Smith Creek Mine, Fortymile District, Southeast Fairbanks Borough, Alaska, USA
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Geology: The rocks along most of Smith Creek are Paleozoic gneiss, schist, amphibolite, quartzite, and marble (Foster, 1969 [B 1271-G]). Dioritic to granodioritic gneiss and graphitic quartzite and quartz-muscovite schist of the Nasina Series of Devonian to Mississippian age crop out at the head of Smith Creek (Mortensen, 1988; Mortensen, 1999). Extensive terrace gravel deposits occur on both sides of the lower portion of the Fortymile River (see EA071), including in the Smith Creek valley. Gold-bearing gravels were found for at least 2 miles along Smith Creek and its benches, but the creek was not regarded as rich (Powers, 1935). Mining occurred on Smith Creek in 1932 (Smith, 1934 [B 857-A]), and two men were working on Smith Creek in the mid-1930's (Powers, 1935). There was prospecting on Smith Creek in 2000 (R.L. Flynn, unpub. data, 2000). Placer gold has also been produced on the lower Fortymile River near the mouth of Smith Creek.
Workings: Gold-bearing gravels were found for at least 2 miles along Smith Creek and its benches, but the creek was not regarded as rich (Powers, 1935). Mining occurred on Smith Creek in 1932 (Smith, 1934 [B 857-A]), and two men were working on Smith Creek in the mid-1930's (Powers, 1935). There was prospecting on Smith Creek in 2000 (R.L. Flynn, unpub. data, 2000). Placer gold has also been produced on the lower Fortymile River (see EA071) near the mouth of Smith Creek.
Commodities (Major) - Au
Development Status: Yes; small
Deposit Model: Placer Au (Cox and Singer, 1986; model 39a).
1 entry listed. 1 valid mineral.
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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. Foster, H.L., 1969, Reconnaissance geology of the Eagle A-1 and A-2 quadrangles, Alaska: U.S. Geological Survey Bulletin 1271-G, p. G1-G30. 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. Mortensen, J. K., compiler, 1988, Geology, southwestern Dawson map area, Yukon Territory (NTS 116B, C): Geological Survey of Canada Open File 1927, 1 sheet, scale 1:250 000. Mortensen, J.K. (compiler), 1999, Yukonage--An isotopic age database for the Yukon Territory, in Gordey, S.P., and Makepeace, A.J., compilers, Yukon Digital Geology: Indian and Northern Affairs Canada, Exploration and Geological Services Division, Yukon Region. Powers, J.B., 1935, Brief history of the Fortymile and Eagle Mining Districts to 1935: Alaska Territorial Department of Mines Mineral Report MR 60-2, 19 p. Smith, P.S., 1934, Mineral industry of Alaska in 1932: U.S. Geological Survey Bulletin 857-A, p. 1-91.