Finding the necessary components nearby for smelting iron (water, limestone and timber for charcoal), Grubb built the Cornwall Iron Furnace and began production in 1742. The operation also included the Hopewell Forges on nearby Hammer Creek. Peter Grubb did not stay long to run the operation, but leased it out in 1745 for 20 years and returned to Wilmington, Delaware. In 1765, Peter's sons Curtis and Peter Jr. took over the operation, and in 1798 it passed to Robert Coleman and his family. Cornwall Furnace was in production from 1742 until 1883, and appears today much as it was when production ended. In 1932 the Coleman family deeded the property to the Commonwealth of Pennsylvania and it is now a designated National Historic Landmark open to the public.
Finding the necessary components nearby for smelting iron (water, limestone and timber for charcoal), Grubb built the Cornwall Iron Furnace and began production in 1742. The operation also included the Hopewell Forges on nearby Hammer Creek. Peter Grubb did not stay long to run the operation but leased it out in 1745 for 20 years and returned to Wilmington, Delaware. In 1765, Peter's sons Curtis and Peter Jr. took over the operation, and in 1798 it passed to Robert Coleman and his family. Cornwall Furnace was in production from 1742 until 1883, and appears today much as it was when production ended In 1932 the Coleman family deeded the property to the Commonwealth of Pennsylvania and it is now a designated National Historic Landmark open to the public.