Quincy Mine

The Quincy Mine is an extensive set of copper mines located near Hancock, Michigan. The mine was owned by the Quincy Mining Company and operated between 1846 and 1945, although some activities continued through the 1970s. The Quincy Mine was known as "Old Reliable," as the Quincy Mine Company paid a dividend to investors every year from 1868 through 1920. The Quincy Mining Company Historic District is a U.S. National Historic Landmark District;^[2][3] other Quincy Mine properties nearby, including the Quincy Mining Company Stamp Mills,^[5] the Quincy Dredge Number Two,^[6] and the Quincy Smelter are also historically significant.

• http://en.wikipedia.org/wiki/Quincy Mine
• Page 88 - Dicka, A. B., 2012, 101 American Geo-sites you've gotta see: Mountain Press Publishing Co., 250p.