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Unnamed (near Scidmore Glacier)

Occurrence, Inactive

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Commodities and mineralogy

Main commodities Cu
Ore minerals chalcopyrite; pyrite

Geographic location

Quadrangle map, 1:250,000-scale MF
Quadrangle map, 1:63,360-scale D-3
Latitude 58.813
Longitude -136.76
Nearby scientific data Find additional scientific data near this location
Location and accuracy 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).

Geologic setting

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.
Geologic map unit (-136.761861419369, 58.8126047968394)
Mineral deposit model Low-sulfide quartz vein and disseminated sulfides in altered rock.
Age of mineralization Probably Cretaceous, related to the intrusion of granitic rocks.

Production and reserves

Workings or 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).
Indication of production None

Additional comments

Mineralization related to Cretaceous granitic event. The area is in Glacier Bay National Park and Preserve.

References

MRDS Number A013162

References

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., 7 sheets.
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.
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.
Reporters C.C. Hawley (Hawley Resource Group)
Last report date 4/9/1999