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Ancient Ore Washerie near the legendary Mines of Laurium, Greece
An ore washerie was used for separating the silver out of smelted lead ore. The process is called cupellation. Water would be sluiced around in buckets and the little teeth like impressions would catch the waste and the precious metals would be easier to extract from the top.
Deposits of metal ore are common in Greece. Of these, the best known are the silver mines of Laurium. These mines contributed to the development of Athens in the 5th century BC, when the Athenians learned to prospect, treat, and refine the ore.