Ellis (Boone and Ibeck #1 and #2)

Prospects, Inactive

Commodities and mineralogy

Main commodities Cu
Other commodities Ag
Ore minerals chalcopyrite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale CV
Quadrangle map, 1:63,360-scale C-6
Latitude 60.67
Longitude -146.03
Nearby scientific data Find additional scientific data near this location
Location and accuracy This site represents two prospects in a 2.5-mile-long linear area along the bluff above the northwest shore of Sheep Bay. The map site is at the approximate midpoint between the prospects, in the NW1/4 sec. 11, T. 14 S., R. 5 W., of the Copper River Meridian. This site includes both sites C-52 and C-53 of Jansons and others (1984).

Geologic setting

Geologic description

The prospect consists of chalcopyrite-bearing quartz veins in the Tertiary Orca Group turbidites along the contact of the Sheep Bay pluton (Jansons and others, 1984; Nelson and others, 1985). The Sheep Bay pluton has been radiometrically dated at about 51 Ma (Winkler and Plafker, 1981). Three analyzed samples from Jansons and others' (1984) location C-52 contained 26-115 ppm Cu. Eleven additional samples from the contact area contained 13 ppm to 0.14% Cu and <0.1 ppm to 8.5 ppm silver.
Geologic map unit (-146.031990210604, 60.6694598456944)
Mineral deposit model Copper skarn?
Age of mineralization The age of mineralization is probably 51 Ma based on the age of the Sheep Bay pluton.
Alteration of deposit Contact metamorphism.

Production and reserves

Workings or exploration Area examined by the U.S. Bureau of Mines as part of a mineral evaluation of the Chugach National Forest. Three analyzed samples from location C-52 contained 26-115 ppm Cu. Eleven additional samples from the contact area contained 13 ppm to 0.14% Cu and <0.1 ppm to 8.5 ppm silver (Jansons and others, 1984).
Indication of production None

Additional comments

Chugach Alaska Corporation, Anchorage, Alaska has control of these lands.

References