Short-stack remains of mounts for rod and ball mills, if I was to bet. The concentrator separated junk rock (tails) from the copper and silver ore, to such a point it could be smelted.
I wonder how polluted that water is.
Water at the bottom of the silo was perfectly clear.
This is what it might have looked like if a new Ford descended in the elevator with its headlights on. As seen from the Mississippi side–the opposite portal faces the sand mine.
2016. A section of the third floor that has changed a lot over the years. Compare to 2006 shot.
The orange bars were secured to the tunnel walls to support electric lines for the mine carts. Lower parts of the sand mines were allowed to flood. The water was perfectly still, and made for a mud so thick it could suck off your boots.
There’s concrete under that dirt… under that water… somewhere.
This picture shows the challenges of moving around underground in the base.
90% of Brach’s looks like this. Concrete walls, mushroom pillars, and water over the floor.