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Eva Creek Mine, Bonnifield District, Denali Borough, Alaska, USA

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Location: The Eva Creek mine is located in sec. 13, T. 10 S., R. 7 W., Fairbanks Meridian. The coordinates given are for a placer-mining operation that was active on Eva Creek in 1916, about one-quarter mile above the mouth of Wilson Creek. This mine is locality 65 of Cobb (1972 [MF 410]). (Note that there is another Eva Creek in the Fairbanks district near Ester (FB050) that also has been placer mined for gold.)
Geology: The first attempt at mining on Eva Creek took place in 1915, when a small quantity of gold was found by two men who opened a small cut in the stream bed of the upper valley (Maddren, 1918, p. 385). Mining also took place in 1916, from 1920 to 1921, from 1933 to 1938, and in 1940 (Cobb, 1976 [OFR 76-662, p. 44]). Ralph Simonson operated a placer mine on the creek in 1989 (Bundtzen and others, 1990, p. 37). The schist in the area is the California Creek Member of the Totalanika Schist; it consists of quart-orthoclase-sericite schist and augen gneiss (Wahrhaftig, 1970 [GQ-810]). A rock unit composed of iron-oxide-cemented gravels that strike northeast and dip 23 SE is above the schist, and under the stream gravels in the upper creek (Maddren, 1918, p. 385-386). Wahrhaftig (1970 [GQ-810]), mapped the middle and lower part of Eva Creek as the Nenana Gravel. Placer gold was mined from Eva Creek in 1916, from 1920 to 1921, from 1933 to 1938, and in 1940 (Cobb, 1976 [OFR 76-662, p. 44]). Scarce wolframite and rare scheelite were also found in placer concentrates (Joesting, 1942 [ATDM Pamph. 1]). The gold varies from 831 to 846 fine (Glover, 1950).
Workings: The first attempt at mining on Eva Creek took place in 1915, when a small quantity of gold was found by two men who opened a small cut in the stream bed in the upper valley (Maddren, 1918, p. 385). In 1916, another placer operation was undertaken, about a quarter mile above the mouth of Wilson Creek (Maddren, 1918, p. 385). Here, three men built an automatic dam and ground sluiced a 3- to 4-foot-thick cut in stream gravels. Mining also took place from 1920 to 1921, from 1933 to 1938, and in 1940 (Cobb, 1976 [OFR 76-662, p. 44]). Ralph Simonson operated a placer mine on the creek in 1989 (Bundtzen and others, 1990, p. 37).
Age: Quaternary placer.
Production: Information on placer production is not available.

Commodities (Major) - Au; (Minor) - W
Development Status: Yes; small
Deposit Model: Placer Au (Cox and Singer, 1986; model 39a)

Mineral List



3 entries listed. 2 valid minerals.

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References

Brooks, A.H., 1922, The Alaska mining industry in 1920: U.S. Geological Survey Bulletin 722-A, p. 1-74. Brooks, A.H., 1923, The Alaska mining industry in 1921: U.S. Geological Survey Bulletin 739-A, p. 1-50. Bundtzen, T.K., Swainbank, R.C., Deagen, J.R., Moore, J.L., 1990, Alaska's Mineral Industry 1989: Alaska Division of Geological & Geophysical Surveys, Special Report 44, 100 p. Cobb, E.H., 1972, Metallic mineral resources map of the Fairbanks quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-410, 1 sheet, scale 1:250,000. Cobb, E.H., 1973, Placer deposits of Alaska: U.S. Geological Survey Bulletin 1374, 213 p. Cobb, E.H., 1975, Mineral resources of Alaska, in Yount, M.E., ed., U.S. Geological Survey Alaska Program, 1975: U.S. Geological Survey Circular 722, p. 37. Cobb, E.H., 1976, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Fairbanks quadrangle, Alaska: U.S. Geological Survey Open-File Report 76-662, 174 p. Glover, A.E., 1950, Placer gold fineness: Alaska Territorial Department of Mines Miscellaneous Report 195-1, 38 p. Joesting, H.R., 1942, Strategic mineral occurences in interior Alaska: Alaska Territorial Department of Mines Pamphlet 1, 46 p. Joesting, H.R., 1943, Strategic mineral occurrences in interior Alaska, supplement to pamphlet no. 1: Alaska Territorial Department of Mines Pamphlet 2, 26 p. Maddren, A.G., 1918, Gold placers near the Nenana coal field: U.S. Geological Survey Bulletin 662-G, p. 363-402. Smith, P.S., 1934, Mineral industry of Alaska in 1933: U.S. Geological Survey Bulletin 864-A, p. 1-94. Smith, P.S., 1936, Mineral industry of Alaska in 1934: U.S. Geological Survey Bulletin 868-A, p. 1-91. Smith, P.S., 1937, Mineral industry of Alaska in 1935: U.S. Geological Survey Bulletin 880-A, p. 1-95. Smith, P.S., 1938, Mineral industry of Alaska in 1936: U.S. Geological Survey Bulletin 897-A, p. 1-107. Smith, P.S., 1939, Mineral industry of Alaska in 1937: U.S. Geological Survey Bulletin 910-A, p. 1-113. Smith, P.S., 1939, Mineral industry of Alaska in 1938: U.S. Geological Survey Bulletin 917-A, p. 1-113. Smith, P.S., 1942, Mineral industry of Alaska in 1940: U.S. Geological Survey Bulletin 933-A, p. 1-102. Thorne, R.L., Muir, N.M., Erickson, A.W., Thomas, B. I., Hedie, H. E., and Wright, W. S., 1948, Tungsten deposits of Alaska: U.S. Bureau of Mines Report of Investigation 4174, 51 p. Wahrhaftig, Clyde, 1970, Geologic map of the Fairbanks A-4 quadrangle, Alaska: U.S. Geological Survey Geologic Quadrangle Map GQ-810, 1 sheet, scale 1:63:360.

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