Concentrators Inside the pilot copper concentrator. Related Similar Images ...based on the tags: machinery, tanks... The workshop sat below the main working floor and had serious power going to it. Gilman had a bowling alley. From inside a painting shed, where heatlamps and a vented roof made sure that the Caddy looked like it was worth the price tag. Installed in 1904 at the center of the plant, this is one of two batteries of boilers. Being in Oshkosh, heat was very important to keeping labor moving in the cold months. A dead belt-o-vator. A better view of the belt system that drives all the machinery in the plant. This movable chute came off its rails. I tried to hide the graffiti from my photos, but sometimes it wasn’t possible. 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.