|Quadrangle map, 1:250,000-scale||PM|
|Quadrangle map, 1:63,360-scale||A-3|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||The map site of this occurrence is on Unga Island on the east shore of outer Acheredin Bay, about 1.9 miles south of the lagoon at the head of the bay (Christie, 1974, color anomaly 80; Wilson and others, 1988, locality 85). It is referred to as PMRGX-3 (Smoker) in Wilson and others (1988). The location is accurate to within 1,200 feet.|
This occurrence consists of a 1- by 2-mile color anomaly (Christie, 1974, color anomaly 80). At this site, Christie noted 6-inch to 3-foot-thick 'beds' of intensely argillized volcanic rock containing as much as 20 percent pyrite. The average pyrite content is 2 to 5 percent. A fractured diorite dike containing disseminated pyrite also crops out in the area. Two rock samples collected by Christie in 1974 contained as much as 0.01 ppm gold, 2.1 ppm silver, 98 ppm copper, 49 ppm zinc, and 1.6 ppm molybdenum. The country rocks are mapped as Eocene to Oligocene Popof volcanic rocks (Wilson and others, 1995).Six rock samples collected by the U.S. Geological Survey in the mid-1980s were reported to be anomalous in antimony, copper, gold, lead, silver, and tin (Wilson and others, 1988).
|Geologic map unit||(-160.671075049768, 55.1691613976978)|
|Age of mineralization||Eocene or younger.|
|Alteration of deposit||Extensive intense clay-pyrite alteration (acid sulfate?).|
|Workings or exploration||An Aleut-Quintana-Duval joint venture carried out brief reconnaissance mapping and sampling in 1974 (Christie, 1974). Only minor amounts of base and precious metals were found. UNC Teton Exploration Drilling Company geologists examined the site during the period 1979-1981. They called it a 'smoker-type' occurrence, but found little of interest. Samples collected by the U.S. Geological Survey in the mid-1980s were reported to be anomalous in antimony, copper, gold, lead, silver, and tin (Wilson and others, 1988).|
|Indication of production||None|
Additional commentsThe site is located on land patented by, or interim-conveyed to, the Aleut 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.
Christie, J.S., 1974, Aleut-Quintana-Duval 1974 joint venture, final report: Unpublished Quintana Minerals Corporation report, 24 p., 3 appendices, 2 maps. (Report held by the Aleut Corporation, Anchorage, Alaska.)
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||1/27/2001|