The gothic landing between balcony and classroom level and the ground floor.
One of the many blast doors. Note the plunger to seal off the airflow in the event of an attack or accidental explosion.
Looking at the side of 4B from the roof of its car shed.
In the mine offices, hooks and a board with numbers was the system to keep track of who was in the mine and who was safe.
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.
A sort of blender in a powder line building. The top vent had been removed, so leaves and light fall onto the teeth now.
A colorful boiler is a happy boiler! RotoGrate systems remove ashes from the boiler firebox by revolving the bottom of the system to let the fly ash drop into a hopper. This greatly increases boiler efficiency.
The only way to get to the second floor–since demolition crews punched-out the staircases and ladders leading upwards–was to climb this elevator shaft. In the lower-left corner is a blower for the foundry furnaces.
The mill is one of the tallest buildings in the city. It’s too bad that the cupola with its big skylights and flagpole were removed.