Delaware Mine

The Delaware Mine is located off U.S. Highway 41, 12 miles (19 km) in Grant Township, Keweenaw County, south of Copper Harbor, Michigan and is a Keweenaw Heritage Site. The Delaware Copper Mine provides tours of one of the oldest copper mines in the Keweenaw,^[1] dating back to 1846.^[2] The mine had five shafts, with the deepest reaching 1,400 feet (430 m).^[2] The mine is open June through October and offers guided and self-guided tours.^[2]

• http://en.wikipedia.org/wiki/Delaware Mine