|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 end of Pond Island on the east side of 'The Basin' of Kelp Bay. The occurrence is 0.4 mile west-northwest of the center of sec. 15, T. 53 S., R. 66 E. It is location P-102 of Bittenbender and others (1999), location 64 of Cobb (1972, 1978), and MAS no. 0021140189 (U.S. Bureau of Land Management, 2002). The location probably is accurate within 0.2 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). Loney and others (1963) noted pyrite, chalcopyrite, covellite, and bornite in quartz veins and iron-stained siliceous rocks in this area. Bittenbender and others (1999) collected 3 samples of: 1) quartz veins in siliceous greenschist; 2) siliceous metavolcanic rocks with 1 percent pyrite; and 3) mudstone and tuff with up to 5 pyrite and pyrrhotite. Gold values were all less than 5 parts per billion and the highest copper value was 230 parts per million; all of the other common metallic elements were at background level.
|Geologic map unit||(-134.898157508828, 57.2700613299713)|
|Mineral deposit model||Quartz veins with copper minerals.|
|Age of mineralization||Triassic or younger based on the age of the host rock.|
|Alteration of deposit||Alteration noted but no details.|
|Workings or exploration||Apparently only surface 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|