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.
I love that the administration building–almost 100 years old now–still carries the original name.
After crushing, these machines would float lighter material to the surface of the water, where it would be skimmed and discarded. Gold and silver laden stone would sink to the bottom, where it was collected for the next stage of processing. Leica/Summilux 35/Ektar 100
The light next to this acid tank was perfect, thanks to a gaping hole in the roof.
Water damage dissolved the ceiling into sludge. Pillars remain, as do the plastic light covers, now on the floor.
A massive water tower easily tucks into the shadow of Blast Furnace #6.
The east side of the boiler shop sported a platform with a control booth and heavy machine mounts. Note the door that replaces the lower section of stairs for explorers.
The old way to get to the elevator from the mill.
The power lines follow the street, down to the mineshaft. Everything revolved around the mine, it seemed.