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Unnamed (North Crillon Glacier)

Prospect in Alaska, United States with commodities Copper, Nickel, Cobalt, Iron, PGE, Titanium
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Sections on this page
  1. Identification information
  2. Geographic coordinates
  3. Site location context
  4. Geographic areas
  5. Commodities
  6. Materials information
  7. Alteration
  8. Mineral occurrence model information
  9. Nearby scientific data
  10. Economic information about the deposit and operations
  11. Mining district
  12. Links to other databases
  13. Bibliographic references
  14. General comments
  15. Reporter information

Geologic information

Identification information

Deposit ID 10308915
MRDS ID A013130
Record type Site
Current site name Unnamed (North Crillon Glacier)
Related records 10002228

Geographic coordinates

Geographic coordinates: -137.31212, 58.65971 (WGS84)
Relative position The occurrence is at an elevation of 3000-3500 feet adjacent to the south wall of North Crillon Glacier. The coordinate location is accurate within about 0.2 mile. It is approximately in the center of the SW 1/4, section 15, T. 37 S., R. 40 E., of the Copper River Meridian The occurrence is approximately that of number 79 of MacKevett and others (1971), number 4 of Cobb (1972), and the location of samples 7S011-015 of Kimball and others (1978).

Site location context

Political divisions (FIPS codes)

Hoonah-Angoon(Census area)

Alaska(state)

United States(country)

North America(continent)

Land(continent)

USGS map quadrangles

Mount Fairweather C-4(quadrangle 1:63,360 scale)

Mount Fairweather NE(quadrangle 1:100,000 scale)

Mount Fairweather(quadrangle 1:250,000 scale)

Hydrologic units (watersheds)

Glacier Bay(hydrologic unit)

Northern Southeast Alaska(hydrologic accounting unit)

Southeast Alaska(hydrologic subregion)

Alaska(hydrologic region)

Federal lands

Glacier Bay National Park(National Park)

National Park NPS(Type of land area)

NPS(Federal land areas administered by NPS)

Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Copper Primary
Nickel Critical Primary
Cobalt Critical Secondary
Iron Secondary
PGE Critical Secondary
Titanium Critical Secondary

Materials information

Materials Type of material
Chalcopyrite Ore
Ilmenite Ore
Magnetite Ore
Pentlandite Ore
Pyrrhotite Ore

Alteration

  • Conspicuous iron-stained zones that resulted from oxidation of iron-rich minerals in the oxide-sulfide segregations.

Mineral occurrence model information

Model code 9
USGS model code 5a
Deposit model name Duluth Cu-Ni-PGE

Nearby scientific data

(1) -137.31212, 58.65971
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = The deposit is in the Crillon-LaPerouse layered mafic-ultramafic pluton near its northwest contact with schistose rocks of probable Mesozoic age. The Crillon-LaPerouse body is the largest of four complexes within Glacier Bay National Park and it hosts the Brady Glacier nickel-copper deposit (MF003--Brew and others, 1978). Disseminated to semi-massive sulfide minerals occur in layered gabbro on the south side of North Crillon Glacier. Conspicuous iron-stained zones estimated to be about 20 feet thick occur in the gabbro body and appear to be continuous for thousands of feet. They are separated by from 30 to 100s of feet of less-stained gabbro. Surface access was gained to one zone that contained a 1-2 foot thick vein of pyrrhotite with some chalcopyrite and ilmenite (Kimball and others, 1978, p. C106-107). The samples contained as much as 3000 ppm nickel, 980 ppm copper, and 0.7 ppm platinum. In the same area, Kennedy and Walton (1946) reported a 5-foot thick zone traceable for thousands of teet that contained as much as 60 percent ilmenite and some sulfides; the same authors (p. 71) report that the weathered metal-rich outcrops are bright red. Kimball and others (1978) note the similarity of mineralization with that reported on the north wall of South Crillon Glacier about one and one-half miles to the south, suggesting similar mineralization in heavily stained but inaccessible zones between the two occurrences.
  • Age = Tertiary.

Economic information about the deposit and operations

Development status Prospect
Commodity type Metallic

Comments on exploration

  • Status = Inactive

Mining district

District name Yakutat

Comments on the workings information

  • Workings / Exploration = The area is extremely steep, and access to the rock exposures from the glaciers is across bergschrunds. A 1 to 2 foot thick zone rich in pyrrhotite was sampled by Kimball and others (1978) at about 30 foot intervals. Nickel content was as much as 3000 ppm, copper was 980 ppm, and cobalt (probably erroneously called chromium in table C-26B) was as much as to 300 ppm. Trace amounts of platinum and palladium were found in one sample. Kennedy and Walton (1946) reported one 5-foot thick layer in the same approximate area that contained 60 percent ilmenite.

Reference information

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

    Cobb, E.H., 1972, Metallic mineral resources of the Mount Fairweather quadrangle, AK: U.S. Geological Survey Miscellaneous Field Study Map MF-436, 1 sheet, scale 1:250,000.

  • 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

    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.

  • Deposit

    Cobb, E.H., 1972, Placer deposits of Alaska: U.S. Geological Survey Open-File Report 508.

Comments on the references

  • Primary Reference = Kimball and others, 1978

General comments

Subject category Comment text
Deposit Model Name = Sulfide/oxide segregations in a layered mafic complex. Occurrences are of the type associated with 'Synorogenic layered mafic complexes of Tertiary age, southeastern Alaska' of Foley and others (1997, p. 441-443).
Deposit Other Comments = Zones possibly project southerly to occurrences on the north side of South Crillon Glacier, and north across North Crillon Glacier to other similar occurrences. The possible continuity of deposits suggests that Brady Glacier-type nickel-copper deposits could exist in the northwest part of the Crillon-La Perouse layered complex. The site is in Glacier Bay National Park and Preserve.

Reporter information

Type Date Name Affiliation Comment
Reporter 15-DEC-98 Hawley, C.C. Hawley Resource Group

Beyond USGS

Supplemental information added by qvyshift.com. Not part of the original USGS MRDS record.

Maps centered on this site

Authoritative Alaska resources

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