07/22/2026
Hill Annex Mine was once one of Minnesota’s largest natural ore producers, and Calumet Reclamation Company will build on that legacy.
During World War II, as demand for iron surged, Hill Annex helped recover as much valuable material as possible. The highest-grade ore was processed first to meet urgent wartime needs. At the same time, other iron-bearing material was sorted, stockpiled, and preserved on the surface for future use.
Those legacy stockpiles are part of Hill Annex history. They reflect a period of extraordinary production on the Iron Range, when mines across the region helped supply the iron behind the Allied war effort.
Hill Annex also shows how recovery methods kept changing over time. A wash plant was built at the mine in 1920, and heavy-media separation was added later as the site continued working to recover more iron.
At Calumet Reclamation Company, our work begins with that legacy. CRC will reclaim legacy stockpiles and recover high-grade iron ore for a new role in domestic steel production.
⛏️ We would love to hear your stories about Hill Annex in the comments.