Unnamed Occurrence (ARDF - SP021; north of Inyuilak Creek), Shungnak District, Northwest Arctic Borough, Alaska, USA
Located within Gates of the Arctic National Park.
Location: This site is at an elevation of about 4000 feet on a ridge 3 miles north of Inyuilak Creek. It is in the N1/2 of sec. 18, T. 22 N., R. 18 E., of the Kateel River Meridian. The location is accurate to within 1000 ft. The site corresponds to locality 44 of Grybeck and Nelson (1981).
Geology: This occurrence is a contact metamorphic deposit at the contact of Devonian granite and Paleozoic schist (Grybeck and Nelson, 1981). Selected samples contain up 5 ppm Ag, 100 ppm Bi, 1 percent Cu, 30 ppm Sn, and 700 ppm Zn. The deposit is related to intrusion of the granite and is similar to other contact-metamorphic deposits in the Brooks Range (Newberry and others, 1986).
Workings: Site briefly examined during regional geologic mapping by the USGS in the late 1970s.
Age: Devonian; related to the intrusion of Devonian pluton.
Commodities (Major) - Ag, Bi, Cu, Sn, Zn
Development Status: None
Deposit Model: Skarn (Cox and Singer, 1986; model 14b)
ReferencesGrybeck, D.J., and Nelson, S.W., 1981, Mineral deposit map of the Survey Pass quadrangle, Brooks Range, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-1176-F, 1 sheet, scale 1:250,000. Nelson, S.W., and Grybeck, D.J., 1980, Geologic map of the Survey Pass quadrangle, Brooks Range, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-1176-A, 2 sheets, scale 1:250,000. Newberry, R.J., Dillon, J.T., and Adams, D.D., 1986, Regionally metamorphosed calc-silicate-hosted deposits of the Brooks Range, northern Alaska: Economic Geology, v. 81, p. 1728-1752.
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New Locality Added: Magura-Hondol, Hunedoara Co., RomaniaFrom David Von Bargen, 25th May 2013 18:42:02