Hot Metal Trench The working end of the blast furnace, where molten metal would flow like lava out of the furnace… a process called ‘tapping’. Related Similar Images ...based on the tags: circles, cranes, ditches, furnaces, graffiti, machinery, pipes... Unloading boats had the option to take on fuel at Taconite Harbor. This building, among other things, pumped fuel to the dock. Serve [unknown] Build… What do you think the middle says? Tell me in the comments. An impressive message for graffiti in a Detroit warehouse, but then again look at these steam pumps. Over-built and under-appreciated. Around the corner from the old boiler room. This belt-run axle ran a turbine (now gone) to blow fresh air into the mine. Looking across a skyway at the dust-collecting funnels, one of the few pieces of equipment that haven’t been completely decimated by time and the elements. This is the crane that would be used to lower extra-heavy bits of copper ore into the fire of the furnace. These pools looked into the cribbing below the concrete. Easier-to-demolish parts of the power plant were torched apart. Catwalks to nowhere meant lots of dead ends.