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Inventories, net - Additional information (Details) - El Brocal
$ in Millions
 12 Months Ended
Dec. 31, 2020
USD ($)
T
Dec. 31, 2019
USD ($)
T
Inventory, net    
Production in Process | $ $ 32.2 $ 31.2
Products in process of quantity | T 1,527,521 1,592,905