|Quadrangle map, 1:250,000-scale||TI|
|Nearby scientific data||Find additional scientific data near this location|
|Location and accuracy||This site is the beach area on the north and northeast coast of Chirikof Island (MacKevett and Holloway, 1977, locality 3). The island is shown on an inset on the USGS Trinity Island 1:250,000 scale quadrangle map.|
Geologic descriptionBlack sands occur along the northeast coast and at the extreme north end of the island for a distance of approximately 10 miles (Gassaway, 1935). These sands commonly occur as thin surface crusts on the beaches near high-tide levels. Some crusts were also noted on local sand dunes. On the northern tip of the island a narrow strip of black sand about 6 inches thick and extending about 1/8 mile was noted. The presence of gold in the black sands was found to be very sporadic as indicated in panned samples taken by Gassaway.
|Geologic map unit||(-155.562237040351, 55.8992542578037)|
|Mineral deposit model||Gold placer (Cox and Singer, 1986; model 39a).|
|Mineral deposit model number||39a|
|Age of mineralization||Quaternary|
|Workings or exploration||The beach areas had been prospected prior to 1935 (Gassaway). U.S. Bureau of Mines claim map shows no apparent activity after 1950.|
|Indication of production||None|
Cobb, E.H., 1979, Summary of references to mineral occurrences (other than mineral fuels and construction materials) in the Afognak, Karluk, Kodiak, and Trinity Islands quadrangles, Alaska: U.S. Geological Survey Open-File Report 79-860, 49 p.
Gassaway, L.D., 1935, Report on black sand deposits of Kodiak Island: Alaska Division of Geological and Geophysical Surveys Miscellaneous Report 135-1, 10 p.
MacKevett, E.M., Jr., and Holloway, C.D., 1977, Map showing metalliferous mineral deposits in the western part of southern Alaska: U.S. Geological Survey Open-File Report 77-169-F, 38 p., 1 sheet, scale 1:1,000,000.
|Reporters||S.H. Pilcher (Anchorage)|
|Last report date||8/13/1998|