Unnamed (near Tukgahgo Mountain)

The Unnamed (near Tukgahgo Mountain) is a copper, gold, and silver 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 (near Tukgahgo Mountain)

Commodity

Primary: Copper
Primary: Gold
Primary: Silver
Secondary: Platinum
Secondary: Palladium

Location

State: Alaska
District: Juneau (Skagway subdistrict)

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: Polymetallic veins

Orebody

Not available

Structure

Not available

Alterations

Not available

Rocks

Not available

Analytical Data

Not available

Materials

Ore: Pyrite
Ore: Molybdenite
Ore: Malachite
Ore: Chalcopyrite
Gangue: Quartz

Comments

Comment (Geology): Age = Mid-Cretaceous or younger based on the age of the Mount Kashagnak pluton that hosts the deposits (Redman and others, 1984).

Comment (Geology): Geologic Description = The following description is from Still and others (1991). The geology of the area consists of roof pendants of metabasalt and amphibolite surrounded by hornblende diorite, granodiorite and monzonite. Sporadic narrow and discontinuous quartz veins occur in the area, mostly near the northwesterly trending, Tukgahgo Mountain fault. A sample collected across a vein with visible molybdenite contained 1,240 ppm molybdenum. Seven samples analyzed for platinum and palladium contained from nil to 0.09 ppm platinum and from 0.004 to 0.07 ppm palladium. The source of the platinum and palladium may be ultramafic rocks that crop out several miles to the southeast of this area. Descriptions of samples collected from this area by Gilbert and others (1991) include numerous references to quartz veins with pyrite; chalcopyrite, malachite, and molybdenite are also mentioned in some descriptions. Samples contained up to 0.824 ppm gold, 2.70 ppm silver, and 2,140 ppm copper. The intrusive rocks are part of the Mount Kashagnak pluton (Redman and others 1984). It's mid-Cretaceous age establishes a maximum age for the mineralization.

Comment (Exploration): Status = Probably inactive

Comment (Deposit): Other Comments = the Alaska, Chilkat Bald Eagle Preserve is less than 1 mile to the west of these occurrences.

Comment (Deposit): Model Name = Polymetallic veins (?) (Cox and Singer, 1986; model 22c?).

Comment (Reference): Primary Reference = Gilbert and others, 1991

References

Reference (Deposit): Still, J.C., Hoekzema, R.B., Bundtzen, T.K., Gilbert, W.G., Wier, K.R., Burns, L.E., and Fechner, S.A., 1991, Economic geology of Haines-Klukwan-Porcupine area, southeastern Alaska: Alaska Division of Geological and Geophysical Surveys Report of Investigations 91-4, 156 p., 5 sheets, scale 1:63,360.

Reference (Deposit): Still, J.C., 1991, Bureau of Mines mineral investigations in the Juneau mining district, Alaska, 1984 - 1988, v. 2, Detailed mine, prospect, and mineral occurrence descriptions, section A, Haines-Klukwan-Porcupine subarea: U.S. Bureau of Mines of Mines Special Publication, 214 p.

Reference (Deposit): Redman, E.C., Retherford, R.M., and Hickok, B.D., 1984, Geology and geochemistry of the Skagway B-2 Quadrangle, southeastern Alaska: Alaska Division of Geological and Geophysical Surveys Report of Investigations 84-31, 34 p., 4 sheets, scale 1:40,000.

Reference (Deposit): Gilbert, W.G., Still, J.C., Burns, L.E., Wier, K.R., and Redman, E.C., 1991, Geochemistry of Haines-Klukwan-Porcupine area, southeastern Alaska: Alaska Division of Geological and Geophysical Surveys Report of Investigations 91-5, 1 sheet, scale 1:63,360, 75 p.

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