Unnamed

The Unnamed is a copper 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

Commodity

Primary: Copper
Secondary: Silver

Location

State: Alaska
District: Aleutians

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: Porphyry Cu

Orebody

Not available

Structure

Not available

Alterations

Alteration Type: L
Alteration Text: Propylitic alteration having the assemblages pyrite-chlorite +/- epidote and magnetite-epidote +/- chlorite. Christie (1974) reported leaching is weakly developed. Intensely bleached rocks containing up to 10 percent pyrite are locally present. (Possible sericitic alteration?).

Rocks

Not available

Analytical Data

Not available

Materials

Ore: Chalcopyrite
Ore: Pyrite
Gangue: Magnetite

Comments

Comment (Exploration): Status = Inactive

Comment (Workings): Workings / Exploration = Brief reconnaissance mapping and a few soil/silt samples showed low level anomalies, most significant was 1.3 to 1.4 ppm silver.

Comment (Geology): Geologic Description = Color anomaly 6,000 ft (1800 m) by 2,000 ft (600 m) occurs in volcanic rocks of the Unalaska Formation (see Drewes and others, 1961). In the east half of the area, scattered, intensely altered zones of pyrite-chlorite +/- epidote are separated by zones of moderate alteration containing minor pyrite and abundant fracture-controlled magnetite and epidote. According to Christie (1974), the only possible intrusive rocks are intensely bleached and contain 3 to 10 percent pyrite. Chalcopyrite is minor and sporadic in occurrence, where present it occurs as fracture fillings and disseminated in both weakly and intensely altered rock. Where chalcopyrite does occur, grade is less than 200 ppm. Fracturing is weak to moderately developed.

Comment (Reference): Primary Reference = Christie, 1974

Comment (Deposit): Other Comments = See UN005, Sedanka, which occurs to the northwest of this occurrence.

Comment (Deposit): Model Name = Copper porphyry?

Comment (Geology): Age = Miocene or younger

References

Reference (Deposit): Drewes, Harold, Fraser, G.D., Snyder, G.L., and Barnett, H.F., Jr., 1961, Geology of Unalaska Island and adjacent insular shelf, Aleutian Islands, Alaska: U.S. Geological Survey Bulletin 1028-S, p. 583-676.

Reference (Deposit): Christie, J.S., 1974, Aleut-Quintana-Duval 1974 joint venture, final report: Unpublished Quintana Minerals Corporation report, 24 p., 3 appendices, 2 maps. (Report held by the Aleut Corporation, Anchorage, Alaska.)

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