|Quadrangle map, 1:250,000-scale||TL|
|Quadrangle map, 1:63,360-scale||C-2|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||C.C. Hawley and Associates, Inc. (1978, Fig. 4.2-B(3)) locate this prospect on a tributary of Bird Creek in the southwest quarter of Section 22, T. 29 N., R. 9 W., of the Seward Meridian.|
At this locality northeast-striking felsite dikes of Tertiary age cut a sequence of Mesozoic graywacke and argillite (KJs) (C.C. Hawley and Associates, Inc., 1978; Reed and Nelson, 1980). Thin (one-half inch to three inches wide) ladder-type arsenopyrite-scheelite-quartz veins that contain free gold run parallel to the dikes (Reed and others, 1978). Clark and Hawley (1968, p. 41, samples 208 and 210) report 103 ppm gold in a 3-inch-wide arsenopyrite vein; 28.0 ppm gold and 100 ppm tungsten in a 1-inch-wide quartz-arsenopyrite vein.Placer workings downstream in Bird Creek (TL040) are likely derived, at least in part, from this occurrence.
|Geologic map unit||(-150.956289573366, 62.581478697271)|
|Mineral deposit model||Low-sulfide Au-quartz veins (Cox and Singer, 1986; model 36a).|
|Mineral deposit model number||36a|
|Age of mineralization||Tertiary; mineralization is interpreted to be related to the felsite dikes that are described as Tertiary in age by Clark and Hawley (1968).|
|Workings or exploration||Reconnaissance mapping, stream silt and rock sampling by the U.S. Geological Survey (Clark and Hawley, 1968; Reed and Nelson, 1980) and by C.C. Hawley and Associates, Inc. (1978) have been completed in this area. They report that 600 to 800 lb. of scheelite-bearing float was removed from the site by the late Shorty Bradley.|
|Indication of production||None|
|Production notes||600 to 800 pounds of scheelite-bearing float were removed from the site by the late Shorty Bradley (C.C. Hawley and Associates, Inc., 1978).|
Additional commentsPlacer workings downstream in Bird Creek (TL040) are likely derived, at least in part, from this occurrence.
C.C. Hawley and Associates, Inc., 1978, Mineral appraisal of lands adjacent to Mt. McKinley National Park, Alaska: U.S. Bureau of Mines Open-File Report 24-78, 277 p., 12 sheets.
Clark, A.L., and Cobb, E.H., 1972, Metallic mineral resources map of the Talkeetna quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-369, 1 sheet, scale 1:250,000.
Clark, A.L., and Hawley, C.C., 1968, Reconnaissance geology, mineral occurrences, and geochemical anomalies of the Yentna district, Alaska: U.S. Geological Survey Open-File Report 68-35, 64 p.
Cobb, E.H., and Reed, B.L., 1980, Summaries of data on and lists of reference to metallic and selected nonmetallic mineral deposits in the Talkeetna quadrangle, Alaska: U.S. Geological Survey Open-File Report 80-884, 106 p.
MacKevett, E.M., Jr., and Holloway, C.D., 1977, Map showing metalliferous and selected non-metalliferous mineral deposits in the eastern part of southern Alaska: U.S. Geological Survey Open-File Report 77-169-A, 99 p., 1 sheet, scale 1:1,000,000.
Reed, B.L., and Nelson, S.W., 1980, Geologic map of the Talkeetna quadrangle: U.S. Geological Survey Miscellaneous Investigations Map I-1174, 1 sheet, scale 1:250,000.
|Reporters||Madelyn A. Millholland (Millholland & Associates)|
|Last report date||8/10/1998|