Chance

Prospect, Inactive

Commodities and mineralogy

Main commodities Cu
Other commodities Ag
Ore minerals azurite; bornite; chalcopyrite; malachite
Gangue minerals calcite; quartz

Geographic location

Quadrangle map, 1:250,000-scale VA
Quadrangle map, 1:63,360-scale C-1
Latitude 61.6712
Longitude -144.1628
Nearby scientific data Find additional scientific data near this location
Location and accuracy This prospect is on the divide between Five Sheep and Magpie Creeks on the north side of the valley of Elliott Creek; it is at an elevation of 4,500 feet near the northwest corner of section 28, T. 2 S., R. 7 E., of the Copper River Meridian. This prospect is approximately located, perhaps to within one-half mile. It is locality 62 of Cobb and Matson (1972) and locality 53 of Winkler and others (1981 [OFR 80-892-B]). Cobb (1979 [OFR 79-1241]) incuded this prospect under the name 'Elliot Cr.'.

Geologic setting

Geologic description

Thin veins, films, and disseminations of bornite, chalcocite, and pyrite cut Triassic Nikolai Greenstone in this area (Moffit and Maddren, 1908 and 1909; Moffit and Mertie, 1923). The gangue minerals are commonly quartz, calcite, and epidote; secondary copper minerals include malachite, azurite, and some chalcanthite. Some mineralization occurs as irregular pods in greenstone. The Nikolai Greenstone and overlying Chitistone Limestone are deformed into a large, asymmetric anticline with its axis approximately parallel to Elliot Creek. The copper mineralization is believed to be related to the regional mineralizing event that produced the rich Kennecott copper deposits to the east in the McCarthy quadrangle (MacKevett and others, 1997).
Geologic map unit (-144.164897538301, 61.6707324325808)
Mineral deposit model Thin veins, impregnations, 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 Some small open cuts are probably present.
Indication of production None

Additional comments

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

References