Unnamed (south of Twaharpies Glacier)

Occurrence, Inactive

Commodities and mineralogy

Main commodities Cu
Other commodities Ag
Gangue minerals azurite; malachite

Geographic location

Quadrangle map, 1:250,000-scale MC
Quadrangle map, 1:63,360-scale B-4
Latitude 61.349
Longitude -142.1628
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is on a ridge crest south of Twaharpies Glacier (MacKevett and Smith, 1972). It is at an elevation of about 6,950 feet, 600 feet south of elevation 7080 and 500 feet north of the center of section 15, T. 6 S., R. 18 E. of the Copper River Meridian. This is locality 47 of MacKevett (1976); the location is accurate to within about 100 feet.

Geologic setting

Geologic description

This occurrence consists of azurite and malachite in a narrow shear zone that cuts Permian sedimentary rocks (MacKevett and Smith, 1968, 1972; MacKevett, 1976). A sample of the mineralization contained 2 parts per million (ppm) silver and 20,000 ppm copper.
Geologic map unit (-142.164841726942, 61.3485849936565)
Mineral deposit model Vein
Age of mineralization Permian or younger based on the age of the host rocks.
Alteration of deposit Oxidation.

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.

References