Unnamed (north of Akabluak Pass)

Occurrence, Inactive

Commodities and mineralogy

Main commodities Ag; Cu; Pb; Zn
Other commodities Bi; Sn; W
Ore minerals chalcopyrite; galena; sphalerite
Gangue minerals arsenopyrite; pyrrhotite

Geographic location

Quadrangle map, 1:250,000-scale SP
Quadrangle map, 1:63,360-scale B-4
Latitude 67.476
Longitude -154.678
Nearby scientific data Find additional scientific data near this location
Location and accuracy This site is at an elevation of about 5000 feet about 2 miles north of Akabluak Pass. It is in the SE1/4 of sec. 17, T. 24 N., R. 19 E., of the Kateel River Meridian. The location is accurate to within 1000 ft. This site corresponds to locality 30 of Grybeck and Nelson (1981).

Geologic setting

Geologic description

This site represents several spot checks and short traverses to evaluate about one thousand feet of well-exposed contact of Devonian gneissic granite in contact with Paleozoic strata (Grybeck and Nelson, 1981). The occurrence consists of several small masses of ore minerals, a few feet across. These minerals include various combinations of chalcopyrite, pyrrhotite, sphalerite, arsenopyrite, and galena. The minerals occur erratically in metamorphic rocks along 1000 ft. of the contact zone. This occurrence is one of several associated with the contact zone of the Mt. Igikpak pluton (Newberry and others, 1986).
Geologic map unit (-154.680773536302, 67.4755027220943)
Mineral deposit model Skarn (Cox and Singer, 1986; model 14b)
Mineral deposit model number 14b
Age of mineralization Devonian-related to intrusion of Devonian pluton.

Production and reserves

Workings or exploration Selected hand specimens contain up to 200 ppm Ag, 1000 ppm Bi and W, and more than 1000 ppm Sn (Grybeck and Nelson, 1981). In general, however, the contact is shows little sign of skarn or introduction of metals, and there is no indication of any potential for an ore deposit of significant size.
Indication of production None

References

MRDS Number A011923

References

Newberry, R.J., Dillon, J.T., and Adams, D.D., 1986, Regionally metamorphosed calc-silicate-hosted deposits of the Brooks Range, northern Alaska: Economic Geology, v. 81, p. 1728-1752.
Reporters S.W. Nelson (Anchorage, Alaska)
Last report date 9/20/1999