|Quadrangle map, 1:250,000-scale||BT|
|Quadrangle map, 1:63,360-scale||B-1|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||This occurrence is located on a bluff on the west side of the upper Kanuti River, about 9.5 miles northeast of Olsons Lake. It is at an elevation of about 2,200 feet, near the center of the NW1/4 section 7, T. 19 N., R. 12 W., of the Fairbanks Meridian. The location is accurate within one-half mile.|
Geologic descriptionThis occurrence consists of small grains of galena and sphalerite disseminated in a pyritiferous gossan zone (Patton and Miller, 1970). The gossan zone is about 100 yards long and occurs in silicified and sericitized lower Tertiary(?) rhyolite tuff and tuff breccia. The rhyolite lies on, and possibly intrudes, Cretaceous, biotite quartz monzonite of the Kanuti pluton. Scattered pendants of hornfelsed schist occur in the quartz monzonite. Grab samples from the gossan zone contain as much as 20,000 ppm lead, 3,000 ppm zinc, 30 ppm silver, and 500 ppm copper. Lead values are higher at the north end of the zone; zinc and copper values predominate at the south end.
|Geologic map unit||(-150.203842892997, 66.4918502321666)|
|Alteration of deposit||Pyritiferous zone extensively oxidized to limonite. Rhyolite host is silicified and sericitized.|
|Workings or exploration||Only surface sampling.|
|Indication of production||None|
Additional commentsExamination of deposit was brief and exposures are poor (Patton and Miller, 1970).
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||J.M. Britton (Anchorage)|
|Last report date||8/1/2002|