|Quadrangle map, 1:250,000-scale||SB|
|Quadrangle map, 1:63,360-scale||D-5|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||This site is located on the south shore of Egg Island in Humpback Bay on the Alaska Peninsula. It is referred to as SBRGX-50 in Wilson and others (1988, locality 24). The location is accurate to within 1,200 feet.|
Geologic descriptionThis occurrence is in an area mapped as Paleocene to Eocene Tolstoy Formation (Wilson and others, 1995). The occurrence consists of sandstone, shale, and coal beds that are cut by andesite sills and a hypabyssal andesite plug (Wilson and others 1988). Calcite veins occur in an intensely fractured zone in andesite. The veins are as much as 4 inches thick and contain galena, pyrite, and sphalerite, along with inclusions of brecciated andesite. The controlling fractures are probably localized along a thrust fault mapped through this area (Wilson and others, 1988). Samples collected by the U.S. Geological Survey were reported to be anomalous in arsenic, copper, and zinc (Wilson and others, 1988).
|Geologic map unit||(-159.354052377721, 55.8212022622214)|
|Mineral deposit model||Polymetallic veins (Cox and Singer, 1986; model 22c)|
|Mineral deposit model number||22c|
|Age of mineralization||Tertiary.|
|Workings or exploration||Rock samples 84AWs170, 172-173, collected by the U.S. Geological Survey in the mid-1980s, were reported to be anomalous in arsenic, copper, and zinc (Wilson and others, 1988).|
|Indication of production||None|
Additional commentsThis site is located on land interim-conveyed to, or patented by, the Bristol Bay Native Corporation.
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.
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.
|Last report date||11/9/2000|