Egnaty Creek Prospect, Aniak District, Bethel Borough, Alaska, USA
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Geology: The Egnaty Creek prospect consists of fine-grained cinnabar in shear zones and fractures in sandstone and siltstone of the Upper Cretaceous, Kuskokwim Group (Cady and others, 1955; Maloney, 1968). The rocks strike about S35W and dip 45 to 50S. The mercury is mainly disseminated; a few select samples contained about 1.0 percent mercury (Meyers, 1985). No igneous rocks were recognized at the prospect Maloney (1968) described an exploration program at the prospect; cinnabar was found in 100 of 350 auger holes drilled here. No other information is available.
Workings: The Egnaty Creek prospect was staked by John Murphy and George Willis in 1966, after following up the anomalies from a panned-concentrate sample program on Egnaty Creek (Meyer, 1985). The U.S. Bureau of Mines conducted a soil-auger drill program in 1967 and found found cinnabar in 100 of 350 auger holes (Maloney, 1968). Rock samples collected by the U.S. Bureau of Mines contained up to 1.0 percent mercury (Meyers, 1985). Bulk sampling, trenching, limited diamond drilling, and additional soil sampling were also done (Miller and others, 1989).
Commodities (Major) - Hg
Development Status: None
Deposit Model: Silica-carbonate mercury? (Cox and Singer, 1986; model 27c).
2 entries listed. 2 valid minerals.
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Cady, W.M., Wallace, R.E., Hoare, J.M., and Webber, E.J., 1955, The central Kuskokwim region, Alaska: U.S. Geological Survey Professional Paper 268, 132 p. Cobb, E.H., 1972, Metallic mineral resources map of the Sleetmute quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-368, 1 sheet, scale 1:250,000. Cobb, E.H., 1976, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Dillingham, Sleetmute, and Taylor Mountains quadrangles, Alaska: U.S. Geological Survey Open-File Report 76-606, 92 p. Gray, J.E., Gent, C.A., Snee, L.W., and Wilson, F.H., 1997, Epithermal mercury-antimony and gold-bearing vein lodes of southwest Alaska, in Goldfarb, R.J., and Miller, L.D., eds., Mineral Deposits of Alaska: Economic Geology Monograph 9, p. 287-305. Maloney, R.P., 1968, Soil sampling at the Egnaty Creek mercury prospect, Kuskokwim River basin, Alaska: U.S. Bureau of Mines Open-File Report 16-68, 6 p., 2 sheets. Meyer, M.P., 1985, Mineral investigation of the Iditarod-George planning block, central Kuskokwim River area, Alaska: U.S. Bureau of Mines Open-File Report 9-85, 232 p., 4 sheets, scale 1:250,000. Miller, M.L., Belkin, H.E., Blodgett, R.B., Bundtzen, T.K., Cady, J.W., Goldfarb, R.J., Gray, J.E., McGimsey, R.G., and Simpson, S.L., 1989, Pre-field study and mineral resource assessment of the Sleetmute quadrangle, southwestern Alaska: U.S. Geological Survey Open-File Report 89-363, 115 p., 3 plates, scale 1:250,000. Wells, J.T., and Ghiorso, M.S., 1988, Rock alteration, mercury transport, and metal deposition at Sulphur Bank, California: Economic Geology, vol. 83, p. 606-618. White, D. E., and Robinson, C. E., 1962, Sulphur Bank, California, a major hot spring quicksilver deposit, in Engel, A.E.J., James, H.L., and Leonard, B.F., eds., Petrologic studies: A volume in honor of A.F. Buddington: Boulder, Colorado, Geological Society of America p. 397-428.