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Unnamed (southeast of upper Finger Glacier)

Occurrence in Alaska, United States with commodities Iron, Titanium, Copper, Lead, Tin
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Geologic information

Identification information

Deposit ID 10002232
MRDS ID A013134
Record type Site
Current site name Unnamed (southeast of upper Finger Glacier)

Geographic coordinates

Geographic coordinates: -137.07016, 58.50165 (WGS84)
Relative position The occurrence is about 4.2 miles northwest of Mt. Marchainville on a ridge southeast of upper Finger Glacier at an elevation of about 6000 feet. The location is estimated from the location of sample number 44 of Rossman (1963). It is approximately correct based on the 6000-foot elevation; by latitude and longitude, the location is in the adjacent B-4 quadrangle. It is probably accurate to about 0.25 mile. The location in Kimball and others (1978) is uncertain.
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Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Iron Primary
Titanium Primary
Copper Secondary
Lead Secondary
Tin Secondary

Comments on the commodity information

  • Ore Material = unknown sulfide phases
  • Ore Material = unknown sulfide phases

Materials information

Materials Type of material
Ilmenite Ore
Magnetite 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-Laperouse Stock
    Rock description Crillon-Laperouse Stock
  • Host or associated Host
    Rock type Plutonic Rock > Mafic Intrusive Rock > Gabbro

Nearby scientific data

(1) -137.07016, 58.50165
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Comments on the geologic information

  • Geologic Description = The ilmenite-magnetite occurrence at Rossman's (1963, B 1121-F) location number 44 is within and about 1.4 miles from the southwest contact of the Crillon-LaPerouse layered mafic-ultramafic intrusion (Brew and others, 1978). Layering in the stock near this locality strikes northwest and dips moderately steeply to the northeast. ? At the locality, ilmenite and magnetite are concentrated in cumulus layers. Analysis of a heavy-mineral concentrate (Rossman, 1963, table 7) by semiquantitative spectrographic methods found X0.0+ percent iron and X.0 percent titanium. Heavy-mineral concentrates also contained 0.X percent each of copper, lead, and tin and 0.0X percent of cobalt and nickel. The concentrations of the trace metals are sufficiently low that they do not prove separate mineral phases for any of the trace metals.
  • 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 projected. Thickness and horizontal continuity information lacking.

Comments on the workings information

  • Workings / Exploration = Surface outcrops only; no development.

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS A013134
USGS Alaska Resource Data File ARDF MF009

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.

  • 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.

Comments on the references

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

General comments

Subject category Comment text
Deposit Model Name = Possibly Bushveld Fe-Ti-V (Cox and Singer, 1986; model 3). Ilmenite and magnetite enriched in cumulus layers of a synorogenic (Foley and others, 1997) layered mafic-ultramafic stock.
Deposit Other Comments = Chugach terrane. The site is in Glacier Bay National Park and Preserve.

Reporter information

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