Place the ingot in the leftmost slot and your Ceramic Tool/Weapon Mold in the center slot. The arrow will progress and you will end up with your filled tool/weapon mold on the right, and if it didn't break, the empty ceramic mold on the left.
Place the filled mold in a crafting grid to remove the head. The empty mold will be lost in the process.
Smithing with Black Bronze
Smithing Materials
Input
Work Type
Output
Unshaped Black Bronze
Hammer
Black Bronze Ingot
Black Bronze Ingot
Weld
Black Bronze Double Ingot
Black Bronze Double Ingot
Hammer
Black Bronze Sheet
Black Bronze Sheet
Weld
Black Bronze Double Sheet
Tools
Black Bronze Ingots are worked on an Anvil to make the heads for: