Unnamed (south end of Herring Bay, Knight Island)

Prospect, Inactive

Commodities and mineralogy

Main commodities Cu
Other commodities Zn
Ore minerals pyrite

Geographic location

Quadrangle map, 1:250,000-scale SR
Quadrangle map, 1:63,360-scale B-2
Latitude 60.4078
Longitude -147.73
Nearby scientific data Find additional scientific data near this location
Location and accuracy The prospect is located a shallow, U-shaped valley in the easternmost arm at the south end of Herring Bay at an elevation of about 500 feet. It is in the W1/2 section 28, T. 4 N., R. 10 E., of the Seward Meridian. This is location S-73 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 heavily iron-stained shear zone cutting greenstone. The zone contains minor pyrite and is exposed for 80 feet in a stream bottom (Kurtak and Jeske, 1986). This shear zone trends N 15 E and dips 70 to 80 E (Kurtak and Jeske, 1986). Nelson and others (1985) mapped the greenstone county rock as Orca Group of early Tertiary age. Two random chip samples from the shear zone contained from 80 to 95 ppm copper and 50 to 150 ppm zinc (Kurtak and Jeske, 1986).
Geologic map unit (-147.732029225077, 60.407221958361)
Mineral deposit model Cyprus massive sulfide (Cox and Singer, 1986; model 24a)
Mineral deposit model number 24a
Age of mineralization Tertiary or younger; the mineralization is in rocks of the Orca Group of Tertiary age.

Production and reserves

Workings or exploration Two adits are reported: one is 5 feet long at an elevation of 450 feet, and the other is 6 feet long at an elevation of 550 feet (Kurtak and Jeske, 1986). Two random chip samples from the shear zone contained from 80 to 95 ppm copper and 50 to 150 ppm zinc (Kurtak and Jeske, 1986).
Indication of production Undetermined

References