Miller Peak Occurrence, Glacier Bay District, Juneau District, Skagway-Hoonah-Angoon Borough, Alaska, USA
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Location: This occurrence is at an elevation of approximately 3,000 feet, on the northwest flank of Miller Peak, 2.5 miles east of Sandy Cove in Glacier Bay. It is in the NE1/4 section 28, T. 36 S., R. 57 E. of the Copper River Meridian. The location is accurate.
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). This occurrence was discovered in 1976 by the U.S. Geological Survey (Brew and others, 1978). It consists of widely-spaced quartz veins parallel to the bedding in limestone. A series of sills and ankerite layers up to 10-feet-thick also appear to be parallel to the bedding. One vein is in the footwall of an andesite sill; others are in the limestone. The veins contain ankerite, biotite, chlorite, albite-orthoclase, sericite, calcite, pyrite, chalcopyrite, and malachite. The veins can be traced for hundreds of feet. Channel samples of the veins contained 0.42 to 1.5 percent copper and traces of silver (Brew and others, 1978).
Workings: Surface samples only.
Alteration: Local oxidation of copper minerals.
Commodities (Major) - Ag, Cu
Development Status: No
6 entries listed. 6 valid minerals.
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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. 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.