|Quadrangle map, 1:250,000-scale||SI|
|Quadrangle map, 1:63,360-scale||A-4|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||The Cascade prospect is at an elevation of about 1,000 feet on the ridge just southwest of Billy Basin. The prospect is 0.2 mile northeast of the center of sec. 29, T. 55 S., R. 64 E. It is location P-114 of Bittenbender and others (1999); location 54 of Cobb (1972, 1978); and MAS no. 0021140021 (U.S. Bureau of Land Management, 2002). The location is accurate within 0.5 mile.|
The rocks in the vicinity of the Cascade prospect consist of Jurassic and Triassic, amphibolite and greenschist surrounded by rocks of the Jurassic and Triassic, Khaz Formation which consists of graywacke, greenschist, metachert, phyllite, and minor limestone (Loney and others, 1975).As originally described by Knopf (1912), the Cascade prospect consists of shattered quartzite cemented by quartz veinlets with pyrrhotite, arsenopyrite, and rare chalcopyrite. Cobb (1978) infers gold in the deposit. There has apparently been little work on the deposit since before 1912 and while Bittenbender and other (1999) show the prospect on a location map, they do not mention it otherwise.
|Geologic map unit||(-135.269661750396, 57.0728380974241)|
|Mineral deposit model||Shattered quartzite with pyrrhotite, arsenopyrite, and chalcopyrite.|
|Age of mineralization||Triassic or younger based on the age of the host rocks.|
|Workings or exploration||Apparently only surface sampling.|
|Indication of production||None|
Bittenbender, P., Still, J.C., Maas, K., and McDonald, M., Jr., 1999, Mineral resources of the Chichagof and Baranof Islands area, southeast Alaska: Bureau of Land Management, BLM-Alaska Technical Report 19, 222 p.
Cobb, E.H., 1972, Metallic mineral resources map of the Sitka quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-467, scale 1:250,000.
Cobb, E.H., 1978, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Sitka quadrangle: U.S. Geological Survey Open-File Report 78-450, 124 p.
Loney, R.A., Brew, D.A., Muffler, L.J.P., and Pomeroy, J.S., 1975, Reconnaissance geology of Chichagof, Baranof, and Kruzof Islands, southeastern Alaska: U.S. Geological Survey Professional Paper 792, 105 p.
U.S. Bureau of Land Management, 2002, Alaska mineral locations database report (Sitka quadrangle), July 2, 2002, 205 p. [http://imcg.wr.usgs.gov/dem.html]
|Reporters||Donald Grybeck (U.S. Geological Survey)|
|Last report date||5/5/2005|