'Smelter' in the Bible

To an idol?—something that a smelter casts,and a metalworker plates with goldand makes silver welds for it?

So the craftsman encourages the smelter,And he who smooths metal with the hammer encourages him who beats the anvil,Saying of the soldering, “It is good”;And he fastens it with nails,So that it will not totter.