Unnamed Occurrence (ARDF - JU075; near St. James Bay), Skagway District, Juneau District, Haines Borough, Alaska, USA
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Geology: This occurrence is in Silurian graywacke, turbidite, and limestone of the Point Augusta Formation (Brew and Ford, 1985). The deposit consists of pods and stringers of pyrite in siliceous argillite and in quartz veins. A U.S. Bureau of Mines sample of a quartz-calcite vein contained up to 4,000 ppm copper and 1,600 ppm zinc (Clough and Redman, 1989). The general area is underlain by metamorphosed Silurian and Devonian clastic rocks, limestone, and volcanic units; Permian limestone and siltstone; and small plutons of Tertiary and Cretaceous granodiorite (Brew and Ford, 1985).
Workings: Only surface sampling.
Commodities (Major) - Cu, Zn
Development Status: None
Mineral List
3 entries listed. 3 valid minerals.
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References
Brew, D.A., and Ford, A.B., 1985, Preliminary reconnaissance geologic map of the Juneau, Taku River, Atlin, and part of the Skagway 1:250,000 quadrangles, southeastern Alaska: U.S. Geological Survey Open-File Report 85-395, 23 p., 2 sheets, scale 1:250,000. Clough, A.H., and Redman, E.C., 1989, Bureau of Mines mineral investigations in the Juneau mining district, Alaska, 1984-1988, Volume 2, Detailed mine, prospect, and mineral occurrence descriptions, Section C, West Lynn Canal subarea: U.S. Bureau of Mines of Mines Special Publication, 44 p.