Unnamed (upper Roaring Creek)

Prospects, Inactive

Commodities and mineralogy

Main commodities Cu
Ore minerals bornite; chalcocite; chalcopyrite; malachite

Geographic location

Quadrangle map, 1:250,000-scale MC
Quadrangle map, 1:63,360-scale C-8
Latitude 61.6831
Longitude -143.8307
Nearby scientific data Find additional scientific data near this location
Location and accuracy MacKevett and others (1978) identify several prospects in the upper valley of Roaring Creek. The location of this record is the more central of these prospects. It is at an elevation of about 4,900 feet, 3,700 feet northeast of elevation 7336 (Rock), and 2,400 feet east-northeast of the center of section 19, T. 2 S., R. 9 E. of the Copper River Meridian. This is locality 159 of MacKevett (1976) and locality 15 of MacKevett and others (1978). Cobb and MacKevett (1980) included these prospects under the name 'Roaring Cr.'.

Geologic setting

Geologic description

The deposit at these prospects consist of thin veins that contain small amounts of chalcopyrite, bornite, chalcocite and malachite in Permian sedimentary rocks and Triassic gabbro (Moffit and Mertie, 1923; MacKevett, 1976). They veins were explored by short adits and open cuts. 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 (-143.832790512024, 61.6826396562005)
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).
Alteration of deposit Oxidation.

Production and reserves

Workings or exploration The prospects were explored by short adits and open cuts that are now largely caved.
Indication of production None

Additional comments

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

References