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Unnamed (south of Finger Glacier)

Occurrence in Alaska, United States with commodities Lead, Titanium, Silver, Copper, Nickel, Tellurium
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Geologic information

Identification information

Deposit ID 10002231
MRDS ID A013133
Record type Site
Current site name Unnamed (south of Finger Glacier)

Geographic coordinates

Geographic coordinates: -137.09099, 58.4936 (WGS84)
Relative position The occurrence is at 4100-foot elevation about 3.9 miles northwest of Mt. Marchainville and on the south side of the head of Finger Glacier. The location is accurate to about 0.1 mile based on transposition of sample number 43 of Rossman (1963, B 1121-F) to the 1961 edition of the Mt. Fairweather B-4 quadrangle. Location number 41, also Rossman (1963), is about 0.1 mile southwest of number 43. The location is essentially the same as number 12 (p. C111) of Kimball and others (1978) shown, incorrectly, as their location 13 on plate III.
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Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Lead Primary
Titanium Primary
Silver Secondary
Copper Secondary
Nickel Secondary
Tellurium Secondary

Materials information

Materials Type of material
Altaite Ore
Galena Ore
Ilmenite Ore

Mineral occurrence model information

Model code 5
USGS model code 3
Deposit model name Bushveld Fe-Ti-V

Host and associated rocks

  • Host or associated Associated
    Rock type Plutonic Rock > Mafic Intrusive Rock > Gabbro
    Rock unit name Crillon-La Perouse Stock
    Rock description Crillon-La Perouse Stock
  • Host or associated Host
    Rock type Plutonic Rock > Mafic Intrusive Rock > Gabbro

Nearby scientific data

(1) -137.09099, 58.4936
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Comments on the geologic information

  • 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).
  • Age = Tertiary.

Economic information

Economic information about the deposit and operations

Development status Occurrence
Commodity type Metallic

Comments on exploration

  • Status = Inactive

Mining district

District name Yakutat

Comments on the reserve resource information

  • 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.

Comments on the workings information

  • 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.

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS A013133
USGS Alaska Resource Data File ARDF MF008

Bibliographic references

  • 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.

  • 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.

  • 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.

  • Deposit

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

Comments on the references

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

General comments

Subject category Comment text
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.
Deposit Other Comments = Chugach terrane. The sites are in Glacier Bay National Park and Preserve.

Reporter information

Type Date Name Affiliation Comment
Reporter 05-APR-99 Hawley, C.C. Hawley Resource Group