Elizabeth

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 61.6476
Longitude -144.0999
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 (Moffit and Mertie, 1923, locality 20, 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 of Cobb and Matson (1972) and locality 55 of Winklerand others (1981 [OFR 80-892-B]). Cobb (1979 [OFR 79-1241]) incuded this prospect under the name 'Elliot Cr.'.

Geologic setting

Geologic description

Small veins, lenses, and impregnations of bornite and chalcocite occur in fractured Triassic Nikolai Greenstone (Moffit and Maddren, 1908, 1909; Moffit and Mertie, 1923) . Locally present gangue minerals are commonly quartz and calcite; secondary copper minerals include malachite and azurite. A grab sample of ore from this prospect contained 21.69 percent copper and 1.87 ounces of silver per ton (Mendenhall and Schrader, 1903, p. 26). Post-mineralization faulting has fractured the deposits. 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 in the McCarthy quadrangle (MacKevett and others, 1997).
Geologic map unit (-144.101994858889, 61.6471328638179)
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 This prospect has been explored by a combination of open cuts, an adit ,and drifts. About 475 feet of underground workings were in place in 1908 (Moffit, 1909).
Indication of production None

Additional comments

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

References