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Unnamed (west of Nahtuk Mountain)

Occurrence, Inactive

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Commodities and mineralogy

Main commodities Cd; Zn
Other commodities Ag
Ore minerals sphalerite

Geographic location

Quadrangle map, 1:250,000-scale SP
Quadrangle map, 1:63,360-scale C-1
Latitude 67.6011
Longitude -153.2719
Nearby scientific data Find additional scientific data near this location
Location and accuracy This site is at an elevation of about 4400 feet, 3.75 miles west of Nahtuk Mountain. It is in the N1/2 of sec. 5, T. 25 N., R. 25 E., of the Kateel River Meridian. Accuracy of location is within 100 ft. The site corresponds to locality 37 of Grybeck and Nelson (1981).

Geologic setting

Geologic description

This occurrence consists of small amounts of sphalerite in quartz veinlets and as disseminated grains in a prominent orange-weathering knob about 30 feet in diameter (Grybeck and Nelson, 1981). The knob consists of dark-gray limestone that is faulted(?) into a sequence of calcareous muscovite phyllite. Selected samples contain more than 1 percent Zn, 500 ppm Cd, and up to 2 ppm Ag. Apparently the mineralized rock is restricted to the knob.
Geologic map unit (-153.274695739531, 67.6006292118632)

Production and reserves

Workings or exploration Site visted during regional geologic mapping by the USGS in the late 1970s.
Indication of production None

Additional comments

Located within Gates of the Arctic National Park.

References

MRDS Number A011921

References

Grybeck, D.J., and Nelson, S.W., 1981, Mineral deposit map of the Survey Pass quadrangle, Brooks Range, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-1176-F, 1 sheet, scale 1:250,000.
Reporters S.W. Nelson (Anchorage, Alaska)
Last report date 9/20/1999