How gold and silver are refined
The refining of gold and silver consists of the following stages:
Evaluation melting. The raw bullion is melted in a crucible, and dip samples are taken to determine its content of gold, silver and other elements.
Chlorination. Gold is separated from other elements, mostly silver and base metals. When this is done, the gold and silver are then cast for the next stage
Melting/casting to bars. The refined gold and silver are separately melted and cast into bars.