Unnamed (near Cascade Glacier)

The Unnamed (near Cascade Glacier) 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 (near Cascade Glacier)

Commodity

Primary: Copper
Secondary: Silver
Secondary: Gold

Location

State: Alaska
District: Yakutat

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

Not available

Orebody

Not available

Structure

Not available

Alterations

Not available

Rocks

Not available

Analytical Data

Not available

Materials

Ore: Chalcopyrite
Ore: Pyrite
Ore: Pyrrhotite

Comments

Comment (Geology): Age = Tertiary.

Comment (Deposit): Other Comments = the area is extremely rugged; higher grade units could exist within the mineralized schist unit, an element of the Chugach terrane. The area is in Glacier Bay National Park and Preserve.

Comment (Geology): Geologic Description = Amphibolite schist is extensively exposed in the Fairweather terrane of Brew and others (1978). The rocks probably are in the Chugach terrane of Berg and others (1972).? Amphibolite schist above Cascade Glacier is extensively iron-stained. The stain is developed on sulfidized (pyrite and pyrrhotite(?)) layers that crop out from about 3400 to 3600 feet elevation and are traceable along strike for 100s of feet. A float sample contained 1000 ppm copper. Samples representative of the schist unit contained elevated background amounts of copper--as much as 240 ppm (Kimball and others, 1978, p.C125). A heavily stained sulfide-rich lens about 0.4 feet thick and 10 feet long contained 800 ppm copper, 0.15 ppm gold and 7 ppm silver. (About 0.03 weight percent chalcopyrite is equivalent to 1000 ppm copper and chalcopyrite is the most likely copper phase in the unit.)? Kimball and others (1978) proposed that the site should be investigated more thoroughly. Iron-staining is widespread in the schistose units, and copper has been reported elsewhere in schist, as from the moraine coming out of North Crillon Glacier, where amphibolite-quartz schist fragments are stained with copper carbonates (MacKevett and others, 1971, p. 53 after Kennedy and Walton, 1946, p. 71). (The North Crillon location is 86 of plate 1 of MacKevett and others, 1971).

Comment (Workings): Workings / Exploration = There are no workings. Kimball and others (1978) followed up a USGS collected float sample which contained 1000 ppm copper. Select samples of the iron-stained schist contained as much as 7 ppm silver, 0.15 ppm gold, and 800 ppm copper.

Comment (Deposit): Model Name = Mineralized amphibolite schist.

Comment (Exploration): Status = Inactive

Comment (Reference): Primary Reference = Kimball and others, 1978

References

Reference (Deposit): Kennedy, G.C. and Walton, M.S., Jr., 1946, Geology and associated mineral deposits of some ultrabasic rocks in southeastern Alaska: U.S. Geological Survey Bulletin 947-D, p. 65-84.

Reference (Deposit): MacKevett, E.M., Jr., Brew, D.A., Hawley, C.C., Huff, L.C., and Smith, J.G., 1971, Mineral resources of Glacier Bay National Monument, Alaska: U.S. Geological Survey Professional Paper 632, 90 p., 12 plates, scale 1:250,000.

Reference (Deposit): Berg, H.C., Jones, D. L., and Richter, D. H., 1972, Gravina-Nutzotin Belt-tectonic significance of an Upper Mesozoic sedimentary and volcanic sequence in southern and southeastern Alaska: U.S. Geological Survey Professional Paper 800-D, p. D1-D24.

Reference (Deposit): Brew, D.A., Johnson, B.R., Grybeck, D., Griscom, A., Barnes, D.F., Kimball, A.L., Still, J.C., and Rataj, J.L., 1978, Mineral resources of the Glacier Bay National Monument Wilderness Study Area, Alaska: U.S. Geological Survey Open-File Report 78-494, 670 p.

Reference (Deposit): Kimball, A.L., Still, J.C., and Rataj, J.L., 1978, Mineral resources, in Brew, D. A., and others, Mineral resources of the Glacier Bay National Monument wilderness study area, Alaska: U.S. Geological Survey Open-File Report 78-494, p. C1-C375.

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