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Significant Judgements in Applying Accounting Policies Disclosure of significant accounting policies (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Disclosure of detailed information about property, plant and equipment [line items]    
Deferred credit $ 20,788 $ 20,788
Deferred Stripping Costs [member] | Dolores mine [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Deferred stripping costs 23,500 40,700
Deferred Stripping Costs [member] | La Arena mine [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Deferred stripping costs $ 41,000 $ 32,900