Unnamed (above Northeast Cove)

Prospect, Inactive

Commodities and mineralogy

Main commodities Cu
Other commodities Ag; Zn
Ore minerals chalcopyrite; covellite; pyrrhotite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale SR
Quadrangle map, 1:63,360-scale B-2
Latitude 60.33
Longitude -147.7328
Nearby scientific data Find additional scientific data near this location
Location and accuracy The prospect is located 0.7 mile north of the head of Northeast Cove of Drier Bay and is at an elevation of about 1,000 feet. It is the SW1/4 section 21, T. 3 N., R. 10 E., of the Seward Meridian. This is location S-57 of Jansons and others (1984). This location is accurate to within a quarter of a mile.

Geologic setting

Geologic description

The prospect consists of a 4-foot- by 20-foot open cut exposing interbedded graywacke and slate that contains a silicified, sulfide-bearing zone (Kurtak and Jeske, 1986). The slate and graywacke unit is roughly 300 by 1,000 feet and is enclosed by greenstone; both units are mapped as Orca Group of early Tertiary age (Nelson and others, 1985). The siliceous sulfide-bearing zone varies from 6 inches to 3 feet wide and contains from 5 to 30 percent sulfide minerals. These minerals consist of pyrite, chalcopyrite, and some covellite (Kurtak and Jeske, 1986). Samples from the open cut contained from 25 ppm to 3.8 percent copper and from 0.2 to 28 ppm silver (Kurtak and Jeske, 1986).
Geologic map unit (-147.734837561673, 60.3294264827469)
Mineral deposit model Besshi massive sulfide (Cox and Singer, 1986; model 24b)
Mineral deposit model number 24b
Age of mineralization Tertiary or younger; the mineralization is in rocks of the Orca Group of Tertiary age.
Alteration of deposit The mineralization is in silicified slate, but no details about the alteration are given (Kurtak and Jeske, 1986).

Production and reserves

Workings or exploration Workings on the prospect are a 5- by 35-foot open cut (Kurtak and Jeske, 1986).  Samples from the open cut yielded from 25 ppm to 3.8 percent copper and from 0.2 to 28 ppm silver (Kurtak and Jeske, 1986).
Indication of production None

References