Spray Pond The rocket system used several cooling methods, once of which included an evaporation pond, pictured here. Similar Images ...based on the tags: fences, fountains, sepia, water, yellow... The underwater superstructure of the dock was visible through these big holes. 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. As my friend Jonathan would say, “on a human scale.” Some of the internal staircases were fitted with cages that wound round down the stairs to deter suicidal patients from taking a dive. A stern-mounted spotlight and a fleet of former US Army tugs that are still used to break ice and nudge ships into slips. Check that waterfall! A dedicated 13-acre rail yard operated by Canadian Pacific. As of 2016, it’s still there, and considered a factor in the redevelopment of the former plant site. The east portal, looking toward Nopeming Junction and away from the US Steel ruins and Duluth’s ore docks. A long tunnel stretches toward the Mississippi. Was this the route Model Ts took on their way to waiting barges?