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Inventories - Additional information (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Inventory [Line Items]    
Cost of inventories recognised as expense during period $ 386,900 $ 367,310
Production costs 449,748 445,183
Depreciation charges   218,129
Gold, Lead, and Zinc Concentrate    
Inventory [Line Items]    
Production costs $ 0 2,122
Depreciation charges   $ 206