Unnamed Occurrence (ARDF - PM093; east of Sapsuk Lake), Aleutians East Borough, Alaska, USAi

Regional Level Types
Unnamed Occurrence (ARDF - PM093; east of Sapsuk Lake)	- not defined -
Aleutians East Borough	Borough
Alaska	State
USA	Country

This site is located within the Alaska Peninsula National Wildlife Refuge.
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)

Other Databases

Link to USGS - Alaska:	PM093

Other Regions, Features and Areas containing this locality

References