Dark, dusty, and dangerous. Those are the words that could have described the Soudan Iron Mine in Northern Minnesota during its operation. Each day workers would take elevators thousands of feet below the surface of the earth to roam the 54 miles of tunnels and mine its rich veins. My grandfather was one of those workers. When she was an adult, and after my grandfather had retired, my mom toured the mine. At one point, the tour guide extinguished his light putting Mom and the other tour members in complete darkness…