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Unuk River

Occurrence, Inactive

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Commodities and mineralogy

Main commodities Cu
Ore minerals chalcopyrite; pyrite; pyrrhotite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale BC
Quadrangle map, 1:63,360-scale B-3
Latitude 56.33
Longitude -130.77
Nearby scientific data Find additional scientific data near this location
Location and accuracy The approximate location of this occurrence is on the northwest bank of Unuk River about a mile below the Alaska-British Columbia boundary (Elliott and Koch, 1981, p. 8, loc. 13). The location is probably accurate to within about a quarter of a mile.

Geologic setting

Geologic description

The country rocks in the general area of this occurrence are Mesozoic or Paleozoic metasedimentary rocks that locally include marble, and subordinate metavolcanic rocks (Elliott and Koch, 1981; Koch, 1996). The metamorphosed bedded rocks form a mile-wide septum between a stock of Eocene leucocratic quartz monzonite on the north, and a batholith of Tertiary or Cretaceous granodiorite and quartz diorite on the south. The mineral occurrence consists of pyrite, pyrrhotite, and chalcopyrite in a 2-foot thick quartz (?) vein (Wedow and others, 1952, p. 57).
Geologic map unit (-130.771708409286, 56.3296605971794)
Mineral deposit model Polymetallic vein (Cox and Singer, 1986; model 22c)?
Mineral deposit model number 22c?

Production and reserves

Indication of production None

Additional comments

This occurrence is in Misty Fiords National Monument.

References

MRDS Number A010217

References

Wedow, Helmuth, White, M. G., and Moxham, R. M., 1952, Interim report on an appraisal of the uranium possibilities of Alaska: U.S. Geological Survey Open-File Report 52-165, 124 p.
Reporters H. C. Berg (Fullerton, California)
Last report date 5/17/1998