|Quadrangle map, 1:250,000-scale||EA|
|Quadrangle map, 1:63,360-scale||A-2|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||Uhler Creek drains west into the South Fork of the Fortymile River. Placer tailings are shown on the U.S. Geological Survey 1:63,360-scale topographic map of the Eagle A-2 quadrangle (1956; revised in 1971); the tailings start about 3.7 miles east of the mouth and extend for approximately 1 mile. The coordinates correspond to the midpoint of the tailings, in section 20, T. 8 S., R. 31 E., of the Fairbanks Meridian; the location is accurate. This site is locality 66 of Burleigh and Lear (1994), locality 61 of Eberlein and others (1977), and locality 57 of Cobb (1972 [MF-393]).|
Geologic descriptionThe rocks in Uhler Creek are Paleozoic amphibolite-facies gneiss, amphibolite, amphibolite-feldspar gneiss, and marble (Werdon and others, 2001). The metamorphic rocks have been intruded by several plutonic bodies, including the Uhler pluton, which has a hornblende 40Ar/39Ar plateau age of 188.0 +/- 1.0 Ma, and the Napoleon pluton (see EA115), which has a hornblende 40Ar/39Ar plateau age of 186.5 +/- 1.3 Ma (Layer and others, 2002). These units have been offset by several north-south-trending high-angle faults. Small-scale placer mining occurred on Uhler Creek in the early 1900s and the 1960s, 1970s, and early 1990s (Eberlein and others, 1977; Swainbank and others, 1993).
|Geologic map unit||(-141.633591794121, 64.2007750411486)|
|Mineral deposit model||Placer Au (Cox and Singer, 1986; model 39a).|
|Mineral deposit model number||39a|
|Age of mineralization||Quaternary.|
|Workings or exploration||Small-scale placer mining occurred on Uhler Creek in the early 1900s and in the 1960s, 1970s, and early 1990s (Eberlein and others, 1977; Swainbank and others, 1993).|
|Indication of production||Yes; small|
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.
Cobb, E.H., 1972, Metallic mineral resources map of the Eagle quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-393, 1:250,000 scale, 1 sheet.
Eberlein, G.D., Chapman, R.M., Foster, H.L., and Gassaway, J.S., 1977, Map and table describing known metalliferous and selected nonmetalliferous mineral deposits in central Alaska: U.S. Geological Survey Open-File Report 77-168-D, 132 p., 1 sheet, scale 1:1,000,000.
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.
Layer, P.W., Drake, J., and Szumigala, D.J., 2002, 40Ar/39Ar dates for mineralization and igneous and metamorphic rocks in a portion of the Fortymile mining district, Eagle quadrangle, Alaska: Alaska Division of Geological and Geophysical Surveys Preliminary Interpretive Report. [In preparation in 2002]
Swainbank, R.C., Bundtzen, T.K., Clough, A.H., Hansen, E.W., and Nelson, M.G., 1993, Alaska's Mineral Industry 1992: Alaska Division of Geological and Geophysical Surveys Special Report 47, 80 p.
|Last report date||5/1/2002|