|Quadrangle map, 1:250,000-scale||EA|
|Quadrangle map, 1:63,360-scale||A-1|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||Jefferson Creek is a small north tributary of Jack Wade Creek (EA144). The coordinates correspond to an arbitrarily chosen point on the lower part of Jefferson Creek, in section 4, T. 27 N., R. 20 E., of the Copper River Meridian. This site is locality 100 of Burleigh and Lear (1994).|
Geologic descriptionBedrock in Jefferson Creek consists of Paleozoic amphibolite-facies metamorphic rocks that have been intruded by plutons and dikes of Jurassic age (Foster, 1976; Szumigala and others, 2002). Placer workings are present near the mouth of the creek. Jefferson Creek was mined for placer gold in 1990 (Swainbank and others, 1991).
|Geologic map unit||(-141.488685273786, 64.1468810398481)|
|Mineral deposit model||Placer Au (Cox and Singer, 1986; model 39a).|
|Mineral deposit model number||39a|
|Age of mineralization||Quaternary.|
|Workings or exploration||Jefferson Creek was mined for placer gold in 1990 (Swainbank and others, 1991).|
|Indication of production||Yes|
Burleigh, R.E., and Lear, K.G., 1994, Compilation of data for Phase I of the mineral resource evaluation of the Bureau of Land Management Black River and Fortymile subunits: U.S. Bureau of Mines Open-File Report 48-94, 116 p.
Foster, H.L., 1976, Geologic map of the Eagle quadrangle, Alaska: U.S. Geological Survey Miscellaneous Investigations Series, Map 922, 1 sheet, scale 1:250,000.
Swainbank, R.C., Bundtzen, T.K., and Wood, J.E., 1991, Alaska's mineral industry, 1990: Alaska Division of Geological and Geophysical Surveys Special Report 45, 78 p.
Szumigala, D.J., Newberry, R.J., Werdon, M.B., Athey, J.E., Flynn, R.L., and Clautice, K.C., 2002, Bedrock geologic map of the Eagle A-1 quadrangle, Fortymile mining district, Alaska: Alaska Division of Geological and Geophysical Surveys Preliminary Interpretive Report 2002-1b, 1 sheet, scale 1:63,360.
|Last report date||5/1/2002|