|Quadrangle map, 1:250,000-scale||SI|
|Quadrangle map, 1:63,360-scale||B-3|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||This occurrence is at sea level on the southwest shore of Catherine Island, about 1.8 miles north-northwest of North Point. The occurrence is 0.7 mile south-southwest of the northeast corner of sec. 32, T. 52 S., R. 66 E. It is location P-101 of Bittenbender and others (1999) and MAS no. 0021140153 (U.S. Bureau of Land Management, 2002). The location is accurate within 0.5 mile.|
Geologic descriptionThe rocks in the vicinity of this occurrence are part of the Jurassic and/or Triassic, Kelp Bay Group which consists of phyllite, quartzite, greenschist, greenstone, graywacke, and semischist (Loney and others, 1975). The rocks in this area are marked by the development of an intense cataclastic foliation. Bittenbender and others (1999) collected 5 samples along the shoreline of quartz veins that contain rare chalcopyrite, pyrite, and up to 2 percent pyrrhotite. The samples contained less than 5 parts per billion gold and up to 4,060 parts per million copper; all other of the common metallic elements were at background level.
|Geologic map unit||(-134.856758388375, 57.3154629260983)|
|Mineral deposit model||Quartz vein with copper minerals.|
|Age of mineralization||Triassic or younger based on the age of the host rock.|
|Workings or exploration||Apparently only sampling by government geologists.|
|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., Berg, H.C., Pomeroy, J.S., and Brew, D.A., 1963, Reconnaissance geologic map of Chichagof Island and northwestern Baranof Island, Alaska: U.S. Geological Survey Miscellaneous Geologic Investigations Map I-388, 1 sheet, scale 1:250,000.
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|