Unnamed (south of Twaharpies Glacier)

Occurrence, Inactive

Commodities and mineralogy

Main commodities Cu
Other commodities Ag; As

Geographic location

Quadrangle map, 1:250,000-scale MC
Quadrangle map, 1:63,360-scale B-4
Latitude 61.3621
Longitude -142.2066
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is on a ridge south of Twaharpies Glacier. It is at an elevation of about 6,300 feet, 500 feet north-northwest of elevation 6745 in the SW1/4 of section 9, T. 6 S., R. 18 E. of the Copper River Meridian. This is locality 48 of MacKevett (1976); the location is accurate to within about 100 feet.

Geologic setting

Geologic description

This occurrence consists of Triassic Nikolai Greenstone that is mineralized adjacent to a 15-meter-wide altered fault zone (MacKevett, and Smith, 1968, 1972; MacKevett, 1976). A sample of the mineralized rock contained 2 parts per million (ppm) silver, 7,000 ppm arsenic, and 15,000 ppm copper.
Geologic map unit (-142.208643898392, 61.3616835428477)
Mineral deposit model Vein and coatings

Production and reserves

Workings or exploration Limited surface sampling.
Indication of production None

Additional comments

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