Unnamed (near hill 2370 northeast of Aghaluk Mountain)

Occurrence, Inactive

Commodities and mineralogy

Main commodities Ag; Cu
Other commodities Mo; Pb; Sb; Zn
Ore minerals pyrite
Gangue minerals quartz

Geographic location

Quadrangle map, 1:250,000-scale SM
Quadrangle map, 1:63,360-scale C-6
Latitude 61.54779
Longitude -158.17775
Nearby scientific data Find additional scientific data near this location
Location and accuracy This occurrence is in a saddle about 0.3 mile northeast of hill 2370, about 2.9 miles east-northeast of Aghaluk Mountain. It is at an elevation of about 2,000 feet, about 0.3 mile west-southwest of the center of section 21, T. 17 N., R. 50 W., of the Seward Meridian. The location is accurate.

Geologic setting

Geologic description

This occurrence consists of pyrite-bearing hornfels, quartz veins in hornfels, and disseminated pyrite in a felsic intrusion. The felsic dike intrudes sandstone and shale of the Upper Cretaceous, Kuskokwim Group (Cady and others, 1955; M. L. Miller, unpublished field data, 1999). The rocks strikes N44E and dips 50SE. One grab sample of the pyrite-bearing hornfels contained 800 parts per billion (ppb) silver, 4.07 parts per million (ppm) cadmium, 246 ppm copper, 128 ppm lead, 13.1 ppm molybdenum, and 214 ppm zinc (M.L. Miller, unpublished analytical data, 1999).
Geologic map unit (-158.180119987734, 61.5470849367182)
Mineral deposit model Polymetallic vein? (Cox and Singer, 1986; model 22c).
Mineral deposit model number 22c?
Age of mineralization Unknown. The nearby Aghaluk Mountain granite porphyry intrusion and dike swarm has a 40Ar/39Ar age of 71.2 Ma (Bundtzen and others, 1998).
Alteration of deposit Sericitic alteration in felsic dike.

Production and reserves

Workings or exploration The U.S. Geological Survey investigated the site in 1999.
Indication of production None

References