Unnamed Occurrence (ARDF - JU002; west of Sullivan Island), Skagway District, Juneau District, Haines Borough, Alaska, USA
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Geology: This occurrence consists of sulfide-bearing quartz-calcite veins in siliceous argillite. The sulfide minerals are arsenopyrite, chalcopyrite, galena, pyrite, and sphalerite. A sample of one vein collected by the U.S. Bureau of Mines contained 0.1 ppm gold, 1,100 ppm copper, 1,800 ppm lead, and 5,000 ppm zinc (Clough and Redman, 1989). The occurrence is in the Dream prospect area (also see JU009), the site of extensive exploration and mapping from 1987 through 1990 by International Curator Resources Ltd. and Placer Dome U.S. (Bull and others, 1989). The area was covered by 600 federal mining claims in 1989, and more than 5000 feet of drilling was completed by the end of 1990 (Swainbank and others, 1991). The area is underlain predominantly 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: The occurrence is in the Dream prospect area (also see JU009), the site of extensive exploration and mapping from 1987 through 1990 by International Curator Resources Ltd. and Placer Dome U.S. (Bull and others, 1989). The area was covered by 600 federal mining claims in 1989 and more than 5000 feet of drilling was completed by the end of 1990 (Swainbank and others, 1991).
Commodities (Major) - Ag, Au, Cu, Pb, Zn
Development Status: None
Mineral List
7 entries listed. 7 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. Bull, K.F., and Radford, G., 1989, Dream project 1989; Final report: Unpublished report for Placer Dome U.S., Inc., 49 p. Clough, A., and Redman, E.C., 1989, Bureau of Mines Mineral Investigations in the Juneau Mining District, Alaska,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: Bureau 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. Swainbank, R.C., Bundtzen, T.K., and Wood, J.E., 1991, Alaska's mineral industry, 1990: Alaska Division of Geological and Geophysical Surveys Special Report 45, 78 p.
