Bailey Prospect, Willow Creek District, Matanuska-Susitna Borough, Alaska, USA
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Geology: Shear zone in tonalite of Late Cretaceous to Tertiary age. Maloney (1966) reported the shear zone to be 200 ft wide and could be traced for 1,500 ft. The shear zone contains bornite, chalcopyrite, covellite, molybdenite, and pyrite; and strikes east, dipping 75 to 80 N. Mineralization is exposed over an area of 50 ft by 500 ft and over a vertical distance of 300 ft. Assays indicated 0.6 oz/ton Au, 1.81 oz/ton Ag, 4.58 percent Cu, and 2.06 percent Mo (Maloney, 1966).
Workings: Old adit, said to have been 40 ft long, was covered by rock slide prior to 1963. Assays indicated 0.6 oz/ton Au, 1.81 oz/ton Ag, 4.58 percent Cu, and 2.06 percent Mo (Maloney, 1966).
Age: Late Cretaceous or younger; shear zone cuts Late Cretaceous to Tertiary tonalite.
Alteration: Sericitization and carbonitization dominate (Ray, 1954).
Commodities (Major) - Ag, Au; (Minor) - Cu, Mo
Development Status: None
Mineral List
5 entries listed. 5 valid minerals.
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References
Cobb, E.H., 1972, Metallic mineral resources map of the Anchorage quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-409, 1 sheet, scale 1:250,000. Cobb, E.H., 1979, Summary of references to mineral occurrences (other than mineral fuels and construction materials in the Anchorage quadrangle, Alaska: U.S. Geological Survey Open-File Report 79-1095, 184 p. Maloney, R.P., 1966, Investigation of the Bailey copper prospect, Willow Creek mining district, southcentral Alaska: U.S. Bureau of Mines Open-File Report 3-66, 7 p.