Unnamed (Knight Island, head of Mummy Bay)

Occurrence, Inactive

Commodities and mineralogy

Main commodities Cu
Other commodities Ba; Cr

Geographic location

Quadrangle map, 1:250,000-scale SR
Quadrangle map, 1:63,360-scale A-3
Latitude 60.2333
Longitude -147.7905
Nearby scientific data Find additional scientific data near this location
Location and accuracy The occurrence is located near tidewater on the northeast shore of Mummy Bay northwest of Northeast Arm. It is in the W1/2 section 30, T. 2 N., R. 10 E., of the Seward Meridian. This is location 247 of Tysdal (1978 [MF-880-A]) and location S-34 of Jansons and others (1984). This location is accurate to within half a mile.

Geologic setting

Geologic description

The occurrence is an iron-stained shear zone that contains 5,000 ppm barium, 500 ppm copper, and 300 ppm chrome (Tysdal, 1978 [MF-880-A]). Nelson and others (1985) mapped this area as the southernmost extent of the Port Audry shear zone. The shear zone is as much as 2,000 feet wide, trends generally north, and has a near-vertical dip. The zone is in sedimentary rock and greenstone basalt of the Orca Group of early Tertiary age (Nelson and others, 1985).
Geologic map unit (-147.792560444415, 60.232736260942)
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.

Production and reserves

Workings or exploration A single sample contained 5,000 ppm barium, 500 ppm copper, and 300 ppm chrome (Tysdal, 1978 [MF-880-A]).
Indication of production None