Autor:	Rosemeyer, Tom
Předmět:	MANGANESE mines & mining MINERALOGY HISTORY of mines & mineral resources MANGANESE oxides
Zdroj:	Rocks & Minerals; Nov/Dec2014, Vol. 89 Issue 6, p498-515, 18p
Abstrakt:	The article focuses on the history and mineralogy of the manganese mine in Keweenaw County, Michigan. The mine is one of the two manganese oxide deposits in the Keweenaw Peninsula which is situated in a densely forested area. The mine is believed to have been discovered by Dr. Douglass Houghton, the first state geologist of Michigan.
Databáze:	Complementary Index
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