Collapse and Columns Since this picture was taken, the roof has totally collapsed in this area. Related Similar Images ...based on the tags: black&white, collapsing, dark, pillars, stained-glass, sun-beams, windows... A winding flue between the ovens for Furnace 6, capped with sketchy catwalks. Copper poured from this furnace and was cast by the autocaster on the right into billets. Aluminum spools replaced their wooden counterparts, later in the factory’s history. A scribbled note on a doorframe… lost details. “R.O. 1939” Looking toward Mitchell from its last building. The main buildings were mostly interconnected and in good condition. The dry air helps to preserve the wooden structures. The right passageway is a carved staircase that winds upward to an old entrance. The left portal is one of the bigger and well-carved rooms… I would guess it’s part of the original caves. Wind blew taconite dust against the walls of these suspended control room, making even the glass appear to rust.