|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 on northeast Baranof Island is at sea level on the southwest shore of Portage Arm. The occurrence is 0.2 mile northeast of the center of sec. 23, T. 52 S., R. 65 E. It is location 60 of Cobb (1972, 1978). Several of the old publications include this with the Brown prospect which is on Admiralty Island some distance away (SI163). 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). There is little information on this occurrence other than that it consists of quartz veins and siliceous rocks that contain chalcopyrite, covellite, and bornite. (Loney and others, 1963).
|Geologic map unit||(-134.94146121655, 57.3522605852616)|
|Age of mineralization||Triassic or younger based on the age of the host rock.|
|Workings or exploration||Only limited surface sampling by government geologists.|
|Indication of production||None|
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.
|Reporters||Donald Grybeck (U.S. Geological Survey)|
|Last report date||5/5/2005|