Unnamed (north of Chitistone River)

Prospect, Inactive

Commodities and mineralogy

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

Geographic location

Quadrangle map, 1:250,000-scale MC
Quadrangle map, 1:63,360-scale B-4
Latitude 61.4734
Longitude -142.4484
Nearby scientific data Find additional scientific data near this location
Location and accuracy This prospect is on the north valley wall of the Chitistone River, one half mile west of Grotto Creek. It is at an elevation of about 4,000 feet, 5,000 feet southeast of elevation 6350 in the SE1/4 of section 35, T. 4 S., R. 16 E of the Copper River Meridian. This is locality 85 of MacKevett (1976); the location is accurate to within a few hundred feet.

Geologic setting

Geologic description

The deposit at this prospect consists of small masses of unspecified copper minerals that are localized near the apex of an overturned fold in the Triassic Nikolai Greenstone (MacKevett, 1976). Some surface exploration took place here as recently as the 1970s (MacKevett, 1976). 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 (-142.450467470736, 61.4729759415986)
Mineral deposit model Basaltic Cu (Cox and Singer, 1986; model 23)
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).
Alteration of deposit Oxidation?

Production and reserves

Workings or exploration Some surface exploration took place here as recently as the 1970s (MacKevett, 1976).
Indication of production None

Additional comments

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

References