|Quadrangle map, 1:250,000-scale||TL|
|Quadrangle map, 1:63,360-scale||A-4|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||Clark and Cobb (1972, locality 11) locate this placer prospect at the confluence of the Nakochna River and the Kichatna River in the southeast quarter of Section 24, T. 24 N., R. 14 W., of the Seward Meridian. Reed and others (1978) show this prospect as locality 39.|
Reed and others (1978) describe this site as an old placer prospect on river bars, chiefly for platinum. There is no evidence that the 1917 dredging operation at this site was productive. Cobb and Reed (1980) report some fine gold was recovered from the Nakochna River. No other published data are available.
The sources of platinum may be the ultramafic rocks of the composite plutons (Tcp) described by Reed and Nelson (1980) that extend from Mt. Estelle in the Tyonek quadrangle to the headwaters of Cascade Creek. Anomalous gold, platinum-group elements, copper, chrome, nickel and arsenic are reported from the composite plutons (Reed and others, 1978; Reed and Nelson, 1980; Nelson and others, 1992). Gold and platinum group element placers have been worked at sites downstream from these bodies (Mertie, 1919; Cobb, 1973).Also see TL020, TL023, TL052, and TL05.
|Geologic map unit||(-151.751241778204, 62.1524507367515)|
|Mineral deposit model||Placer Au-PGE (Cox and Singer, 1986; model 39a).|
|Mineral deposit model number||39a|
|Age of mineralization||Pleistocene.|
|Workings or exploration||According to Reed and others (1978) this was a former dredge site.|
|Indication of production||Undetermined|
|MRDS Number||A011550; M045410|
Capps, S.R., 1912, Gold placers of the Yentna district: U.S. Geological Survey Bulletin 520-F, p. 174-200.
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.
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.
Hawley, C.C., and Clark, A.L., 1973, Geology and mineral deposits of the Chulitna -Yentna mineral belt, Alaska: U.S. Geological Survey Professional Paper 758-A, p. A1-A10, 2 plates, scale 1:250,000 and 1:500,000.
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.
Martin, G.C., 1919, Alaska Mining Industry in 1917: U.S. Geological Survey Bulletin 692-A, p. 11-42.
|Reporters||Madelyn A. Millholland (Millholland & Associates)|
|Last report date||8/10/1998|