Built in 1742 by Peter Grubb near an immensely rich ore deposit and acres of forest for making charcoal fuel. a self-sufficient community included the ironmaster's mansion and workers' houses. The furnace produced pig iron and cast goods, and cannons for the revolutionary War. Sold in 1798 to entrepreneur Robert Coleman; operated until 1883. It survives fully intact a few miles east at Cornwall.

Marker is on U.S. 322 just from Pennsylvania Route 419.

Courtesy hmdb.org

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