Head-Of-The-Bay (Cordova - Tacoma Copper Co.)

Prospect, Inactive

Commodities and mineralogy

Main commodities Cu
Other commodities Ag; Zn
Ore minerals chalcopyrite; pyrrhotite

Geographic location

Quadrangle map, 1:250,000-scale CV
Quadrangle map, 1:63,360-scale C-5
Latitude 60.663
Longitude -145.551
Nearby scientific data Find additional scientific data near this location
Location and accuracy This prospect is at an elevation of about 1500 feet near the head of Wesley Falls Creek. It is in the SE1/4 sec. 10, T 14 S., R. 2 W., of the Copper River Meridian. Location is accurate to within 1000 ft. Location corresponds to site C-21 of Jansons and others (1984).

Geologic setting

Geologic description

This prospect consists of chalcopyrite and pyrrhotite in fracture zones and as disseminations in the wallrocks in interbedded graywacke, slate, and volcanic rocks of the Tertiary Orca Group (Nelson and others, 1985). Four shear zones 1 to 5 feet wide cut the volcanic rocks.
Geologic map unit (-145.552959708039, 60.662454923842)
Age of mineralization Probably Tertiary based on age of host rock (Nelson and others, 1985).

Production and reserves

Workings or exploration One adit observed in 1980 (Jansons and others, 1984) and reported by Grant and Higgins (1910). Two adits noted during industry exploration activity in 1986. The two adits are approximately 1/4 mile apart (B. Ellis, personal communication, 2000). Sampling and analyses during the 1980s by the U.S. Bureau of Mines (Jansons and others, 1984) resulted in the following values: Six chip samples contained 650 ppm to 4.05% Cu, 3.5 to 310 ppm Zn, and <0.1 to 1.8 ppm Ag. Two grab samples contained 4.6% and 5.2% Cu, 360 ppm and 0.15% Zn, and 8.8 ppm and 11 ppm Ag.
Indication of production None
Reserve estimates Inferred reserves of 800 tons @ 0.6% Cu (Jansons and others, 1984).

Additional comments

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

References