Mary Ellen

Prospect, Inactive

Commodities and mineralogy

Main commodities Au; Cu
Ore minerals chalcopyrite; gold; pyrite

Geographic location

Quadrangle map, 1:250,000-scale VA
Quadrangle map, 1:63,360-scale C-1
Latitude 61.6467
Longitude -144.1001
Nearby scientific data Find additional scientific data near this location
Location and accuracy This prospect is near Rainbow Creek on the north side of Elliott Creek valley (Moffit and Mertie, 1923, locality 22, plate 3); it is at an elevation of about 4,100 feet in the SW1/4 section 35, T. 2 S., R. 7 E., of the Copper River Meridian. This prospect is approximately located, perhaps to within one-half mile. It is included in locality 65 Cobb and Matson (1972) and locality 55 of Winkler and others (1981[OFR 80-892-B]).

Geologic setting

Geologic description

Triassic Nikolai Greenstone is shattered and mineralized with pyrite and chalcopyrite at this prospect; gold was reported to be present in weathered surface material (Moffit, 1915). The Nikolai Greenstone and overlying Chitistone Limestone are deformed into a large, asymmetric anticline with its axis approximately parallel to Elliott Creek. The copper mineralization is believed to be related to the regional mineralizing event that produced the rich Kennecott copper deposits in the McCarthy quadrangle (MacKevett and others, 1997).
Geologic map unit (-144.102194821453, 61.6462328357616)
Mineral deposit model Veins, disseminations, and fracture fillings in greenstone; probably related to Kennecott-type copper deposits (MacKevett and others, 1997)
Age of mineralization The copper mineralization is believed to be related to the mineralizing event that produced the rich Kennecott copper deposits in the McCarthy quadrangle to the east (MacKevett and others, 1997). This event is interpreted to have accompanied Late Jurassic or Early Cretaceous deformation and metamorphism (MacKevett and others, 1997, p. 88).

Production and reserves

Workings or exploration This prospect was explored with an adit and open cuts.
Indication of production None

Additional comments

This prospect is within the Wrangell-St. Elias National Park.

References