Pierson

Prospect, Inactive

Commodities and mineralogy

Main commodities Ag; Au
Other commodities As; Cu; Zn
Ore minerals chalcopyrite; gold; malachite; pyrite

Geographic location

Quadrangle map, 1:250,000-scale MC
Quadrangle map, 1:63,360-scale C-8
Latitude 61.6057
Longitude -143.6731
Nearby scientific data Find additional scientific data near this location
Location and accuracy This prospect is southeast of the terminus of Kuskulana Glacier. It is at an elevation of about 4,200 feet, 2,800 feet northwest of elevation 5805, and 1,200 feet southwest of the center of section 18, T. 3 S., R. 10 E. of the Copper River Meridian. This is locality 126 of MacKevett (1976) and locality 26 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 a 2- to 3-foot-thick, malachite-stained shear zone that contains pyrite, chalcopyrite, and free gold (Moffit and Mertie, 1923; MacKevett, 1976). The shear zone is between Triassic Nikolai Greenstone and a 30-foot-thick, Tertiary(?), brecciated latite dike that intrudes along the contact of the Nikolai Greenstone and the Triassic Chitistone Limestone. A sample of the sheared rock contained 0.1 part per million (ppm) gold, 1.5 ppm silver, 1,000 ppm arsenic, 200 ppm copper, and 700 ppm zinc. The deposit was explored by a short adit and opencut.
Geologic map unit (-143.675186376013, 61.6052438477318)
Mineral deposit model Polymetallic vein (Cox and Singer, 1986; model 22c)
Mineral deposit model number 22c
Age of mineralization Tertiary(?); the felsic dike associated with the deposit is probably Tertiary.
Alteration of deposit Oxidation.

Production and reserves

Workings or exploration The deposit was explored by a short adit and opencut.
Indication of production None

Additional comments

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

References