Unnamed (southeast of Donoho Peak)

Prospect, Inactive

Commodities and mineralogy

Main commodities Cu
Ore minerals bornite; chalcocite

Geographic location

Quadrangle map, 1:250,000-scale MC
Quadrangle map, 1:63,360-scale C-6
Latitude 61.5483
Longitude -142.9585
Nearby scientific data Find additional scientific data near this location
Location and accuracy This prospect is on the south end of the ridge between Root and Kennicott Glaciers. It is at an elevation of about 5,100 feet, 4,600 feet southeast of Donoho Peak (elevation 6696) and 3,300 feet west of Root Glacier. This is locality 96 of MacKevett (1976); the location is accurate to within a few hundred feet.

Geologic setting

Geologic description

The deposit at this prospect consists of chalcocite- and bornite-bearing veins to 6 inches wide that cut Triassic Nikolai Greenstone near the contact with overlying Triassic Chitistone Limestone (MacKevett, 1976). The prospect was explored by shallow surface workings. The widespread deposition of copper in Triassic greenstone and limestone of the area is thought to have accompanied regional deformation and low-grade metamorphism in the Late Jurassic or Early Cretaceous (MacKevett and others, 1997). Copper-bearing minerals were deposited in the underlying Nikolai Greenstone at about 112 Ma (Silberman and others, 1980).
Geologic map unit (-142.960583570799, 61.5478633617462)
Mineral deposit model Basaltic Cu (Cox and Singer, 1986; model 23)
Mineral deposit model number 23
Age of mineralization Cretaceous? The widespread deposition of copper in Triassic greenstone and limestone of the area is thought to have accompanied regional deformation and low-grade metamorphism in the Late Jurassic or Early Cretaceous (MacKevett and others, 1997). Copper-bearing minerals were deposited in the underlying Nikolai Greenstone at about 112 Ma (Silberman and others, 1980).

Production and reserves

Workings or exploration The prospect was explored by shallow surface workings.
Indication of production None

Additional comments

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

References