Unnamed (north wall of Shiels Glacier)

The Unnamed (north wall of Shiels Glacier) is a zinc and lead mine located in Alaska.

About the MRDS Data:

All mine locations were obtained from the USGS Mineral Resources Data System. The locations and other information in this database have not been verified for accuracy. It should be assumed that all mines are on private property.

Mine Info

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Site Name

Primary: Unnamed (north wall of Shiels Glacier)

Commodity

Primary: Zinc
Primary: Lead
Secondary: Silver
Secondary: Gold

Location

State: Alaska
District: Copper River

Land Status

Not available

Holdings

Not available

Workings

Not available

Ownership

Not available

Production

Not available

Deposit

Record Type: Site
Operation Category: Occurrence
Operation Type: Unknown
Years of Production:
Organization:
Significant:

Physiography

Not available

Mineral Deposit Model

Model Name: Massive sulfide, Cyprus
Model Name: Low-sulfide Au-quartz vein

Orebody

Not available

Structure

Not available

Alterations

Not available

Rocks

Not available

Analytical Data

Not available

Materials

Ore: Sphalerite
Ore: Pyrrhotite
Ore: Pyrite
Ore: Galena

Comments

Comment (Exploration): Status = Inactive

Comment (Reference): Primary Reference = Jansons and others, 1984

Comment (Deposit): Model Name = Cyprus massive sulfide (Cox and Singer, 1986; model 24a) and/or Chugach-type low-sulfide gold-quartz veins (Bliss, 1992; model 36a.1)

Comment (Deposit): Other Comments = Chugach Alaska Corporation, Anchorage, Alaska has control of these lands.

Comment (Geology): Geologic Description = The country rocks at this occurrence are metavolcanic rocks (greenstone) and metasedimentary rocks of the Upper Cretaceous Valdez Group. These rocks are part of a 65-mile-long belt of volcanic rocks having potential for volcanogenic massive sulfide deposits, extending to the Copper River (Nelson and others, 1984; 1985). The metavolcanic rocks contain disseminations and lenses of pyrite and pyrrhotite, and disseminations of galena and sphalerite. Two grab samples from talus contained 0.03 ppm and 5.0 ppm Au, 34 ppm and 0.92% Zn, 47 ppm and 0.20% Pb, and 5.4 ppm and 11.2 ppm Ag (Jansons and others, 1984). Pan-concentrate samples from the area contained 1000 ppm Au, 1000 ppm Ag, 1% As, and 3000 ppm Pb (Goldfarb and others, 1984). Kodosky and Teller (1989) report that the average gold value for pan-concentrate samples in this drainage is 5791 ppb. The average assays of two rock samples are 858 ppb and 1348 ppb Au, and 1750 ppm and 1038 ppm Pb.

Comment (Geology): Age = Late Cretaceous based on the age of the host rocks.

Comment (Workings): Workings / Exploration = Site was sampled as part of a U.S. Bureau of Mines and U.S.G.S. mineral resource assessment of the Chugach National Forest (Jansons and others, 1984; Nelson and others, 1984). Site was also examined by private industry in 1988 (Kodosky and Teller,1989). Kodosky and Teller (1989) concluded that the drainage area had a very high probability of containing a gold-bearing quartz system. Their average gold value for pan-concentrate samples in this drainage is 5791 ppb. The average assays of two rock samples are 858 ppb and 1348 ppb Au, and 1750 ppm and 1038 ppm Pb.

References

Reference (Deposit): Nelson, S.W., Miller, M.L., Barnes, D.F., Dumoulin, J.A., Goldfarb, R.J., Koski, R.A., Mull, C.G., Pickthorn, W.J., Jansons, Uldis, Hoekzema, R.B., Kurtak, J.M., and Fechner, S.A., 1984, Mineral resource potential of the Chugach National Forest, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-1645-A, 24 p., 1 plate, scale 1:250,000.

Reference (Deposit): Jansons, Uldis, Hoekzema, R.B., Kurtak, J.M., and Fechner, S.A., 1984, Mineral occurrences in the Chugach National Forest, Southcentral Alaska: U.S. Bureau of Mines Open-File Report 5-84, 218 p., 2 sheets, scale 1:250,000.

Reference (Deposit): Kodosky, Larry, and Teller, Steve, 1989, Economic mineral assessment of Chugach Alaska Corporation properties and selected land in the Copper, Bremner, and Tasnuna River area: unpublished report prepared for Chugach Alaska Corporation, Anchorage, Alaska, 116 p.

Reference (Deposit): Goldfarb, R.J., Nelson, S.W., Dumoulin, J.D., Hoffman, J.D., Trip, R.B., Smaglik, Suzanne, and Folger, Peter, 1984, Data report and statistical summary for samples of moraine and stream-sediment, nonmagnetic, heavy-mineral concentrates, and rock samples from the Chugach National Forest, Alaska: U.S. Geological Survey Open-File Report 84-355, 29 p. (plus unnumbered tables).

Reference (Deposit): Nelson, S.W., Dumoulin, J. A., and Miller, M.L., 1985, Geologic map of the Chugach National Forest, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-1645-B, 16 p., 1 sheet, scale 1:250,000.

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