Floatation Floor These machines circulated water through the powder from the ball mills. Gold and silver is heavier than gravel, so it sinks while the junk rock floats. Similar Images ...based on the tags: belts, machinery, pipes, pulleys, rusty... One thing that made the Eagle Mine unique is the underground mill, left of this picture. As the rocks moved down the mill, they would be turned into finer and finer powder. One of a few rolling workbenches to keep the thousands of pulleys, cogs, and belts working properly. Between the gauges for the power plant boilers and the steam pump flywheels. This side of the mill, which abuts the Great Miami River, is much older than the other side of B Street. You can tell it went through many revisions. A side view of the floatation level. I found it interesting that there were little ladders and staircases in the mill to help workers get around–this place was not as shoddy as other mills I’ve seen. A light-painted portrait of one of the few remaining carts that moved everything from fresh eggs to soiled laundry through the tunnels. Copper poured from this furnace and was cast by the autocaster on the right into billets. A dead work truck rusts near an outbuilding. Everything is marked with a code. Modernity. Goop and slop slip to drop in the shame drain.