Unnamed (upper Strelna Creek)

Prospect, Inactive

Commodities and mineralogy

Main commodities Cu
Ore minerals malachite; pyrite
Gangue minerals calcite

Geographic location

Quadrangle map, 1:250,000-scale MC
Quadrangle map, 1:63,360-scale C-8
Latitude 61.6193
Longitude -143.9845
Nearby scientific data Find additional scientific data near this location
Location and accuracy This prospect is on the west bank of upper Strelna Creek. It is at an elevation of about 3,700 feet, 3,900 feet west-southwest of elevation 5427, and 2,500 feet west-southwest of the center of section 9, T. 3 S., R. 8 E. of the Copper River Meridian. This is locality 147 of MacKevett (1976) and locality 19 of MacKevett and others (1978). The location is accurate to within about 100 feet. Cobb and MacKevett (1980) included this prospect under the name 'Strelna Cr.'.

Geologic setting

Geologic description

This deposit consists of a 6- to 8-foot-wide altered fault zone that cuts Triassic Nikolai Greenstone (Moffit and Maddren, 1909; MacKevett, 1976). The fault zone contains minor pyrite-calcite veins and malachite staining. An old prospect pit is present at this locality. 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 (-143.98659142257, 61.6188341358299)
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 An old prospect pit is present at this locality.
Indication of production None

Additional comments

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

References