|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 prospect is at an elevation of about 100 feet, about midway along St. James Bay. It is at the northwest corner of section 8, T. 38 S., R. 62 E. of the Copper River Meridian. The location is accurate within 1/4 mile.|
Geologic descriptionThe St. James Bay prospect consists of three parallel, quartz-calcite veins in black phyllite. The veins strike about west-northwest, dip 76 NE, and can be traced along strike up to 3000 feet. The westernmost vein is up to 15 feet thick and contains galena. The veins were developed in the 1890s by 2 adits driven in 1896. U.S. Bureau of Mines samples contained up to 4.8 ppm silver, 15,100 ppm zinc, and 5,280 ppm lead (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||(-135.224408107889, 58.5951693938624)|
|Workings or exploration||The veins were developed in the 1890s by 2 adits driven in 1896.|
|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|