I believe these hooks were meant for hanging filters to dry.
One of the many fireproof bridges connecting the factory sections, one way to prevent fires from spreading throughout the plant.
This might have been part of the Pioneer Pellet Plant. It looks to be a ball mill, which pulverizes ore by spinning it with thousands of ball bearings.
Miller Creek, in one of the wider sections that features a trout (as in the fish) canal in the middle of the drain. Even though it is underground, the fish are able to visit their breeding ponds upstream by swimming through the specially designed tunnel.
The ruins of the the Hubert Mine over the ruins of Nevadaville. Its ore was taken through the town to a mill below it.
The dredge is divided into four levels. The top level has controls for the tailings boom and, when it was there, the bucket excavator.
Chutes from a hundred machines interconnect to more machines and chutes on a dozen factory floors.
The bottom of the tailings boom is rotten. In days when the dredge, floated, gangways connected it to shore, it seemed. You can see the size of the pontoons under the boat here.
The the left, the nitrating line in War City. To the right, War City’s sole suburb, Charlestown, IN.