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Unnamed (near Scidmore Glacier)

Occurrence in Alaska, United States with commodity Copper
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Geologic information

Identification information

Deposit ID 10002259
MRDS ID A013162
Record type Site
Current site name Unnamed (near Scidmore Glacier)

Geographic coordinates

Geographic coordinates: -136.76211, 58.81278 (WGS84)
Relative position The occurrence is on the east side of Hill 4650 at an elevation of about 4000 feet at the head of Scidmore Glacier. It is about 1 mile east of Reid Glacier, at a point approximately 2.3 miles above the nose of the glacier. The location is probably accurate to within 200 feet vertically and about 0.1 mile horizontally. The location is number 69 of MacKevett and others (1971) and number 48 of Kimball and others (1978).
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Geographic areas

Country State
United States Alaska

Commodities

Commodity Importance
Copper Primary

Materials information

Materials Type of material
Chalcopyrite Ore
Pyrite Ore

Host and associated rocks

  • Host or associated Host
    Rock type Metamorphic Rock > Metasedimentary Rock > Marble

Nearby scientific data

(1) -136.76211, 58.81278
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Comments on the geologic information

  • Geologic Description = The area is underlain by mixed schist, phyllite, and marble of Paleozoic age within a terrane intruded by granitic rocks of Cretaceous age (Brew and others, 1978, pl. 1A). In the area of the mineral occurrence, two conspicuously iron-stained zones as much as 25 feet thick cut tightly folded metasedimentary rocks, mostly marble. Pyrite-bearing quartz veins 1-2 feet in thickness locally cut the iron-stained zones. Chalcopyrite is present locally; a float sample of quartz vein contained 1000 ppm copper, and a 15-foot chip sample of a sulfidized zone contained 300 ppm copper and 7 percent iron; gold and silver were not detected.
  • Age = Probably Cretaceous, related to the intrusion of granitic rocks.

Economic information

Economic information about the deposit and operations

Development status Occurrence
Commodity type Metallic

Comments on exploration

  • Status = Inactive

Mining district

District name Juneau

Comments on the workings information

  • Workings / Exploration = Surface exposures only; an iron stained zone 15 feet thick contained 300 ppm copper; a quartz vein (float) contained 1000 ppm copper (MacKevett and others, 1971, table 9).

Reference information

Links to other databases

Agency Database name Acronym Record ID Notes
USGS Mineral Resources Data System MRDS A013162
USGS Alaska Resource Data File ARDF MF051

Bibliographic references

  • 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.

Comments on the references

  • Primary Reference = MacKevett and others, 1971

General comments

Subject category Comment text
Deposit Model Name = Low-sulfide quartz vein and disseminated sulfides in altered rock.
Deposit Other Comments = Mineralization related to Cretaceous granitic event. The area 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