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Contingencies and Capital Commitments (Narrative) (Details)
$ in Thousands, S/ in Millions
 1 Months Ended 12 Months Ended
Nov. 17, 2021
USD ($)
Oct. 07, 2021
USD ($)
Jan. 31, 2021
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2021
PEN (S/)
Dec. 31, 2020
USD ($)
Jan. 19, 2022
USD ($)
Nov. 16, 2021
USD ($)
Jan. 31, 2020
USD ($)
Disclosure of other provisions [line items]                  
Tax expense (income)       $ 47,781   $ 37,402      
Potential early payment termination amount       7,800          
Civil Work [Member]                  
Disclosure of other provisions [line items]                  
Capital commitments       1,300          
Equipment Purchases [Member]                  
Disclosure of other provisions [line items]                  
Capital commitments       5,200          
Construction Related [Member]                  
Disclosure of other provisions [line items]                  
Capital commitments       71,800          
Capital commitment amounts expected to be expended within one year       66,400          
Proposal Of Cancelling Mining Concession [Member]                  
Disclosure of other provisions [line items]                  
Claimed Royalty                 $ 30,000
Claimed royalty payment   $ 9,600              
PERU                  
Disclosure of other provisions [line items]                  
Payment of disputed amount       1,100 S/ 4.3        
PERU | Assessed in Prior Period [Member]                  
Disclosure of other provisions [line items]                  
Income tax interest and penalties       600 2.4        
Payment of disputed amount       1,200 S/ 4.3        
Caylloma Mine [Member]                  
Disclosure of other provisions [line items]                  
Undiscounted closure costs $ 15,400   $ 11,400            
Progressive closure activities     3,500            
Final closure activities 8,300   7,200            
Post closure activities $ 1,900   $ 800            
Guarantees with government current year               $ 9,700  
Security bond               1,500  
Bank letter of guarantee               $ 8,400  
Caylloma Mine [Member] | Received New Bank Letter Of Guarantee [Member]                  
Disclosure of other provisions [line items]                  
Guarantees with government next year             $ 10,800    
San Jose Mine [Member]                  
Disclosure of other provisions [line items]                  
Guarantees with government current year       $ 1,200