|Quadrangle map, 1:250,000-scale||EA|
|Quadrangle map, 1:63,360-scale||B-1|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||Twin Creek is a small tributary of the lower Fortymile River; its mouth is about 8 miles west of the Canadian border. The location of placer gold mining on Twin Creek is uncertain. The mine coordinates are near the mouth of the creek, in section 31, T. 7 S., R. 33 E., of the Fairbanks Meridian. The location is accurate within 1 mile. Twin Creek is locality 62 of Cobb (1972 [MF-393]) and locality 60 of Eberlein and others (1977).|
The rocks along Twin Creek are Paleozoic amphibolite-facies gneiss and amphibolite (Foster, 1976). Extensive terrace gravel deposits are present on both sides of the lower portion of the Fortymile River, including in the vicinity of the mouth of Twin Creek. The terraces are as much as several hundred feet above the river (Foster and Keith, 1968). Placer gold has been produced on the lower Fortymile River (see EA071) near the mouth of Twin Creek. Mining on Twin Creek itself may be restricted to the area below the benches along the Fortymile River.Prindle (1908) included Twin Creek in gold production totals with Napoleon Creek (EA123), Montana Creek (EA067), Buckskin Creek (EA113), Dome Creek (EA055 or EA079), and Eagle Creek (location unknown), which together produced 121.68 fine ounces of gold from 1904 to 1907. Ellsworth and Davenport (1913) reported that very little progress was made on Twin Creek in 1912. Powers (1935) reported a good showing was made on benches on the Fortymile River near Twin Creek.
|Geologic map unit||(-141.265584325822, 64.2680951569546)|
|Mineral deposit model||Placer Au (Cox and Singer, 1986; model 39a).|
|Mineral deposit model number||39a|
|Age of mineralization||Quaternary.|
|Workings or exploration||Ellsworth and Davenport (1913) reported that very little progress was made on Twin Creek in 1912. Powers (1935) reported a good showing was made on benches on the Fortymile River (see EA071) near Twin Creek.|
|Indication of production||Yes; small|
|Production notes||Prindle (1908) included Twin Creek in gold production totals with Napoleon Creek (EA123), Montana Creek (EA067), Buckskin Creek (EA113), Dome Creek (EA079 or EA055), and Eagle Creek (location unknown), which together produced 121.68 fine ounces of gold from 1904 to 1907.|
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.
Cobb, E.H., 1977, Summary of references to mineral occurrences in the Eagle quadrangle, Alaska: U.S. Geological Survey Open-File Report 77-845, 122 p.
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.
Ellsworth, C.E., and Davenport, R.W., 1913, Placer mining in the Yukon-Tanana region: U.S. Geological Survey Bulletin 542-F, p. 203-222.
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.
Foster, H.L., and Keith, T.C., 1968, Preliminary geologic map of the Eagle B-1 and C-1 quadrangles: U.S. Geological Survey Open-File Report 68-103, 1 sheet, scale 1:63,360.
Powers, J.B., 1935, Synopsis and history of early day mining and prospecting on the Fortymile River and its bars and low benches: Alaska Territorial Department of Mines Miscellaneous Report 60-2, 19 p.
|Reporters||R.L. Flynn; M.B. Werdon|
|Last report date||5/1/2002|