PMRGX-16 Occurrence, Alaska Peninsula District, Aleutians East Borough, Alaska, USA
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Location: This site is located on the Alaska Peninsula on the west side of Clark Bay approximately 2 miles north of Waterfall Point. It is referred to as PMRGX-16 by Wilson and others (1988, locality 65). The locality is accurate to within 1,000 feet.
Geology: Wilson and others (1988) describe this occurrence as a vertical, sericitically altered, zone containing abundant sulfides in volcaniclastic sandstone and siltstone (Wilson and others, 1988). The sedimentary rocks probably are part of the Paleocene to Eocene Tolstoi Formation (Wilson and others, 1995). Amygdaloidal andesite flows are also present in the area. One sample collected by the U.S. Geological Survey in the mid-1980's was reported to be anomalous in antimony, arsenic, barium, and zinc (Wilson and others, 1988).
Workings: Rock sample 83AWs91, collected by the U.S. Geological Survey in the mid-1980s, is reported to be anomalous in antimony, arsenic, barium, and zinc (Wilson and others, 1988).
Age: Tertiary.
Alteration: Sericite alteration is present in an altered zone within sandstone and siltstone.
Commodities (Major) - Sb, Zn; (Minor) - As, Ba
Development Status: None
Mineral List
No entries listed.
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References
Angeloni, L.M., Wilson, F.H., and Sutley, Stephen, 1985, Map and tables showing preliminary rock geochemical data, Port Moller, Stepovak Bay, and Simeonof Island quadrangles, Alaska: U.S. Geological Survey Open-File Report 85-470, 179 p., 1 sheet, scale 1:250,000. 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.