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Bunker Hill Lead Smelter, Bradley Rail Siding, Kellogg, Shoshone County, Idaho

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In foreground, from left to right, plant dry, slag fuming plant, blast furnace, smelter office, lead and silver refineries are visible. High-velocity flue leads from the lower plant to the bag house and stacks at the top of the smelting facility. (Created by Shauna Hillman, 1993. Courtesy of the U.S. Library of Congress, Prints and Photographs Division, Washington, D.C. Public domain.)