Soudan Underground Mine State Park, Soudan

4.9
#10 of 85 in Nature in Minnesota
The Soudan Underground Mine State Park is a Minnesota state park at the site of the Soudan Underground Mine, on the south shore of Lake Vermilion, in the Vermilion Range (Minnesota). The mine is known as Minnesota's oldest, deepest, and richest iron mine, and now hosts the Soudan Underground Laboratory. As the Soudan Iron Mine, it has been designated a U.S. National Historic Landmark.HistoryIn the late 19th century, prospectors searching for gold in northern Minnesota discovered extremely rich veins of hematite at this site, often containing more than 65% iron. An open pit mine began operation in 1882, and moved to underground mining by 1900 for safety reasons. From 1901 until the end of active mining in 1962, the Soudan Mine was owned by the United States Steel Corporation's Oliver Iron Mining division. By 1912 the mine was at a depth of 1,250 feet (381 m). When the mine closed, level 27 was being developed at 2,341 feet (713.5 m) below the surface and the entire underground workings consisted of more than fifty miles of drifts, adits, and raises. In 1965, US Steel donated the Soudan Mine to the State of Minnesota to use for educational purposes.The primary underground mining method used was known as cut and fill. This involved mining the ceiling and using Ely Greenstone and other waste rock to artificially raise the floor at the same rate as the ceiling was being mined out. As a result, the floor and ceiling were always 10–20 feet (3–6 m) apart, and waste rock never had to be hauled to the surface, since it was recycled. This technique was particularly suited to the Soudan Mine due to the strength of the hematite formations and the weakness of the encasing Greenstone. This method was not possible in the nearby mines in Ely because the iron formations there were fractured and thus were not as structurally stable as those at Soudan.
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Soudan Underground Mine State Park Reviews
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  • September 14, 2017
    5 adults and two small children went on this tour and had a great time. The elevator down 2,300 feet was the first interesting part and the underground train and tour was excellent. I highly recommend...  more »
  • August 23, 2017
    We had the opportunity to go on the tour with the guide by the name Karel. He was a native Dutchmen that was retired from the mining industry. His knowledge of the Soudan Mine was exceptional as well ...  more »
  • August 23, 2017
    This tour was really cool! They take you 1/2 mile down into the earth on the elevator used by the miners (some safety features added - like doors) and then you ride mine cars another 3/4 mile back int...  more »

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