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Impairment of Non-Current Assetes - Impairment (Charges) Reversals (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of impairment loss and reversal of impairment loss [line items]    
Period of analyst consensus prices used for economic impairment modeling 4 years  
Impairment loss recognised in profit or loss $ 0 $ 40,050
Reversals of impairment $ 0 (40,050)
Combined net carrying amount of Manantial Espejo mine and Joaquin and COSE development projects, net of associated closure and decommissioning liabilities   63,600
Combined estimated recoverable amount   $ 23,500
Risk adjusted discount rate   9.75%