Turk Creek Mine, Fortymile District, Southeast Fairbanks Borough, Alaska, USA
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Geology: The rocks in the vicinity of Turk Creek are Paleozoic amphibolite-facies gneiss, schist, and amphibolite, and minor marble (Foster, 1969 [B 1271-G]). Bedrock along the north fork of Turk Creek largely consists of metagabbro; bedrock along the south fork of Turk Creek is serpentinized ultramafic rocks (R.L. Flynn, unpub. data, 2000). Sparse rocks comprised largely of chromite grains as large as 5 millimeters in diameter occur as float in the south fork of Turk Creek (R.L. Flynn, unpub. data, 2000); they may be derived from the large serpentinized ultramafic body in the headwaters of Turk Creek (see EA161). Placer gold in Turk Creek has a fineness of 815 parts of gold per thousand (Metz and Hawkins, 1981). Prospecting for placer gold occurred on Turk Creek in 1954 (Alaska Department of Mines, 1955). Small open-cut mines were active on Turk Creek from 1983 to 1994 and in 1999 and 2000 (Yeend, 1996; Norm LaFramboise, Boundary Explorations, Inc., written commun., 2000).
Workings: Prospecting for placer gold occurred on Turk Creek in 1954 (Alaska Department of Mines, 1955). Small open-cut mines were active on Turk Creek from 1983 to 1994 and in 1999 and 2000 (Yeend, 1996; Norm LaFramboise, Boundary Explorations, Inc., written commun., 2000).
Age: Quaternary.
Production: Placer gold in Turk Creek has a fineness value of 815 parts gold per thousand (Metz and Hawkins, 1981).
Commodities (Major) - Au; (Minor) - Cr
Development Status: Yes; small
Deposit Model: Placer Au (Cox and Singer, 1986; model 39a).
Mineral List
2 entries listed. 2 valid minerals.
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References
Alaska Department of Mines, 1955, Report of the Commissioner of Mines for the biennium ended December 31, 1954: Alaska Department of Mines, 110 p. Asher, R.R., 1970, Geochemistry and geology, Boundary area, Fortymile district, Eagle A-1 quadrangle, Alaska: Alaska Division of Mines and Geology Geochemical Report 23, 32 p., 2 sheets, scale 1:63,360. 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 Metz, P.A., and Hawkins, D.B., 1981, A summary of gold fineness values from Alaska placer deposits: Fairbanks, University of Alaska Mineral Research Laboratory Report No. 45, 63 p. Yeend, W.E., 1996, Gold placers of the historical Fortymile River region, Alaska: U.S. Geological survey Bulletin 2125, 75 p., 1 sheet, 1:250,000 scale.
