Both the Minorca and Hibbing mines are located in the Mesabi iron range where iron ore has been extracted for over 100 years. The ore bodies are within the Biwabik Iron Formation, a series of shallow dipping Precambrian sedimentary rocks known as taconite with a total thickness in excess of 200 meters and running for approximately 200 kilometers. Although the first deposits mined in the Mesabi iron range consisted of oxidized hematite ores, production was shortened in the mid-1950 to low grade magnetic taconite ores.

Mining is conducted on multiple mineral leases having varying expiration dates. Mining leases routinely are renegotiated and renewed as they approach their respective expiration dates. This operation includes a concentrating and pelletizing facility, along with two open pit iron ore mines - Laurentian, and East Pits - located approximately seven miles from the processing facilities.

The processing operations consist of a crushing facility, a three-line concentration facility and a single-line straight grate pelletizing plant. Pellets are transported by CN rail to ports on Lake Superior and shipped to Indiana Harbor located in East Chicago, Indiana.