Unnamed Occurrence (ARDF - PM093; east of Sapsuk Lake), Alaska Peninsula District, Aleutians East Borough, Alaska, USA
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Location: The map site of this occurrence is at an elevation of about 1,750 feet, approximately 2.3 miles east-southeast of the east end of Sapsuk Lake (Wilson and others, 1988, locality 87). The site is about 0.25 mile south-southeast of the top of hill 2150. The location is accurate to within 1 mile.
Geology: At this site a 0.5-mile-square color anomaly has resulted from the oxidation of disseminated pyrite in Tertiary andesitic to dacitic volcanic rocks (Wilson and others, 1988; 1995). The main areas of interest are three or more tourmaline-cemented breccia pipes occurring near a 40- by 200-foot plug or dike of quartz porphyry (Trujillo and others, 1982). The largest pipe is approximately 40 feet in diameter and contains dacite porphyry fragments and some disseminated chalcopyrite. Soil, rock, and pan samples contained as much as 0.13 ppm gold, 2.8 ppm silver, 255 ppm copper, 410 ppm lead, 232 ppm zinc, and 21 ppm molybdenum.
Workings: In 1982 Resource Associates of Alaska examined the occurrence and collected 30 rock samples, 4 pan samples, and 1 soil sample. These assayed as much as 0.13 ppm gold, 2.8 ppm silver, 255 ppm copper, 410 ppm lead, 232 ppm zinc, and 21 ppm molybdenum (Trujillo and others, 1982).
Age: Tertiary.
Commodities (Major) - Ag, Cu, Pb, Zn; (Minor) - Au, Mo
Development Status: None
Deposit Model: Porphyry Cu, Porphyry Cu-Mo (Cox and Singer; 1986; models 17 and 21a)
Mineral List
3 entries listed. 2 valid minerals.
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References
Trujillo, R.S., Anderson, G., MacLeod, T., Hendrick, K., Farnham, S., Peterson, J., 1981. Exploration and evaluation of the Unga-Popof-Korovan Islands portion of lands leased from Aleut Native Corporation: Resource Associates of Alaska report, 70 p., 38 map sheets, various scales. (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. 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.
