Unnamed Occurrence (ARDF - GO014; west bank of Togiak River), Bristol Bay Region District, Dillingham Borough, Alaska, USA
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Geology: At this occurrence, Jurassic or Cretaceous pillow basalt is cut by a 12- to 15-inch-wide, at least 25-foot-long, quartz vein containing coarsely crystalline sphalerite, minor chalcopyrite, and pyrite (Hoare and Coonrad, 1961). A sample of oxidized sphalerite-rich vein material and its altered volcanic hostrock contained 3 ppm Ag, 110 ppm As, 0.35 ppm Au, 390 ppm Cd, 510 ppm Cu, 10.4 ppm Hg, greater than 5,000 ppm Mn, 6.8 ppm Mo, and greater than 1,400 ppm Zn (Kilburn and others, 1992). The occurrence is in lowlands along the Togiak River. Bedrock exposures are minimal, but parts of a gabbro intrusive are exposed across the river from this locality.
Workings: This occurrence has been reconnaissance mapped and sampled (Kilburn and others, 1992).
Age: Post Early Cretaceous. The host pillow basalt is part of a Jurassic to Lower Cretaceous sedimentary and volcanic assemblage (Hoare and Coonrad, 1978).
Commodities (Major) - Cu, Zn; (Minor) - Ag, Au, Hg, Mo
Development Status: None
Deposit Model: Polymetallic vein (Cox and Singer, 1986; model 22c)
4 entries listed. 4 valid minerals.
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Cobb, E.H., and Condon, W.H., 1972, Metallic mineral resources map of the Goodnews quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-447, scale 1:250,000. Hoare, J.M., and Cobb, E.H., 1977, Mineral occurrences (other than mineral fuels and construction materials) in the Bethel, Goodnews, and Russian Mission quadrangles, Alaska: U.S. Geological Survey Open-File Report 77-156, 98 p. Hoare, J.M., and Coonrad, W.L., 1961, Geologic map of the Goodnews quadrangle, Alaska: U.S. Geological Survey Miscellaneous Geologic Investigations Map I-339, 1 sheet, scale 1:250,000. Hoare, J.M., and Coonrad, W.L., 1978, Geologic map of the Goodnews and Hagemeister Island quadrangles region, southwestern Alaska: U.S. Geological Survey Open-File Report 78-9-B, 2 sheets, scale 1:250,000. Kilburn, J., Box, S.E., Goldfarb, R.J., and Gray, J.E., 1992, Geochemically anomalous areas in the eastern Goodnews Bay 1 degre x 3 degree quadrangle, southwest Alaska, in Bradley, D.C., and Ford, A.B., eds., Geologic studies by the U.S. Geological Survey in 1990: U.S. Geological Survey Bulletin 1999, p. 156-162.