The Mineral Range Railroad (reporting mark MRA) is a small railroad located in the Upper Peninsula of Michigan. It started operating in 2002 on a three-mile industrial track that connected Ishpeming to National Mine. This track was built to transport materials to an explosives plant. In 2012, the railroad expanded by adding 12 miles of old rail lines that were previously used by Canadian National between Ishpeming and Humboldt. This expansion helped the railroad serve the Eagle Mine concentrating plant.

The Humboldt Mill was reopened in 2014 and is now operated by Eagle Mine, which is owned by Lundin Mining. The mill was first opened in 1954 by Cleveland-Cliffs Inc. and was managed by them until 1979. From 1985 to 1990, the Callahan Mining Company used the mill to process gold from the Ropes Gold Mine in Ishpeming, Michigan. After several changes in ownership, Eagle Mine began using the mill in 2014 to extract nickel and copper.

The main type of traffic on the Mineral Range Railroad is nickel and copper ore concentrates.