Unnamed (Astrolabe Peninsula)

The Unnamed (Astrolabe Peninsula) is a titanium and iron 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 (Astrolabe Peninsula)

Commodity

Primary: Titanium
Primary: Iron

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

Model Name: Bushveld Fe-Ti-V

Orebody

Not available

Structure

Not available

Alterations

Not available

Rocks

Not available

Analytical Data

Not available

Materials

Ore: Ilmenite
Ore: Magnetite

Comments

Comment (Geology): Age = Tertiary.

Comment (Geology): Geologic Description = These iron-titanium occurrences are in the Astralobe-DeLangle stock, the southernmost of four layered mafic intrusives in the Fairweather Range in Glacier Bay National Park and Preserve (Brew and others, 1978). The layered gabbro is mainly composed of plagioclase (An content of 55-70 percent), monoclinic and orthorhombic pyroxene, and olivine. Magnetite and ilmenite make up as much as 20 percent of some layers of the stock, and there are accessory amounts of apatite, sulfides, and graphite (Rossman, 1963, B 1121-F, p. F23-25, F44-45). Chemical analyses of four rocks typical of the stock are also given by Rossman (1963, table 2). Approximately 2000 feet of the stock is exposed without significant compositional variation (Rossman, 1963, p. F32).? the mineral occurrences exposed near the south peak of the Astralobe Peninsula are approximately central in the stock, assuming that the stock goes offshore at least as far south as Sugarloaf Island. Rossman (1963, p. F44-45) proposed that the magnetite-ilmenite rich layers were at the top or side of the stock, and that they occurred in approximately 1000 stratigraphic feet of the stock and extended through the mountain.? the deposit in the vicinity of samples of Rossman's (1963) 38-39 series contain as much as 12.5 weight percent ilmenite and 14 percent magnetite, as determined in mineral separates. The average content of 10 samples of the 38 series was approximately 8.3 weight percent magnetite and 3.6 weight percent ilmenite. Rossman believed that the deposit was very large.

Comment (Deposit): Model Name = Similar to Bushveld Fe-Ti-V (Cox and Singer, 1986; model 3). Magmatic segregations in synorogenic layered mafic igneous intrusive of Tertiary age (Foley and others. 1997).

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

Comment (Workings): Workings / Exploration = There are no mine workings, all data are from samples collected from natural exposures. At Rossman's (1963) location 38, magnetite averages 8.3 percent and ilmenite (nine of ten samples) averages 3.6 percent. The rock at nearby sample site 34 contains as much as 13.5 percent magnetite; two of four samples average 2 percent ilmenite. Maximum magnetite content at the 34 site is 22 percent; maximum ilmenite is 12.5 percent (Rossman,1963, table 8, p. F45).

Comment (Reserve-Resource): Reserves = A resource exists based on Rossman's (1963) estimate of a 1000-foot thickness of the layered gabbro. Based on 1000 x 1000 x 500-foot (depth) and 10 cu-ft /ton , there is, conservatively, about 50 million tons of iron-titanium enriched gabbro at the upper site (samples in the 38-39 series of Rossman).

Comment (Reference): Primary Reference = Rossman, 1963 (B 1121-F)

Comment (Exploration): Status = Inactive

References

Reference (Deposit): Cobb, E.H., 1972, Metallic mineral resources map 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): 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): 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): 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.

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