Charcoal was the fuel for the furnace. Colliers consumed 1,000s of acres of trees to make the charcoal. The charcoal hearth was about 20' across and covered with leaves & dirt and when lit, burned slowly producing charcoal after about a week.
Pig iron was the base iron product produced to make other wrought iron materials.
Franklin stoves. One of the most important products of the late 18th century
Hopewell also produced cannons for Washington's Army at Valley Forge about 30 miles away.