Duluth, Missabe & Northern Boiler The Engine House’s boiler, which would have been fired all day all day, virtually from the day the shop opened until the day it closed. Similar Images ...based on the tags: boilers, coal, dirty, favorites, ghost-signs, light-painted, machinery, numbers, pipes, rusty, signs, steel, valves... Four A.M. was the best time to be on the main assembly line. This was about shortly after most of the machinery was removed. Next to the generator room is the pump room, which moved steam around the complex. The north side of the plant is modern 60s industrial architecture, meaning massive open spaces with no personality. This mirror is the most interesting thing I could find. …a better view of the huge tailings boom stretching outside of the tailings pond. The beeping never stopped. The robots never slept, not even when they were unplugged. It was a nightmare. At night the city lights blast through the broken windows, casting crazy colors through the off-white interior of the mill. The bottom of the elevator in the new foundry. One of two projectors, still set to run old 3D flicks. The whole smelter ran on gravity… elevating the various raw materials and working with them until at the bottom of the furnace, copper poured out.