Unnamed (east of lower Nabesna Glacier)

Prospect, Inactive

Commodities and mineralogy

Main commodities Au; Cu
Ore minerals chalcopyrite; gold; pyrite; sphalerite
Gangue minerals quartz; sericite

Geographic location

Quadrangle map, 1:250,000-scale NB
Quadrangle map, 1:63,360-scale A-4
Latitude 62.146
Longitude -142.8238
Nearby scientific data Find additional scientific data near this location
Location and accuracy This prospect is on the lower-west flank of the large ridge east of Nabesna Glacier. It is at an elevation of about 3,500 feet, 1,500 feet east of the glacier and 5,300 feet northwest of peak 6224. The prospect is about 0.2 mile north of the center of section 10, T. 4 N., R. 14 E. of the Copper River Meridian. This is locality 8 of Richter (1973) and locality 25 of Richter and others (1975). Cobb and Richter (1980) include this locality as an 'Unnamed prospect'. It is located to within a few hundred feet.

Geologic setting

Geologic description

Quartz-pyrite veins with minor chalcopyrite and sphalerite cut quartz-eye-bearing volcanic or intrusive rocks (Richter and others, 1975). A grab sample of sericitized quartz diorite from the area assayed 0.02 ounce gold per ton and 3,000 parts per million copper (Richter and Matson, 1970 [OFR 70-276]). Hornblende-plagioclase porphyry and small quartz diorite intrusives of Tertiary in age cut volcanic rocks of the upper Paleozoic Tetelna Volcanics in the area (Richter, 1973; 1976).
Geologic map unit (-142.825925986798, 62.1456063871411)
Mineral deposit model Quartz veins and disseminations with gold and copper
Age of mineralization The altered and mineralized intrusive rocks are considered to be Tertiary (Richter, 1973).
Alteration of deposit Quartz-sericite-pyrite replacement and veining.

Production and reserves

Workings or exploration Some surface prospecting has occurred here.
Indication of production None

Additional comments

The prospect is in the Wrangell-St. Elias National Preserve.

References