|Quadrangle map, 1:250,000-scale||SM|
|Quadrangle map, 1:63,360-scale||C-6|
|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 descriptionThis 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felsic dike intrudes sandstone and shale of the Upper Cretaceous, Kuskokwim Group (Cady and others, 1955; M. L. Miller, unpublished field data, 1999).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4.07 parts per million (ppm) cadmium, 246 ppm copper, 128 ppm lead, 13.1 ppm molybdenum, and 214 ppm zinc (M.L. Miller, unpublished analytical data, 1999).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.|
|Workings or exploration||The U.S. Geological Survey investigated the site in 1999.|
|Indication of production||None|
Bundtzen, T.K., Harris, E.E., Miller, M.L., Layer, P.W., and Laird, G.M., 1998, Geology of the Sleetmute C-7, C-8, D-7, and D-8 quadrangles, Horn Mountains, southwestern Alaska: Alaska Division of Geological and Geophysical Surveys Report of Investigations 98-12, 38 p., one sheet, scale 1:63,360.
|Reporters||T.K. Bundtzen (Pacific Rim Geological Consulting, Inc.) and M.L. Miller (U.S. Geological Survey)|
|Last report date||5/10/2003|