Independence

Prospect, Inactive

Commodities and mineralogy

Main commodities Cu
Ore minerals bornite; chalcocite
Gangue minerals calcite; epidote; quartz

Geographic location

Quadrangle map, 1:250,000-scale MC
Quadrangle map, 1:63,360-scale C-5
Latitude 61.5152
Longitude -142.8196
Nearby scientific data Find additional scientific data near this location
Location and accuracy This prospect is on the west valley wall of McCarthy Creek. It is at an elevation of about 5,200 feet, 2,700 feet north-northeast of elevation 6184, and about 200 feet north of the south boundary of section 14, T. 4 S., R. 14 E. of the Copper River Meridian. This is locality 90 of MacKevett (1976); the location is accurate to within about 100 feet. Cobb and MacKevett (1980) included this prospect under the name 'Kennecott (Copper Corp.)'.

Geologic setting

Geologic description

This prospect consists of sheeted calcite veins containing chalcocite that are localized in a shear zone cutting Triassic Nikolai Greenstone (Moffit and Capps, 1911, p. 92; MacKevett, 1976). The shear zone with the calcite veins strikes N 38 E and intersects quartz-epidote veins with some bornite that strike N 78 E. The calcite veins continue upward into Triassic Chitistone Limestone but, the chalcocite is restricted to the part of the veins in the Nikolai Greenstone. The deposits were probably explored by at least pits and open cuts. Copper mineralization is common in Nikolai Greenstone and is thought to have accompanied regional deformation and low-grade metamorphism in the Late Jurassic to Early Cretaceous (MacKevett and others, 1997).
Geologic map unit (-142.821680518608, 61.5147645572135)
Mineral deposit model Basaltic Cu (Cox and Singer, 1986; model 23) and/or Kennecott-type copper deposit (after MacKevett and others, 1997)
Mineral deposit model number 23?
Age of mineralization Cretaceous? Copper mineralization is common in Nikolai Greenstone and is thought to have accompanied regional deformation and low-grade metamorphism in the Late Jurassic to Early Cretaceous (MacKevett and others, 1997).

Production and reserves

Workings or exploration The deposits were probably explored by at least pits and open cuts.
Indication of production None

Additional comments

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

References