Location and stability analysis of the Michigamme Underground Mine for the US-41 re-alignment in Marquette County, Michigan.
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2008-08-01
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Edition:Final report.
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Abstract:A proposed realignment of US-41 near Michigamme, Michigan will be located over an abandoned underground iron ore
mine. The mine, known as the Michigamme Mine, was started in 1872 and closed in 1901. Initial mining operations
were started in seven open pit mines but soon reverted to underground mining operations. There were at least ten
production and ventilations shafts constructed at the mine. While the general locations of the shafts are known, the
exact locations of some shafts are not. This is due in part to the filling in of the mine shafts with waste rock from the
mining operations. The purpose of this report was to determine the location of the shafts and to make an evaluation of
the stability of the surface with respect to the highway realignment. After investigating mine maps and historical
documents it was determined that the realignment will not be affected by the underground mines. The only issue noted
is that the highway will be adjacent to one of the shallower mine shafts. Mine maps indicate that this shaft is between
50 and 100 feet deep but filled with mine rock. The exact location of this mine shaft will need to be determined and
structurally stabilized.
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