Occurrence, Inactive

Commodities and mineralogy

Main commodities Ag; Cu; Sb
Ore minerals azurite; chalcopyrite; malachite; tennantite; tetrahedrite

Geographic location

Quadrangle map, 1:250,000-scale AR
Quadrangle map, 1:63,360-scale D-2
Latitude 67.81
Longitude -156.76
Nearby scientific data Find additional scientific data near this location
Location and accuracy Located west of Kavachurak Creek at approximately 2000 ft. (600 m) elevation in T. 28 N., R 9 E., Kateel River Meridian. Shown as locality 71 in Mayfield and Grybeck (1978) and accurate to within 2000 ft. (600 m).

Geologic setting

Geologic description

Four occurrences of Cu-Ag mineralization over 0.15 sq. mi. (200 m sq.) area. Most interesting occurrence is a fan-shaped area of mineralized talus ranging from 5 ft. to 10 ft. (1.3 m to 3 m) wide over a slope distance of 300 ft. (100 m) that consists of dolomite breccia containing masses of tetrahedrite, tennantite, chalcopyrite, malachite and azurite, mixed with fragments of quartz-vein material containing chalcopyrite. Other three occurrences are quartz veins generally 0.5 to 6 in. (1 cm to 12 cm) wide (one vein 1.5 ft. (0.3 m) wide) having strike lengths up to 75 ft. (15 m), and quartz stringer zones 40 ft. to 100 ft. (10.5 m to 30 m) wide, carrying tetrahedrite, chalcopyrite and malachite. Host rock is brecciated dolomite overlain by limestone and underlain by limestone, marble, and a sequence of phyllites; dolomite breccia forms prominent rust-colored hills (Degenhart and others, 1978, p. 351-371).
Geologic map unit (-156.762840035641, 67.8094801199612)
Mineral deposit model Kipushi (Cox and Singer, 1986; model 32c)?
Mineral deposit model number 32c?
Alteration of deposit Fe-staining.

Production and reserves

Workings or exploration Two samples representative of mineralized dolomite breccia contained 18.6 percent Cu over 36 ft. (12 m) length, and 33.8 percent Cu over 50 ft. (17 m) length. One 4 to 6 in. (8 cm to 12 cm) wide quartz vein assayed 6.2 percent Cu, 0.62 percent Zn, 4.9 oz/ton (152g/ton) Ag, and 3.2 percent Sb. Another 40 ft. (13 m) chip sample across a stringer zone assayed 0.8 percent Cu, 0.48 oz/ton (15g/ton) Ag (Degenhart and others, 1978, p. 351-371).
Indication of production None

Additional comments

Three minor occurrences of malachite are present along the north slope of the mountain immediately southwest of Kav occurrence.
All occurrences are located within Noatak National Preserve.


MRDS Number A011906
Reporters K.R. Leonard (USGS), R.L. Elliott (USGS), J.M. Schmidt (USGS)
Last report date 10/26/1992