Siskowit Mine, Isle Royale National Park, Lake Superior, Keweenaw Co., Michigan, USA

Ref.: U.S.G.S. PP 144

An underground copper mine in Isle Royale National Park. The mine consists of 4 shafts, 1 adit, and 4 levels. Work began at this location in 1845. In 1847, the Siskowit Mining Association commenced operations on the property. The Siskowit Mining Co. took over operations in 1849 and ran the mine until it closed in 1855. The mine produced 190,000 lbs. of refined copper. No collecting is allowed at this site.