Unnamed (upper Peacock Creek)

Prospects, Inactive

Commodities and mineralogy

Main commodities Cu

Geographic location

Quadrangle map, 1:250,000-scale MC
Quadrangle map, 1:63,360-scale C-8
Latitude 61.7038
Longitude -143.7621
Nearby scientific data Find additional scientific data near this location
Location and accuracy MacKevett and others (1978) identify 3 prospects on the ridges above Peacock Creek. The location of this record is the central of the 3 prospects on the ridge between the glacier lobes at the head of Peacock Creek. It is at an elevation of about 5,300 feet, 2,500 feet southwest of the center of section 10, T. 2 S. R. 9 E. of the Copper River Meridian. This prospect is included in locality 162 of MacKevett (1976) and locality 12 of MacKevett and others (1978). The location is accurate to within about 100 feet.

Geologic setting

Geologic description

These 3 prospects identified by MacKevett and others (1978) are the sites of old claims and at least some surface exploration of copper-bearing veins. The veins occur in Triassic Nikolai Greenstone which is cut by apophyses of Jurassic granodiorite (Moffit and Mertie, 1923; MacKevett, 1976). 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 (-143.764191452772, 61.7033433849472)
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 Some surface prospecting pits or trenches are probably present at these sites.
Indication of production None

Additional comments

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

References