Mayflower

Prospect, Inactive

Commodities and mineralogy

Main commodities Cu
Ore minerals bornite; chalcocite; malachite
Gangue minerals epidote; quartz

Geographic location

Quadrangle map, 1:250,000-scale MC
Quadrangle map, 1:63,360-scale C-7
Latitude 61.6309
Longitude -143.5995
Nearby scientific data Find additional scientific data near this location
Location and accuracy This prospect is on the west wall of a small cirque valley south of Kuskulana Glacier (Winkler and MacKevett, 1981). It is at an elevation of about 4,600 feet, 4,500 feet west of elevation 6310, and 2,500 feet from Kuskulana Glacier. The site is in the northwest corner of section 9, T. 3 S., R. 10 E. of the Copper River Meridian. This is locality 127 of MacKevett (1976), and Cobb and MacKevett (1980) included it under the name 'Mayflower'.

Geologic setting

Geologic description

The deposit at this prospect consists of bornite, chalcocite, and secondary copper minerals (assumed to be mostly malachite) that are associated with quartz and epidote in narrow veins up to 12 inches thick (Moffit and Mertie, 1923; MacKevett, 1976). The veins are localized along faults cutting Triassic Nikolai Greenstone. The deposits 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 (-143.601587740885, 61.6304475217426)
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 deposits were explored by short adits and open cuts.
Indication of production None

Additional comments

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

References