Unnamed (south bank of Kotsina River)

Prospect, Inactive

Commodities and mineralogy

Main commodities Ag; Cu
Ore minerals chalcopyrite; pyrite

Geographic location

Quadrangle map, 1:250,000-scale MC
Quadrangle map, 1:63,360-scale C-8
Latitude 61.7165
Longitude -143.8696
Nearby scientific data Find additional scientific data near this location
Location and accuracy This prospect is on the south bank of the Kotsina River, 2,200 feet downstream of the mouth of Amy Creek. It is at an elevation of 2,600 feet, 3,000 feet southeast of the center of section 1, T. 2 S., R. 8 E., of the Copper River Meridian. This is locality 170 of MacKevett (1976) and locality 6 of MacKevett and others (1978). The location is accurate to within about 100 feet.

Geologic setting

Geologic description

The deposit at this prospect consists of pyrite- and chalcopyrite-bearing veins less than 30 centimeters thick that cut Triassic gabbro and Tertiary(?) felsic dikes. Some of the pyrite is localized along iron-stained fault zones (Moffit and Mertie, 1923). Samples of the mineralization contain as much as 3 parts per million (ppm) silver and 1,000 ppm copper. The deposits were explored by several short adits.
Geologic map unit (-143.871692430607, 61.7160392244949)
Mineral deposit model Vein
Age of mineralization Tertiary? The veins cut felsic dikes that may be Tertiary in age.
Alteration of deposit Oxidation.

Production and reserves

Workings or exploration The deposits were explored by several short adits.
Indication of production None

Additional comments

The locality is in the Wrangell-Saint Elias National Park and Preserve.

References