|Quadrangle map, 1:250,000-scale||SB|
|Quadrangle map, 1:63,360-scale||D-3|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||This site is on the southwest shore of Mitrofania Island about 0.6 mile southwest of the top of hill 1490. It is referred to as SBRX-43 in Wilson and others (1988, locality 17). The location is accurate to within 2,500 feet.|
Geologic descriptionThis occurrence is in an area mapped as undivided Tertiary volcanic rocks (Wilson and others, 1995). Small plutons Miocene or Pliocene granodiorite to quartz diorite crop out a few miles to the north and south of the occurrence (Wilson and others, 1995). At this location altered andesite(?) flows are cut by numerous quartz-calcite veins as much as 6 inches thick (Wilson and others, 1988). Some of the veins are braided and contain pyrite and probably others sulfides. Rock samples collected by the U.S. Geological Survey were reported to be anomalous in silver, gold, lead, zinc, antimony, and arsenic (Angeloni and others, 1985; Wilson and others, 1988).
|Geologic map unit||(-158.901008113003, 55.8232136713513)|
|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 84AGe17-20 and 83AWs 63 collected by the U.S. Geological Survey in the mid-1980s, were reported to be anomalous in silver, gold, lead, zinc, antimony, and arsenic (Angeloni and others, 1985; Wilson and others, 1988).|
|Indication of production||None|
Additional commentsThis site is located on land selected 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.
Arbogast, B.F., Bailey, E.A., and Frisken, J.G., 1987, Analytical results and sample locality maps of stream sediment, heavy-mineral-concentrate, and rock samples from the Port Moller, Stepovak Bay, and Simeonof island quadrangles, Alaska: U.S. Geological Survey Open-File Report 87-502, 122 p., 2 sheets, 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||11/7/2000|