JIM WEST / SCIENCE PHOTO LIBRARY JIM WEST / SCIENCE PHOTO LIBRARY
Engine house at Soudan Mine, Minnesota. Machinery in the engine house of the former U.S. Steel Soudan iron ore mine, now the Soudan Underground Mine State Park. The engine house contains hoisting equipment to lower visitors into the mine. Visitors can descend half a mile underground to tour the mine or visit the Soudan Underground Laboratory. The laboratory houses particle physics experiments, including MINOS (Main Injector Neutrino Oscillation Search), designed to study the phenomena of neutrino oscillations.
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