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Unnamed (west of Rendu Inlet)

Occurrence, Inactive

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Commodities and mineralogy

Main commodities Mo
Other commodities Cu
Ore minerals chalcopyrite; molybdenite; pyrite; pyrrhotite
Gangue minerals quartz; feldspar

Geographic location

Quadrangle map, 1:250,000-scale MF
Quadrangle map, 1:63,360-scale D-3
Latitude 58.94
Longitude -136.69
Nearby scientific data Find additional scientific data near this location
Location and accuracy The occurrence is at about 2500 feet elevation near or on the ridge between Rendu Inlet and Tarr Inlet about 4.2 miles southeast of Mt. Abdallah. Precision of location is poor; it is probably accurate within 0.5 mile. The occurrence is number 60 of MacKevett and others (1971) and number 42 of Kimball and others (1978).

Geologic setting

Geologic description

The area is mainly underlain by foliated granitic rock of Cretaceous age, subordinate marble of Paleozoic age and possibly argillic metasedimentary rocks of Devonian and Silurian age (Brew and others, 1978, pl. IA). Molybdenite, chalcopyrite, pyrite and pyrrhotite occur in quartz veins, less than 3 inches thick, at a spacing of several feet. Veins also occur in quartz-rich pegmatitic dikes in a 25-foot thick zone in granitic rocks. The veins and dikes have variable strikes, but most strike northward and dip to the east (MacKevett and others, 1971, p. 79; also table 9). No analyses were reported by either MacKevett and others or by Kimball and others, 1978).
Geologic map unit (-136.691870537155, 58.939605549968)
Mineral deposit model Copper-molybdenum stockwork mineralization. Porphyry Cu and porphyry Mo (Cox and Singer, 1986; model 17 and 21b).
Mineral deposit model number 17 and 21b
Age of mineralization Probably Cretaceous.

Production and reserves

Workings or exploration Surface exposure, no workings. No analyses reported.
Indication of production None

Additional comments

Isolated occurrence of molybdenum and copper minerals in Glacier Bay National Park and Preserve.

References

MRDS Number A013164

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