Tilden Iron Mine, Michigan

Upper peninsula iron ore mine that has the capacity to produce eight million tons of iron ore pellets annually, one of the largest producers in the world. The operation employs around 850 people. A 1,400 acre reservoir and a similarly sized tailings basin were constructed in the area for the mine. The reserves are owned by the Cleveland-Cliffs Iron Company, and the series of open pit mining operations is owned by Cleveland-Cliffs, Algoma Steel, and Stelco. The ore pellet is used by the steel industry to produce steel.