Minnesota Mine

Which is in Douglas County, Nevada, despite the name! This mine started as a copper operation in the 1920s, but became much more productive as an iron mine, from the early 1950s to ca. 1970. The mineralization was a magnetite (Fe3O4) body of metamorphic origin. The mine was an open pit, as can be seen. The inset shows a close up of the pit lake in the bottom of the mine. It shows how dry the country is, that the pit lake is so small!