Unnamed (on Mitrofania Island)

Occurrence, Inactive

Commodities and mineralogy

Main commodities Cu; Pb; Zn

Geographic location

Quadrangle map, 1:250,000-scale SB
Quadrangle map, 1:63,360-scale D-3
Latitude 55.87
Longitude -158.82
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is located on Mitrofania Island approximately 1,200 feet north of the north shore of Sosbee Bay (MacKevett and Holloway, 1977, locality 9; Wilson and others, 1988, locality 9). The map site is at an elevation of about 500 feet, 0.4 mile due east of the center of sec. 11, T. 50 S., R. 62 W., of the Seward Meridian. The location is accurate to within 1 mile.

Geologic setting

Geologic description

The country rocks in the area of this occurrence are Tertiary volcanic rocks (Wilson and others, 1995). MacKevett and Holloway (1977) described the occurrence as an altered zone associated with Tertiary granitic rocks, but mapping by the U.S. Geological Survey in the mid-1980s did not indicate any granitic plutons in the general area (Wilson and others, 1995). Samples of volcanic rock collected by the U.S. Geological Survey contained as much as 50 ppm copper, 15 ppm lead, and 55 ppm zinc (Angeloni and others, 1985).
Geologic map unit (-158.822001717505, 55.8692136660329)

Production and reserves

Workings or exploration The U.S. Geological Survey mapped and sampled this area in the mid-1980s (Wilson and others, 1988; 1995). Samples of volcanic rock contained as much as 50 ppm copper, 15 ppm lead, and 55 ppm zinc (Angeloni and others, 1985).
Indication of production None

Additional comments

This occurrence is on lands selected by the Bristol Bay Native Corporation, near the boundary of the Alaska Peninsula National Wildlife Refuge.

References