Unnamed (northwest of Mt. Marchainville)

The Unnamed (northwest of Mt. Marchainville) 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 (northwest of Mt. Marchainville)

Commodity

Primary: Iron
Primary: Titanium
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: 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

Alteration Type: L
Alteration Text: Local iron-and copper-(malachite) staining.

Rocks

Not available

Analytical Data

Not available

Materials

Ore: Malachite
Ore: Chalcopyrite
Ore: Ilmenite

Comments

Comment (Deposit): Model Name = Possibly Bushveld Fe-Ti-V (Cox and Singer, 1986; model 3). Magmatic segregation of ilmenite in layered mafic-ultramafic intrusion. The mafic intrusion is synorogenic (Foley and others, 1997).

Comment (Deposit): Other Comments = Chugach terrane. The ilmenite locality and the nearby copper-stained sites are in Glacier Bay National Park and Preserve.

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

Comment (Reserve-Resource): Reserves = Possibly extensive deposits are suggested by the thickness (50-feet) and by several nearby ilmenite-rich occurrences.

Comment (Workings): Workings / Exploration = No workings, surface outcrop only.

Comment (Exploration): Status = Inactive

Comment (Geology): Geologic Description = The occurrence is within the Fairweather terrane of Brew and others (1978). It is in the southwest part of the Crillon-LaPerouse mafic-ultramafic body which is intruded into biotite and hornblende schist of the upper Chugach terrane of Berg and others (1972). ? At the occurrence, an ilmenite-rich layer in gabbro is approximately 50-feet thick. Its strike length is uncertain because of the extremely rough topography. Rossman (1963) determined X0.0 percent titanium by spectrophic analyses (sample 52A Rm g 40). The sample also contained X0.+ percent iron, but only 0.0X percent of copper, cobalt, or nickel. Ilmenite determined by weight in mineral separates ranged from 5 to 11.4 weight percent. ? A nearby copper (malachite-stained) occurrence is near or at the contact of the intrusion; possibly the occurrence represents oxidized cupriferous amphibolite schist at the contact.

Comment (Geology): Age = Tertiary.

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): 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): 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): Cox, D.P., and Singer, D.A., 1986, Mineral deposit models: U.S. Geological Survey Bulletin 1693, 379 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): 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.

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