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.
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...based on the tags: flywheels, graffiti, mills, pillars, pipes, rusty...
Above the offices is this little section of factory that still has strips of wood flooring. This may be where the upholstery was cut.
Boards on the window are like rings on a tree, if you know how to read abandonments.
A control panel that was mothballed, anticipating a time when the plant may be reactivated.
The doorframes become more askew every year as the buildings slip downward into the gulch at different rates. This seems to be the part of the mine ruins where transients leave their marks. The graffiti dated back to the 1970s, at least.
Between the gauges for the power plant boilers and the steam pump flywheels.
This drying house was full of ventilation ducts, broken scales, and insulated carts to haul powder around the line.
Looking up the rock house.
Rims where bulbs were, light were motors were, stairs were people were.
A rusting disconnect gangway. The smokestack is for a boiler, if I recall.