Unnamed (south of Finger Glacier)

Site Name

Primary: Unnamed (south of Finger Glacier)

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Commodity

Primary: Lead
Primary: Titanium
Secondary: Copper
Secondary: Tellurium
Secondary: Nickel
Secondary: Silver

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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

Model Name: Bushveld Fe-Ti-V

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Orebody

Not available

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Structure

Not available

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Alterations

Not available

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Rocks

Not available

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Analytical Data

Not available

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Materials

Ore: Altaite
Ore: Galena
Ore: Ilmenite

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Comments

Comment (Geology): Age = Tertiary.

Comment (Exploration): Status = Inactive

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

Comment (Reserve-Resource): Reserves = No reserves assigned, only minor concentration of ilmenite in 10 foot layer at Rossman's (1963) location number 43. Locality of number 41 is a mineralogic curiosity of unknown significance.

Comment (Workings): Workings / Exploration = Surface outcrops of a 10-foot thick layer at locality number 43 contain as much as 2.5 weight percent ilmenite (in four samples--Rossman, 1963, table 6). At nearby site number 41 (table 7) spectrographic analyses of heavy mineral concentrates from locality indicated 0.X percent copper and nickel, X.0 percent lead, and a trace of silver.

Comment (Deposit): Model Name = Bushveld Fe-Ti-V (Cox and Singer, 1986; model 3). Ilmenite cumulate segregations at Rossman's (1963) site 43; uncertain lode in layered mafic intrusion at locality number 41, also Rossman.

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

Comment (Geology): Geologic Description = The occurrence is in layered gabbro of the Crillon-La Perouse intrusion about one-half mile from its southwestern contact (Brew and others, 1978). The country rock at the contact is hornblende and biotite schist. Both schistosity and intrusive layering in this vicinity mainly strike northwest and dip 45-65 degrees northeast (Rossman, 1963).? Possibly two distinct deposit types are represented in the area. At Rossman's site number 43 cumulus(?) layers rich in ilmenite contain as much as 2.5 percent of ilmenite; at nearby site number 41, heavy mineral sulfide-rich(?) concentrates contained X.0 percent lead, 0.X percent copper and nickel, and 0.00X percent silver. Titanium was negligible at site 41. The mineralogy is uncertain, but at X.0 percent, lead should be present as a separate phase. Galena is possible, as is a lead telluride, altaite, which occurs in the Brady Glacier deposit (MF003).

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References

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

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