Soudan Mine

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The Soudan Underground Mine is described as Minnesota's oldest, deepest, and richest iron mine.
www.dnr.state.mn.us/state_parks/soudan_underground_mine...
The Soudan Mine was home to the Soudan I proton decay experiment and its successor, Soudan-II. The University of Minnesota and the Department of Natural Resources have expanded the laboratory to accommodate other physics projects, such as the currently active MINOS neutrino detector, and CDMS-II, a dark matter search experiment. Low-background materials screening facilities are in use and continuing development, and the mine has been proposed as one possible site for a U.S. Deep Underground Science and Engineering Laboratory. Parts of the laboratory are open for daily tours, and there is an annual open house with more access to the facilities and representatives of the experiments to help with the tours and answer questions.