Specimen Creek Mine, Delta River District, Southeast Fairbanks Borough, Alaska, USA
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Geology: The course of upper Specimen Creek is apparently controlled by a steep fault that strikes north-northeast and that separates mafic-ultramafic rocks of the Upper Triassic Eureka ultramafic complex on the east from Pennsylvanian and Permian strata to the west (Rose, 1965, figure 2; Nokleberg and others, 1991). The placer mine is marked by remnants of sluice boxes; it probably was worked on a small scale. The source of the gold is uncertain; Rose (1965) suggested that it may include pyritic rocks (his group A), ultramafic rocks, and high gravels. Rose (1965, locality 14, figure 2) noted copper-stained areas in metavolcanic rocks on the west bank of Specimen Creek. His stream-sediment samples 220 and 223 were anomalous in copper, zinc, and nickel.
Workings: Several placer claims and remnants of sluices were found on the upper part of Specimen Creek (Rose, 1965). The occurrence is on active Online Exploration claims.
Age: Holocene.
Commodities (Major) - Au; (Minor) - Cu, Ni, Zn
Development Status: Undetermined.
Deposit Model: Placer Au (Cox and Singer, 1986; model 39a).
Mineral List
2 entries listed. 2 valid minerals.
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References
Nokleberg, W.J., Lange, I.M., Roback, R.C., Yeend, Warren, and Silva, S.R., 1991, Map showing locations of metalliferous lode and placer mineral occurrences, mineral deposits, prospects, and mines, Mount Hayes quadrangle, eastern Alaska Range, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-1996-C, 42 p., 1 sheet, scale 1:250,000. Rose, A.W., 1965, Geology and mineral deposits of the Rainy Creek area, Mt. Hayes quadrangle, Alaska: Alaska Division of Mines and Minerals Geologic Report 14, 57 p., 1 sheet, scale 1:36,000.