed (a tributary to Tatina River)

Geographic coordinates

Geographic coordinates: -153.06083, 62.38849 (WGS84)
Relative position This unnamed occurrence is located in a steep, south-flowing tributary of the Tatina River at an elevation of 3,350 feet (1,021 m) in the NW1/4, T. 27 N., R. 20 W., of the Seward Meridian. The reporter visited the site in 1984; at station no. 84BT117.
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Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Copper Primary
Zinc Primary
Lead Secondary

Materials information

Materials Type of material
Chalcopyrite Ore
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) -153.06083, 62.38849
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Comments on the geologic information

  • Geologic Description = This unnamed occurrence is a low sulfide, quart-carbonate vein system that strikes east-west near the contact between the Upper Triassic to Lower Jurassic, Tatina River Volcanics and the Lower Cretaceous Kahiltna Flysch (Bundtzen, Harris, and Gilbert, 1997). The mineralized zone occurs in a well-defined shear zone subparallel to bedding; it continues for at least 140 meters, and varies from 15 centimeters to one meter thick. Principle sulfides include pyrite and minor to trace chalcopyrite disseminated throughout the quartz-carbonate vein. Two samples taken across the vein averaged 230 ppm zinc, 314 ppm copper, and 90 ppm lead.

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 reporter sampled the site in 1984. Two samples taken across the vein in separate locations averaged 230 ppm zinc, 314 ppm copper, and 90 ppm lead.

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Alaska Resource Data File ARDF MG077

Bibliographic references

  • Deposit

    Bundtzen, T.K., Harris, E.E., and Gilbert, W.G., 1997, Geologic Map of the eastern McGrath quadrangle, Alaska: Alaska Division of Geological and Geophysical Surveys Report of Investigations 97-14, 34 pages, one sheet, scale 1:125,000.

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 10-DEC-98 T.K. Bundtzen Pacific Rim Geological Consulting