|Quadrangle map, 1:250,000-scale||JU|
|Quadrangle map, 1:63,360-scale||D-5|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||The Endy prospect is at an elevation of about 2,700 feet, approximately 2.5 miles south of Mt. Young and 1 mile north of the Endicott River. It is in the NE1/4 section 21, T. 35 S., R. 59 E. of the Copper River Meridian. The location is accurate within 1/2 mile.|
Geologic descriptionThe 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). Brew and Ford (1985) describe the rocks in the area of this occurrence as predominantly Devonian and Silurian greenstone, greenschist, limestone and graywacke intruded by Cretaceous biotite-hornblende granodiorite. The U.S. Bureau of Mines collected samples of rhyolite, pyritic tuff, and metatuff from the Endy prospect. A rhyolite sample contained 0.21 ppm gold, 270 ppm copper, 930 ppm chromium, and 330 ppm arsenic. A sample of a quartz vein contained 1,400 ppm copper. The deposit was discovered by St. Joseph Mining Co. in 1974, who interpreted it as a stratiform massive sulfide deposit (Clough and Redman, 1989).
|Geologic map unit||(-135.574851511806, 58.8220566067105)|
|Mineral deposit model||Possible metamorphosed Kuroko massive sulfide deposit (Cox and Singer, 1986; model 28a)|
|Mineral deposit model number||28a|
|Workings or exploration||The deposit was discovered by St. Joseph Mining Co. in 1974 (Clough and Redman, 1989).|
|Indication of production||None|
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.
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|