The refined copper is placed in a crucible inside a furnace and melted. Nearby a tub is kept ready full of hot water. When the copper has melted, slag is removed and the fire extinguished. Hot water is poured into the trough and the mold is filled separately to the brim with extremely hot water. Then the melter lifts out the crucible with a pair of large iron tongs and pours the copper into the mold.
Cold water is sprinkled on the copper after casting to let it cool and congeal.
The copper is lifted out with small iron tongs. About ten or so pourings will exhaust the crucible. Ten or so cruciblefuls are melted in one day. If the pure copper above is not to be alloyed, then the refining process is hereby concluded. In some cases refined copper is cast into round or square molds.