|Quadrangle map, 1:250,000-scale||SB|
|Quadrangle map, 1:63,360-scale||C-5|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||The map site of this occurrence is at an elevation of about 500 feet on Kupreanof Peninsula, about 0.4 mile north of Hag Peak. It is referred to as SBRGX-41 in Wilson and others (1988, locality 15). The location is accurate to within 1 mile.|
Geologic descriptionThis occurrence is in bedded rocks of the Paleocene to Eocene Stepovak Bay Formation, near a small diorite or quartz diorite intrusion (Wilson and others, 1995). Wilson and others (1988) describe altered volcanic andesitic(?) breccia cut by a series of N 70 E-trending vertical shear zones. Some of the shears contain mineralized quartz veins. Alteration appears along shears and extends for approximately 600 feet along the beach east of the map site (Wilson and others, 1988). Rock samples collected by the U.S. Geological Survey in the mid-1980s were reported to be anomalous in silver, lead, zinc, arsenic, and bismuth (Angeloni and others, 1985; Wilson and others, 1988).
|Geologic map unit||(-159.542117314168, 55.699194936845)|
|Mineral deposit model||Polymetallic veins (Cox and Singer, 1986; model 22c)|
|Mineral deposit model number||22c|
|Age of mineralization||Tertiary.|
|Alteration of deposit||Alteration consists of pink to tan bleaching of originally dark-green andesitic(?) breccia.|
|Workings or exploration||Rock samples 83AWs85 and 83AWs86 collected by the U.S. Geological Survey in the mid-1980s were reported to be anomalous in silver, lead, zinc, arsenic, and bismuth (Angeloni and others, 1985; Wilson and others, 1988).|
|Indication of production||None|
Additional commentsThe site is on the Alaska Peninsula National Wildlife Refuge.
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||11/6/2000|