|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 prospect is at an elevation of approximately 100 feet, 0.5 mile north-northwest of the mouth of York Creek It is just east of the center of section 24, T. 37 S., R. 57 E. of the Copper River Meridian. The location is accurate.|
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 deposit was discovered in 1899. It is in hornfels, and consists of 5 widely-spaced, pyrite-rich quartz veins and of altered zones that contain pods of pyrite. The veins are up to 0.5 foot thick, and the altered zones are up to 50 feet thick. A nearby, half-mile-long, iron-stained zone in siliceous limestone contains 5-10% pyrrhotite (Brew and others, 1978). A select grab sample of one of the quartz veins contained 1,500 ppm copper, 150 ppm cobalt, 150 ppm nickel, and a trace of gold (MacKevett and others, 1971).
|Geologic map unit||(-135.920663458883, 58.6473374760434)|
|Alteration of deposit||Conspicuous iron-stained zone.|
|Workings or exploration||Surface sampling only.|
|Indication of production||None|
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.
|Reporters||J.C. Barnett and L.D. Miller (Juneau, Alaska )|
|Last report date||12/15/2001|