LKAB mine workers use closed circuit monitors and remote control joysticks to operate mining equipment, in this photo taken in Kiruna December 27, 2006. More than half of the town will be relocated in the coming years due to its place atop the world's largest underground mine. Kiruna, Sweden's northernmost municipality, is under threat as cracks caused by decades of iron ore mining slowly erode its foundations. Picture taken December 27, 2006. To match feature ARCTIC-TOWN/ REUTERS/Bob Strong (SWEDEN)