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Unnamed (north wall of South Crillon Glacier)

Occurrence in Alaska, United States with commodities Copper, Nickel, Gold, Cobalt, Iron
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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. Host and associated rocks
  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 10002227
MRDS ID A013129
Record type Site
Current site name Unnamed (north wall of South Crillon Glacier)
Related records 10185739

Geographic coordinates

Geographic coordinates: -137.30601, 58.63971 (WGS84)
Relative position The occurrence is on the north wall of South Crillon Glacier at about 3600 feet elevation and about 1.4 miles north-northwest of hill 6902, which was called Mt. Lookout by Rossman (1963, B 1121-F). The location given is that of Kimball and others (1978, fig. C32, occurrence in fig. C33). It is probably 0.2-0.3 mile northeast of location 80 in MacKevett and others (1971) and location 3 of Cobb (1972, MF-436). (Also see MF020).? The occurrence is probably accurate to 0.1 mile.

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
Gold Secondary
Cobalt Critical Secondary
Iron Secondary

Materials information

Materials Type of material
Chalcopyrite Ore
Magnetite Ore
Pentlandite Ore

Alteration

  • (Local) Conspicuous iron-stained zones.

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) -137.30601, 58.63971
ListMap

Economic information

Comments on the geologic information

  • Geologic Description = The copper-nickel occurrence is in the Crillon-LaPerouse layered mafic-ultramafic pluton, near its western contact. The pluton is of Tertiary age; it was intruded into biotite and hornblende schist (Brew and others, 1978). The schist units are in the upper Chugach terrane of Berg and others (1972). ? At the occurrence, iron-stained zones as much as 20 feet thick and traceable visually for thousands of feet occur in layered gabbro. The zones appear to cut the layering of the gabbro at a small angle and are proposed to be shear zones (Kimball and others, 1978, p. C101-102). At one accessible location a 6-8 foot thick heavily iron stained layer was mapped and sampled over a strike length of 120 feet. The zone contains disseminated chalcopyrite and pyrrhotite. Within this zone, a thin (0.6) foot lens about 12 feet long contains semimassive sulfide concentrations of chalcopyrite, pyrrhotite and pentlandite. A sample from the zone contained 3000 ppm copper, 2500 ppm nickel, and 700 ppm cobalt. Gold was detected in two samples; the select sample contains greater than 20 percent iron (Kimball and others, 1978, p. C102 and figures C32 and C33).
  • Age = Tertiary.

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 = The occurrences are surface exposures with no workings. The U.S. Bureau of Mines (Kimball and others, 1978, p. C101-102, figs. C32 and 33) found as much as 0.24 percent copper, 700 ppm nickel, 150 ppm cobalt, and 0.10 ppm gold in the mineralized zone which is as much as 8 feet thick. Mineralized sheared gabbro contains as much as 0.3 percent copper, 2500 ppm nickel and 700 ppm cobalt in a narrow (0.6 foot) high grade lens within the mineralized zone.

Reference information

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

    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

    Berg, H.C., Jones, D. L., and Richter, D. H., 1972, Gravina-Nutzotin Belt-tectonic significance of an Upper Mesozoic sedimentary and volcanic sequence in southern and southeastern Alaska: U.S. Geological Survey Professional Paper 800-D, p. D1-D24.

  • 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

    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, 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 segregations in shear zones that cut layered gabbro.
Deposit Other Comments = the area is near the contact of the Crillon-La Perouse stock of layered gabbro in Glacier Bay National Park and Monument. The area is extremely rugged. Other deposits could exist nearby.? 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

Beyond USGS

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

Maps centered on this site

Authoritative Alaska resources

These are landing pages for further research — the state agencies don't currently expose per-mine deep links.