Unnamed (upper North Crillon Glacier)

Occurrence in Alaska, United States with commodities Iron, Titanium, Copper

Geologic information

Identification information

Deposit ID 10002224
MRDS ID A013126
Record type Site
Current site name Unnamed (upper North Crillon Glacier)
Related records 10112920

Geographic coordinates

Geographic coordinates: -137.28601, 58.67165 (WGS84)
Relative position The occurrence is on a northwest-facing slope, at an approximate elevation of 3500 feet adjacent to North Crillon Clacier, SW 1/4SW 1/4, section 11, T. 37 S., R. 40 E., of the Copper River Meridian. The location is near sample 38b of Rossman (1963, B 1121-F), location number 6 of Kimball and others (1978), location number 79 of MacKevett and others (1971), and at or near location number 4 of Cobb (1972 MF-436). Kennedy and Walton (1946) reported copper minerals near here. The location is accurate within 0.1 mile.
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Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Iron Primary
Titanium Primary
Copper Secondary

Materials information

Materials Type of material
Chalcopyrite Ore
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) -137.28601, 58.67165

Comments on the geologic information

  • Geologic Description = The occurrence is in the northwestern part of the Crillon-LaPerouse layered mafic complex (Brew and others, 1978). It is probably about 0.4 miles from the contact of the intrusive, which, in this area, is concealed by the glacier. The occurrence, of heavily disseminated ilmenite in layered mafic rock, is marked by an extensive iron-stained zone. Samples collected by Rossman (1963, B 1121-F, p. F42-F43) from this area contained 7 to 10 percent ilmenite. (The location is somewhat uncertain; sample number 38b is the farthest north sampe locality shown by Rossman (1963) in the intrusion, but it has no analytical data. The location is very close to number 79 of MacKevett and others (1971). These authors cite Rossman, also Kennedy and Walton, 1946, for information on mineral occurrences at or near this site).
  • 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 workings information

  • Workings / Exploration = Surface exposures only. Several investigators, including Kennedy and Walton (1946), Rossman (1963 B 1121-F, MacKevett and others (1971), and Kimball and others (1978) reported occurrences of valuable oxide and sulfide minerals in the northwestern contact zone of the Mt. Crillon-LaPerouse complex in rugged country. There is extensive ice cover.

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS A013126
USGS Alaska Resource Data File ARDF MF050

Bibliographic references

  • Deposit

    Kennedy, G.C. and Walton, M.S., Jr., 1946, Geology and associated mineral deposits of some ultrabasic rocks in southeastern Alaska: U.S. Geological Survey Bulletin 947-D, p. 65-84.

  • 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

    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.

  • 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

    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.

Comments on the references

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

General comments

Subject category Comment text
Deposit Model Name = Similar to Bushveld Fe-Ti-V (Cox and Singer, 1986; model 3). Segregations of ilmenite-magnetite(?) in a in a layered mafic-ultramafic intrusion.
Deposit Other Comments = the site is in Glacier Bay National Park and Preserve.

Reporter information

Type Date Name Affiliation Comment
Reporter 09-APR-99 Hawley, C.C. Hawley Resource Group