Gold-Quartz Prospect, Chistochina District, Valdez-Cordova Borough, Alaska, USA
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Geology: A quartz-carbonate vein occurs in Pennsylvanian volcanic rocks that trends N5-8W and dips 67 West. It occurs between a hanging wall of serpentinized basalt or gabbro with chrysotile-calcite veinlets, and a footwall of tuff(?). Both walls of the vein are brecciated and iron stained. Slickensides and clay gouge with fragments of vein material indicate post-mineralization movement. The vein varies from 3 to 5 feet thick and is composed of locally brecciated, milky quartz with pods of ankerite; sphalerite, and smaller amounts of chalcopyrite, galena, pyrite and precious metals. Samples of vein assayed up to 0.9 ounce of gold per ton and 0.76 ounce of silver per ton, (Richter, 1964, 1966). The volcanic host rocks are part of Pennsylvanian and Permian, Slana Spur Formation. The description is summarized from Richter, 1964, 1966; Cobb, 1979 [OF 79-1247]; and Nokleberg and others, 1994.
Workings: An adit driven on the vein in 1955 and 1956 encountered glacial material 55 feet from the portal.
Age: Emplaced subseqent to or is related to the border phase of the Pennsylvanian to Permian, Ahtell pluton.
Commodities (Major) - Ag, Au, Cu, Pb, Zn; (Minor) - Asbestos
Development Status: None
Deposit Model: Polymetallic vein (Cox and Singer, 1986; model 22c)
6 entries listed. 6 valid minerals.
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Cobb, E.H., 1979, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Gulkana quadrangle, Alaska: U.S. Geological Survey Open-File Report 79-1247, 36 p. MacKevett, E.M., Jr., and Holloway, C.D., 1977, Map showing metalliferous and selected non-metalliferous mineral deposits in the eastern part of southern Alaska: U.S. Geological Survey Open-File Report 77-169-A, 99 p., 1 sheet, scale 1:1,000,000. Nokleberg, W.J., and (seven) others, 1994, Metallogeny and major mineral deposits of Alaska and Metallogenic map of significant metalliferous lode deposits and placer districts of Alaska, in Plafker, G. and Berg, H.C., eds., The Geology of Alaska: Geological Society of America, DNAG, The Geology of North America, Vol.. G1, p. 855-904, Plate 11, scale 1:2,500,000. Richter, D.H., 1964, Geology and mineral deposits of the Ahtell Creek area, Slana district, southcentral Alaska: Alaska Division of Geological and Geophysical Surveys Geologic Report 6, 17 p., 1 sheet, scale 1:31,680. Richter, D.H., 1966, Geology of the Slana district, southcentral Alaska: Alaska Division of Geological and Geophysical Surveys Geological Report 2l, 54 p., 3 sheets, scale 1:63,360. Richter, D.H., and Matson, N.A., Jr., 1972, Metallic mineral resources map of the Gulkana quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-419, 1 sheet, scale 1:250,000.