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Keweenaw National Historical ParkQuincy Smelter site
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Keweenaw National Historical Park
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A piece of float copper sets on exhibit near the Calumet & Hecla general offices.  

Did You Know?
The largest known quantities in the world of pure, native copper were found on Michigan's Keweenaw Peninsula. In some cases, the deposits were up to 97% pure, requiring little chemical processing to produce ingots of pure copper.

Last Updated: August 22, 2006 at 09:14 EST