Unnamed (on Mitrofania Island) (ARDF #SB009) Cu, Pb, Zn

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)

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

MRDS Number	10308214
References Angeloni, L.M., Wilson, F.H., and Sutley, S.J., 1985, Map and tables showing preliminary rock geochemical data, Port Moller, Stepovak Bay, and Simonof Island quadrangles, Alaska: U.S. Geological Survey Open-File Report 85-470, 179 p., 1 sheet, scale 1:250,000. MacKevett, E.M., Jr., and Holloway, C.D., 1977, Map showing metalliferous mineral deposits in the western part of southern Alaska: U.S. Geological Survey Open-File Report 77-169-F, 38 p., 1 sheet, scale 1:1,000,000. Wilson, F.H., Detterman, R.L., Miller, J. W., and Case, J.E., 1995, Geologic map of the Port Moller, Stepovak Bay, and Simeonof Island quadrangles, Alaska: U.S. Geological Survey Miscellaneous Investigation Series Map I-2272, 1 sheet, scale 1:250,000. Wilson, F.H., White, W.H., and DuBois, G.D., 1988, Brief descriptions of mines, prospects, and mineral occurrences in the Port Moller and Stepovak Bay quadrangles, Alaska Peninsula: U.S. Geological Survey Open-File Report 88-666, 128 p., 1 plate, scale 1:250,000.
Reporters	S.H. Pilcher
Last report date	11/4/2000