Thirty-five years ago this month, an explosion at the Dutch Creek No. 1 Mine outside of Redstone, Colo. killed 15 coal miners. Rob Mulford worked at the mine. He wasn't there that day, but the weight of the tragedy is still with him. Mulford now lives in Alaska, but he recently came back Colorado, to honor his friends and fellow miners who died. He joined KVNF's Laura Palmisano in the studio to talk about the tragedy and a book he's writing.