Unnamed (near Cheeneetnuk River)

Occurrence, Inactive

Commodities and mineralogy

Main commodities Cu
Other commodities Ag
Ore minerals pyrite

Geographic location

Quadrangle map, 1:250,000-scale MG
Quadrangle map, 1:63,360-scale A-5
Latitude 62.066
Longitude -155.12
Nearby scientific data Find additional scientific data near this location
Location and accuracy The unnamed occurrence is located on a steep east-facing slope overlooking Cheeneetnuk River, at an elevation of 1,400 feet (427 m) in the southern half of sec. 22, T. 23 N., R. 32 W., of the Seward Meridian. The occurrence corresponds to map number 120 of Gilbert (1981); his station no. 77WG5.

Geologic setting

Geologic description

This unnamed occurrence is a mineralized, pyritic argillite near the contact between Middle Devonian limestone and upper Paleozoic argillite, both subdivisions of the Mystic subterrane (Gilbert, 1981; Wilson and others, 1998). The argillite appears to be thermally upgraded to hornfels; a mid-Tertiary granite pluton is exposed about one mile west of the occurrence. One grab sample contained 178 ppm copper and 0.7 grams/tonne silver (Gilbert, 1981).
Geologic map unit (-155.122306324647, 62.0653447044775)
Mineral deposit model Polymetallic replacement? (Cox and Singer, 1986; model 19a?).
Mineral deposit model number 19a?

Production and reserves

Workings or exploration W.G. Gilbert found the mineral zone during a geologic mapping project for the Alaska Division of Geological and Geophysical Surveys in 1977 (Gilbert, 1981). One grab sample contained 178 ppm copper and 0.7 grams/tonne silver.
Indication of production None
Reserve estimates None.

References