Iron ore Iron ore is the principle material used to manufacture steel. Mapping coastal mines as a Great Lakes stressor. The final GLEAM stressor layer for mines considers all metal mines For example, Calcite Quarry located near Rogers City, MI, on the shore of Lake Huron is the worlds largest limestone mine.
Iron ore – Iron ore is the principle material used to manufacture steel. In 2011, mines in Minnesota and Michigan shipped 99% of the usable iron ore produced in the U.S. 3 Limestone – Limestone is often crushed and used for road construction projects, to manufacture cement, and as a component in the steel-making process.