The pot ash was also kept in this location. This was an oven where the pots about to be used in the main furnace were preheated. This building measured approximately 45 feet by 70 feet and stood 15 feet high. It was constructed of sandstone and aggregated stone and cemented with limestone mortar. All four walls of this structure were once peirced with large arched openings set in brick.
Pictures reveal it was once topped with a sloping wooden roof.
The melting furnace is the best preserved of the three above ground sites. This structure stood directly north of the Melting Furnace site. It was built of the same sandstone material as the melting house, repeating the same brick arched openings. The roof was most likely wood, although no evidence of this remains. The only standing wall surface is the southwest corner that contains two window openings with the original pegged mortise and tenon lintel.