Exray Prospect, Glacier Bay District, Juneau District, Skagway-Hoonah-Angoon Borough, Alaska, USA
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Geology: The general area is underlain by deformed and metamorphosed Silurian or Devonian carbonate, clastic, and volcanic clastic rocks that have been intruded by Upper Jurassic and Lower Cretaceous granitic and dioritic rocks (Brew and others, 1992). The deposit was discovered about 1909 (Brew and others,1978). It is in calcareous argillite and consists of chalcopyrite-bearing calcite veins, breccia zones, and limestone-calcite breccia veins. Samples contain up to 4,300 ppm copper (Brew and others,1978). Early workings included several surface pits and trenches along the veins. Wells and others (1986) show six prospects in this area.
Workings: This deposit was discovered about 1909 and development work consists of several surface pits and trenches.
Commodities (Major) - Cu; (Minor) - Ag
Development Status: No
2 entries listed. 2 valid minerals.
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Brew, D.A., Johnson, B.R., Grybeck, D., Griscom, A., Barnes, D.F., Kimball, A.L., Still, J.C., and Rataj, J.L., 1978, Mineral resources of the Glacier Bay National Monument Wilderness Study Area, Alaska: U.S. Geological Survey Open-File Report 78-494, 670 p., 7 sheets. Brew, D.A., Himmelberg, G.R., Loney, R.A., and Ford, A.B., 1992, Distribution and characteristics of metamorphic belts in the southeastern Alaska part of the North American Cordillera--Metamorphic styles in young and ancient orogenic belts: Journal of Metamorphic Geology, v. 10, no. 3, p. 465-482. Wells, D.E., Pittman, T.L., Brew, D.A. and Douglass, S.L., 1986, Map and description of the mineral deposits in the Juneau, Taku River, Atlin, and part of the Skagway quadrangles, Alaska: U.S. Geological Survey Open-File Report 85-717, 332 p., 1 sheet, scale 1:250,000.