Unnamed (east of upper Tunulik River)

The Unnamed (east of upper Tunulik River) is a copper and gold 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

Satelite View

MRDS mine locations are often very general, and in some cases are incorrect. Some mine remains have been covered or removed by modern industrial activity or by development of things like housing. The satellite view offers a quick glimpse as to whether the MRDS location corresponds to visible mine remains.

Site Name

Primary: Unnamed (east of upper Tunulik River)

Commodity

Primary: Copper
Primary: Gold

Location

State: Alaska
District: Goodnews Bay

Land Status

Not available

Holdings

Not available

Workings

Not available

Ownership

Not available

Production

Not available

Deposit

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

Physiography

Not available

Mineral Deposit Model

Not available

Orebody

Not available

Structure

Not available

Alterations

Not available

Rocks

Role: Host
Age Type: Host Rock
Age Young: Eocene
Age Old: Jurassic

Analytical Data

Not available

Materials

Ore: Gold
Ore: Chalcopyrite
Gangue: Quartz
Gangue: Orthoclase

Comments

Comment (Geology): Age = Not known. The age of the host intrusive rock is probably Jurassic or Late Cretaceous/Early Tertiary, the age of other intrusive rocks in the region (Hoare and Coonrad, 1978).

Comment (Reference): Primary Reference = Fechner, 1988

Comment (Workings): Workings / Exploration = Reconnaissance surface observations and sampling have been completed in the prospect area (Calista Corporation, unpublished data).

Comment (Geology): Geologic Description = A composite mafic to felsic pluton intrudes Paleozoic to Mesozoic sedimentary and volcanic rocks in this area (Hoare and Coonrad, 1978). Surface observations completed for Calista Corporation (unpublished data) identified diorite or gabbro with podlike segregations (?) containing 1 to 2 percent chalcopyrite (Fechner, 1988, p. 63). A local quartz-orthoclase vein, 2 inches wide, assayed 3 ppm Au and 3,000 ppm As. The stream sediment from a small creek flowing southwest to the Tunulik River from the prospect contained 4.1 ppm Au; pan concentrate from this location contained gold flakes.

Comment (Deposit): Model Name = Vein and segregations(?) in mafic rocks

References

Reference (Deposit): Kilburn, J.E., Goldfarb, R.J., Griscom, Andrew, and Box, S E., 1993, Map showing metallic mineral resource potential in the Goodnews Bay, Hagemeister Island, and Nushagak Bay quadrangles, southwest Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-2228, 4 sheets, scale 1:250,000.

Reference (Deposit): Hoare, J.M., and Coonrad, W.L., 1978, Geologic map of the Goodnews and Hagemeister Island quadrangles region, southwestern Alaska: U.S. Geological Survey Open-File Report 78-9-B, two sheets, scale 1:250,000.

Reference (Deposit): Fechner, S.A., 1988, Bureau of Mines mineral investigation of the Goodnews Bay mining district, Alaska: U.S. Bureau of Mines Open-File Report 1-88, 230 p.

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