Unnamed (north of Mt. Marchainville)

Site Name

Primary: Unnamed (north of Mt. Marchainville)

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Commodity

Primary: Titanium
Primary: Iron
Secondary: Nickel
Secondary: Copper

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Location

State: Alaska
District: Yakutat

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Land Status

Not available

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Holdings

Not available

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Workings

Not available

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Ownership

Not available

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Production

Not available

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Deposit

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

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Physiography

Not available

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Mineral Deposit Model

Not available

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Orebody

Not available

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Structure

Not available

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Alterations

Alteration Type: L
Alteration Text: Conspicuous secondary iron-staining.

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Rocks

Not available

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Analytical Data

Not available

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Materials

Ore: Pyrrhotite
Ore: Magnetite
Ore: Ilmenite
Ore: Chalcopyrite

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Comments

Comment (Reference): Primary Reference = MacKevett and others, 1971

Comment (Workings): Workings / Exploration = Surface exposures only; knowledge is partly based on aircraft fly-by because of the extremely rough topography.

Comment (Geology): Age = Tertiary.

Comment (Geology): Geologic Description = Ilmenite and magnetite, accompanied by subordinate chalcopyrite and pyrrhotite, occur in heavily iron-stained masses near the south contact of the Crillon-LaPerouse layered mafic-ultramafic intrusion (Brew and others, 1978). The layered intrusive was emplaced in rocks of the Chugach terrane (Berg and others, 1972). The first reports of the occurrences were by Rossman (1963, B 1121-F); further reports were made by MacKevett and others (1971, p. 72-73) and Kimball and others (1978, p. C112).

Comment (Deposit): Other Comments = the occurrences are in extremely rugged country in the south part of the Crillon-LaPerouse intrusion in Glacier Bay National Park and Preserve.

Comment (Deposit): Model Name = Heavy-mineral segregations near basal contact of synorogenic layered mafic intrusive of Tertiary age (Foley and others, 1997).

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References

Reference (Deposit): Foley, J.Y., Light, T.D., Nelson, S.W., and Harris, R.A., 1997, Mineral occurrences associated with mafic-ultramafic and related alkaline complexes in Alaska: Economic Geology, Monograph 9, p. 396-449.

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): 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): 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): 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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