|Quadrangle map, 1:250,000-scale||JU|
|Quadrangle map, 1:63,360-scale||C-4|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||This occurrence is on the west shore of Lynn Canal on the peninsula separating William Henry Bay from Lynn Canal. It is located in the NE1/4 section 34, T. 36 S., R. 61 E. of the Copper River Meridian. The location is accurate.|
Geologic descriptionThis occurrence consists of a pyrite-bearing quartz-calcite vein in greenstone. The vein strikes NW and dips 70 NW, and is conformable to the foliation of the greenstone metavolcanic unit that hosts it. A sample of the quartz-calcite vein contained 2.7 ppm gold, 2,500 ppm copper, and 200 ppm cobalt. A sample of the greenstone contained 0.15 ppm gold, and 550 ppm copper (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).
|Geologic map unit||(-135.221712574368, 58.7093699858926)|
|Workings or exploration||Surface sampling only.|
|Indication of production||None|
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.
Gehrels, G.E., and Berg, H.C., 1994, Geology of southeastern Alaska, in Plafker, George, and Berg, H. C., eds., The geology of Alaska: Geological Society of America, DNAG, The geology of North America, Vol. G-1, p. 451-467.
|Reporters||J.C. Barnett and L.D. Miller (Juneau, Alaska )|
|Last report date||12/15/2001|