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1-621: The Mineral Range Railroad (reporting mark MRA) is a shortline railroad in the Upper Peninsula of Michigan. It began operations in 2002. In 2012, it acquired an ex- Lake Superior and Ishpeming line between Humboldt Mill and Ishpeming. The Humboldt Mill was reopened in 2014 and is operated by Eagle Mine, owned by Lundin Mining . It was originally opened in 1954 by Cleveland-Cliffs Inc , who operated it until 1979. Between 1985 and 1990, Callahan Mining Company used it to process gold from