Direct answer
Deposit your raw ore in this furnace and it will melt away all impurities, leaving you with a bar of refined metal to work at the forge. You will need coal to fuel the smelter. Coal can be produced by building a kiln and loading it with wood.
Charcoal Kiln · Building

Result
Build a structure: Charcoal Kiln → Use the structure or item: Smelter / Copper Ore ×1 / Coal ×2
Game homeValheimAll games


