Can you tell me what a melder did in the middle colonines?

In the middle colonies during the 17th and 18th centuries, a melder was typically involved in the processing of metals, particularly in the production of iron. They operated furnaces and forges, melting raw materials to create iron products such as tools, nails, and hardware essential for daily life and agriculture. Melders played a crucial role in the burgeoning economy of the colonies by supporting both local needs and trade. Their skills were vital in areas like Pennsylvania, where iron production was a significant industry.