|Quadrangle map, 1:250,000-scale||SD|
|Quadrangle map, 1:63,360-scale||A-6|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||This occurrence is about 1.0 mile south-southeast of Turn Mountain in a borrow pit along a logging road. It is about 0.5 mile southwest of the center of section 33, T. 55 S., R. 73 E.|
Geologic descriptionThis occurrences was first identified by Still and others (2002). It consists of a shear zone that cuts an intrusive body of Cretaceous black hornblendite that varies to dark gray hornblende gabbro (Karl and others, 1999). The shear zone contains quartz, potassium feldspar, and epidote, with pyrite and chalcopyrite. A layer of weathered pyrite about 1 to 3 inches thick with lenses of chalcopyrite is exposed along the shear zone for about 15 feet in the wall of a borrow pit. A select sample contained 30.6 parts per million (ppm) silver, 11.2 percent copper, and 1,253 ppm molybdenum (Still and others, 2002).
|Geologic map unit||(-133.830560324593, 57.0526227161079)|
|Mineral deposit model||Shear zone with copper and molybdenum values.|
|Age of mineralization||The deposit is along a shear zone in Cretaceous hornblendite to gabbro.|
|Workings or exploration||Only surface sampling by government geologists.|
|Indication of production||None|
Karl, S.W., Haeussler, P.J., and McCafferty, A.E., 1999, Reconnaissance geologic map of the Duncan Canal-Zarembo Island area, southeastern Alaska: U.S. Geological Survey Open-File Report 99-0168, 30 p., 1 sheet, scale 1:150,000.
Still, J.C., Bittenbender, P.E., Bean, K.W., and Gensler, E.G., 2002 Mineral assessment of the Stikine area, central Southeast Alaska: U.S. Bureau of Land Management Technical Report 51, 560 p.
|Reporters||Donald Grybeck (U.S. Geological Survey)|
|Last report date||10/8/2004|