Structural control of ore deposition at Kasaan Peninsula, southeastern Alaska

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Copper‐bearing magnetite deposits and associated copper deposits at Kasaan Peninsula, Prince of Wales Island, southeastern Alaska, have been known for many years and have been mined to some extent for their copper content. At the beginning of World War II, the development of war industries in the Pacific northwest focused attention on the deposits as possible sources of iron ore. From 1942 through 1944 the United States Geological Survey made detailed studies of most of the ore deposits and at a few of the more promising localities diamond‐drilling operations were carried on by the United States Bureau of Mines. The deposits are for the most part small and irregular but of relatively high grade. The chief ore minerals are magnetite, pyrite, and chalcopyrite, and the gangue consists largely of skarn minerals, including garnet, epidote, diopside, and hornblende. The deposits are presumably of pyrometasomatic origin, but whereas deposits of this type are commonly replacement bodies in limestone, at Kasaan Peninsula limestone seemingly was a poor host rock for the ore.

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Publication type Article
Publication Subtype Journal Article
Title Structural control of ore deposition at Kasaan Peninsula, southeastern Alaska
DOI 10.1029/TR027i005p00712
Volume 27
Issue 5
Year Published 1946
Language English
Publisher American Geophysical Union
Description 1 p.
First page 712
Last page 712
Country United States
State Alaska
Other Geospatial Kasaan Penninsula
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