Treasure Mountain Concentrator The purpose of the concentrator was to separate the gold and silver-rich ore from the waste rock. You can tell from the design that the process relies heavily on gravity. Similar Images ...based on the tags: clouds, mountains, sepia, snow, trees... Looking out across the elevator row from Portland Huron’s roof. Don’t you love the color of the sky? A rusting disconnect gangway. The smokestack is for a boiler, if I recall. There is no denying that the Fergus Falls asylum was a beautiful place, especially around sunset. I included this image to illustrate the height of the headgrame and the distance between it and the hoist house. Of course, compared with the depth of the mine shaft, this distance is short. Sidewalks to a boarded barracks, each making the other obsolete in the night. While the stokers are gone, the pipes bringing pulverized coal down were left. Storms and waves, focused by the Port of Wisconsin entry have focused the faces to tear-up these boards below. The most derelict of the old bonded warehouses. Note the barrel elevator on the side of it! From left to right: shaft building, headframe, rock house, hoist house.