|Quadrangle map, 1:250,000-scale||CR|
|Quadrangle map, 1:63,360-scale||B-1|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||The Big Six prospect is at an elevation of about 1,200 feet, about 1.2 mile north-northwest of triangulation station Ren near the southeast tip of the Kasaan Peninsula. The prospect is about 0.5 mile west of the center of section 10, T. 74 S., R. 87 E.|
Geologic descriptionThe Big Six is an old prospect that was first described by Brooks in 1902 and has only been mentioned in secondary sources since. Chalcopyrite and pyrite occur in an altered zone in limestone near its contact with greenstone. Native copper occurs along joints. Workings consist of a few open cuts. Brooks' location is presumably reliable, but recent mapping in the area by by Eberlein and others (1983) shows only a large Ordovician and Silurian diorite pluton at the south end of the Kasaan Peninsula.
|Geologic map unit||(-132.184890598984, 55.4671200819322)|
|Mineral deposit model||Chalcopyrite in altered zone in limestone.|
|Alteration of deposit||Limestone hostrock is altered.|
|Workings or exploration||Open cuts.|
|Indication of production||None|
Brooks, A.H., 1902, Preliminary report on the Ketchikan mining district, Alaska, with an introductory sketch of the geology of southeastern Alaska: U.S. Geological Survey Professional Paper 1, 120 p.
Cobb, E. H., 1978, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Craig quadrangle, Alaska: U.S. Geological Survey Open-File Report 78-869, 262 p.
Eberlein, G.D., Churkin, Michael, Jr., Carter, Claire, Berg, H.C., and Ovenshine, A. T., 1983, Geology of the Craig quadrangle, Alaska: U.S. Geological Survey Open-File Report 83-91, 52 p.
|Reporters||D.J. Grybeck (Applied Geology)|
|Last report date||5/1/2004|