|Quadrangle map, 1:250,000-scale||LC|
|Quadrangle map, 1:63,360-scale||D-1|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||Occurrence is on a peak surrounded by glaciers in the Neacola Mountains, central portion of the Lake Clark D-1 quadrangle. Locality 5 of Nelson and others (1985). SE1/4NE1/4 sec. 20, T. 9 N., R. 22 W., of the Seward Meridian. Accurate within 450 meters.|
Nelson and others (1985) describe a high-grade, iron-poor, garnet-rich skarn deposit that consists of marble interbedded with schist and phyllite and metamorphosed mafic volcanic rocks in a large roof pendant in granitic rocks (Nelson and others, 1983). Mineralization consists of layers and veinlets of massive to disseminated pyrrhotite, chalcopyrite, arsenopyrite, and sphalerite. Nokleberg and others (1987) reported chip samples grading 20 g/t Ag, 0.38 g/t Au, 0.76 percent Cu, 3.4 percent Zn. Similar occurrences include the two unnamed occurrences (ARDF number LC002 and LC010) in the Neacola Mountains.According to Nelson and others (1983, unit MzPzm), some of the metasedimentary rocks may correlate with the Kakhonak Complex of Permian (?), Triassic, and Jurassic age in the Iliamna quadrangle, and some may be graywacke of Jurassic and Cretaceous (?) age that has been metamorphosed by nearby plutonic rocks. Some of the metamorphosed volcanic rocks, especially in roof pendants, are probably part of the volcanic rocks of Tertiary age (Tv).
|Geologic map unit||(-153.208248863942, 60.8563698100072)|
|Mineral deposit model||Cu skarn (Cox and Singer, 1986; model 18b)|
|Mineral deposit model number||18b|
|Age of mineralization||Permian (?) through Tertiary (?).|
|Alteration of deposit||Unknown|
|Workings or exploration||Nokleberg and others (1987; 1997) reported chip samples grading 20 g/t Ag, 0.38 g/t Au, 0.76 percent Cu, 3.4 percent Zn.|
|Indication of production||None|
|Reserve estimates||No reserves|
|Production notes||No production|
Additional commentsDiscovered in 1978 by B.L. Reed. Referenced in Nelson and others, 1985, locality 5 as 'B.L. Reed and D.R. Cox, Oral Communication, 1980.' Site is in Lake Clark National Park and Preserve.
Nelson, W.H., Carlson, C., and Case, J.E., 1983, Geologic map of the Lake Clark quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-1114-A, 1 sheet, scale 1:250,000.
Nelson, W.H., King, H.D., Case, J.E., Tripp, R.B., Crim, W.D., and Cooley, E.F., 1985, Mineral resource map of the Lake Clark quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-1114-B, 1 sheet, scale 1:250,000.
Nokleberg, W.J., Bundtzen, T.K., Berg, H.C., Brew, D.A., Grybeck, D.J., Robinson, M.S., Smith, T.E., and Yeend, W., 1987, Significant metalliferous lode deposits and placer districts of Alaska: U.S. Geological Survey Bulletin 1786, 104 p., 2 plates, scale 1:5,000,000.
Nokleberg, W.J., Bundtzen, T.K., Dawson, K.M., Eremin, R.A., Goryachev, N.A., Koch, R.D., Ratkin, V.V, Rozenblum, I.S., Shpikerman, V.I., Frolov, Y.F., Gorodinsky, M.E., Melnikov, V.D., Diggles, M.F., Ognyanov, N.V., Petrachenko, E.D., Petrochenko, R.I., Pozdeev, A.I., Ross, K.V., Wood, D.H., Grybeck, D., Khanchuck, A.I., Kovbas, L.I., Nekrasov, I.Y., and Sidorov, A.A., 1996, Significant metalliferous and selected non-metalliferous lode mineral deposits and placer districts, and for metallogenesis of the Russian Far East, Alaska, and the Canadian Cordillera: U.S. Geological Survey Open-File Report 96-513-B, 385 p.; U.S. Geological Survey Open-File Report 96-513-B, 385 p. (CD-ROM format).
|Reporters||M.L. Miller (USGS); D.P. Bickerstaff (USGS)|
|Last report date||6/15/1998|