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Unnamed

Occurrence, Inactive

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Commodities and mineralogy

Main commodities Cu
Other commodities Ag; Au
Ore minerals chalcopyrite; pyrrhotite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale BC
Quadrangle map, 1:63,360-scale A-2
Latitude 56.047
Longitude -130.393
Nearby scientific data Find additional scientific data near this location
Location and accuracy This unnamed occurrence is in Section 22 at an elevation of about 2000 feet on the northwest flank of Banded Mountain (Berg and others, 1977, p. 133 and plate 1; Cobb, 1978, p. 87; Elliott and Koch, 1981, p. 8. loc. 16). The location is probably accurate to within about a quarter of a mile.

Geologic setting

Geologic description

The country rock in the general area of this occurrence is graywacke of the Jurassic or older Mesozoic Hazelton Group (Berg and others, 1977, p. 15 and plate 1). A field investigation in 1973 by the U.S. Bureau of Mines (Berg and others, 1977, p. 133) reported that the deposit consists of a quartz pod that contains pyrrhotite and traces of chalcopyrite, in conspicuously iron-stained graywacke. The pod is about 2 feet thick and probably no more than 20 feet long; it pinches out at either end.
Geologic map unit (-130.394705895259, 56.0466790493966)
Mineral deposit model Polymetallic vein (Cox and Singer, 1986; model 22c).
Mineral deposit model number 22c
Alteration of deposit Graywacke hostrock is conspicuously iron stained.

Production and reserves

Workings or exploration A channel sample taken by the U.S. Bureau of Mines in 1973 across the thickest part of the quartz pod containing the most abundant sulfides assayed 1200 ppm Cu and 1.5 ppm Ag. A grab sample of a smaller pod about 6 inches thick contained a similar amount of Ag, much less Cu, and 0.05 ppm Au.
Indication of production None

Additional comments

Twenty or more claims were staked in 1928 or 1929 on the northwest side of Banded Mountain, but it is not known whether they included this occurrence.
The site is in Misty Fiords National Monument.

References

MRDS Number A010205

References

Berg, H.C., Elliott, R.L., Smith, J.G., Pittman, T.L., and Kimball, A. L., 1977, Mineral resources of the Granite Fiords Wilderness Study Area, Alaska, with a section on aeromagnetic data by Andrew Griscom: U.S. Geological Survey Bulletin 1403, 151 p.
Reporters H. C. Berg (Fullerton, California)
Last report date 5/17/1998