Before the gold could be extracted, the rock was turned to powder. Depending on the size of the steel balls inside the mill, the rock would be reduced to a certain size. So, multiple mills were usually used in stages.
Inside the pilot copper concentrator.
On the upper floors where the sunlight is yellow–the color of flour dust, once exposed to the elements.
A wounded flour mill, muscled into the corner to keep out of the way.
This rod mill (?) was made in Denver Colorado at a factory now buried by condos. #justdenverthings
The final ball mill in the Chain O’ Mines concentrator. Behind it was a bucket of steel balls.
I tried to hide the graffiti from my photos, but sometimes it wasn’t possible.
A shallow creek traces Illinois Gulch toward the Chain O’ Mines mill. Ball mills are laid out in the sun.
One of the machines left over in the underground magnetic separation plant.
Tucked-into the side of the concentration mill… these machines were meant to crush underground rock into a fine dust for mineral extraction.
The right-pointing crank adjusts the rollers inside of the mill. How fine do you want your flour?
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.
When the building switched souls from booze to bread, these contraptions were mounted across the brewhouse floors… they’re not for hops, either.