Soudan Underground Mine State Park
· Hand picks and sledge hammers give way to power tools and tunnels wired for electricity. Evidence remains of the steam boiler that once powered the mine before it transitioned to compressed air and electricity. The Soudan Mine remains in operation between 1885 and 1962. At its height in 1893, the mine employs 1,800 men and ships 568,000 long tons of highgrade ore. The Soudan Mine defines .