Unnamed (north wall of South Crillon Glacier)

The Unnamed (north wall of South Crillon Glacier) is a copper and nickel 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 South Crillon Glacier)

Commodity

Primary: Copper
Primary: Nickel
Secondary: Cobalt
Secondary: Iron
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

Alteration Type: L
Alteration Text: Conspicuous iron-stained zones.

Rocks

Not available

Analytical Data

Not available

Materials

Ore: Chalcopyrite
Ore: Magnetite
Ore: Pentlandite

Comments

Comment (Geology): Geologic Description = The copper-nickel occurrence is in the Crillon-LaPerouse layered mafic-ultramafic pluton, near its western contact. The pluton is of Tertiary age; it was intruded into biotite and hornblende schist (Brew and others, 1978). The schist units are in the upper Chugach terrane of Berg and others (1972). ? At the occurrence, iron-stained zones as much as 20 feet thick and traceable visually for thousands of feet occur in layered gabbro. The zones appear to cut the layering of the gabbro at a small angle and are proposed to be shear zones (Kimball and others, 1978, p. C101-102). At one accessible location a 6-8 foot thick heavily iron stained layer was mapped and sampled over a strike length of 120 feet. The zone contains disseminated chalcopyrite and pyrrhotite. Within this zone, a thin (0.6) foot lens about 12 feet long contains semimassive sulfide concentrations of chalcopyrite, pyrrhotite and pentlandite. A sample from the zone contained 3000 ppm copper, 2500 ppm nickel, and 700 ppm cobalt. Gold was detected in two samples; the select sample contains greater than 20 percent iron (Kimball and others, 1978, p. C102 and figures C32 and C33).

Comment (Deposit): Model Name = Sulfide segregations in shear zones that cut layered gabbro.

Comment (Deposit): Other Comments = the area is near the contact of the Crillon-La Perouse stock of layered gabbro in Glacier Bay National Park and Monument. The area is extremely rugged. Other deposits could exist nearby.? the site is in Glacier Bay National Park and Preserve.

Comment (Geology): Age = Tertiary.

Comment (Exploration): Status = Inactive

Comment (Workings): Workings / Exploration = The occurrences are surface exposures with no workings. The U.S. Bureau of Mines (Kimball and others, 1978, p. C101-102, figs. C32 and 33) found as much as 0.24 percent copper, 700 ppm nickel, 150 ppm cobalt, and 0.10 ppm gold in the mineralized zone which is as much as 8 feet thick. Mineralized sheared gabbro contains as much as 0.3 percent copper, 2500 ppm nickel and 700 ppm cobalt in a narrow (0.6 foot) high grade lens within the mineralized zone.

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

References

Reference (Deposit): Cobb, E.H., 1972, Placer deposits of Alaska: U.S. Geological Survey Open-File Report 508.

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.

Reference (Deposit): Rossman, Darwin, 1963, Geology and petrology of two stocks of layered gabbro in the Fairweather Range, Alaska: U.S. Geological Survey Bulletin 1121-F, p. F1-F50.

Reference (Deposit): Cobb, E.H., 1972, Metallic mineral resources of the Mount Fairweather quadrangle, AK: U.S. Geological Survey Miscellaneous Field Study Map MF-436, 1 sheet, scale 1:250,000.

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): 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): 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.

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