|Quadrangle map, 1:250,000-scale||JU|
|Quadrangle map, 1:63,360-scale||C-6|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||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.|
Geologic descriptionThe 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).
|Geologic map unit||(-135.905969303143, 58.7232315696067)|
|Alteration of deposit||Local oxidation of copper minerals.|
|Workings or exploration||Surface samples only.|
|Indication of production||None|
Additional commentsThis occurrence is in Glacier Bay National Park and Reserve.
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.
|Reporters||J.C. Barnett and L.D. Miller (Juneau, Alaska )|
|Last report date||12/15/2001|