Find Events at Hopewell Furnace National Historic Site
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National Park Service - Events+ Expanded View
November 2009
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Did You Know?
"Slag" was the waste material created during Hopewell Furnace's iron smelting process. It consisted of residual minerals in the iron ore that remained after the iron had been removed. Often it appears glassy and multicolored, a combination of minerals such as copper, nickle and manganese.