Unnamed (DeLangle Mountain)

The Unnamed (DeLangle Mountain) is a iron and titanium 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 (DeLangle Mountain)

Commodity

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

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: Prospect
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: Ilmenite
Ore: Magnetite
Ore: Pyrrhotite

Comments

Comment (Exploration): Status = Inactive

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

Comment (Workings): Workings / Exploration = A few claims are reported to have been staked on the south part of DeLangle Mountain, but there are no workings or evidence of mine activity. An occurrence chip-sampled by Kimball and others (1978, p. C120) contained greater than 10 percent iron, greater than 1 percent titanium and 150-500 ppm copper. The samples ranged from18 to 40 feet in length.? Mark-Anthony (1977) reported samples from the head of Boussole Bay to contain as much as 64 percent iron and 0.28 percent nickel.

Comment (Geology): Geologic Description = The mineralized sites are in the Astrolobe-DeLangle mafic stock, the southernmost layered mafic pluton exposed in the rugged Fairweather Range of Glacier Bay National Park and Preserve (Brew and others, 1978). The magmatic oxide minerals occur in a sub-horizontal hornblende-plagioclase pegmatite body that is approximately 100 feet wide and 20 feet thick. The body crops out discontinuously for 1,000 feet in gabbro near the northern contact of the Astrolobe-DeLangle layered mafic stock. Hornblende forms crystals to 1 foot in length in the pegmatitic phase. Segregations of magnetite less than 0.2 inch (5 mm) long are concentrated near larger hornblende and plagioclase crystals (Kimball and others, 1978, p. C120). The magnetite-rich body produces an extreme magnetic deviation.? Four chip samples, ranging from 18 to 40 feet in length, across the pegmatite body contained more than 10 percent iron and more than 1 percent titanium. Maximum copper content was 500 ppm. ? At Boussole Bay, about one mile south of the pegmatite occurrence, a two-foot-wide band exposed over 225 feet contained 64 percent iron, 20 percent titanium, and 0.28 percent nickel (Kimball and others, 1978, p. C122-123). At this location, Mark-Anthony (1977) reported that an intrusive exposed over an area of approximately 1500 x 4000 feet contains about 10 percent iron.

Comment (Deposit): Other Comments = Chugach terrane. The sites are in Glacier Bay National Park and Preserve.

Comment (Geology): Age = Tertiary.

Comment (Deposit): Model Name = Cumulus layered mafic intrusion with iron-titanium enriched hornblende-plagioclase pegmatites (segregations), possibly localized near the contact of the Astolobe-DeLangle synorogenic intrusion with schistose rocks of the Chugach terrane (Foley and others, 1997; Berg and others, 1972).

References

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): Mark-Anthony, Leo, 1977, Maps and notes on investigations in Glacier Bay, 1958-1960. (Unpublished material available at U.S. Bureau of Land Management library, Juneau, Alaska).

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): 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): 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.

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