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Contingencies and Capital Commitments (Narrative) (Details)
S/ in Thousands
 1 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2018
USD ($)
Sep. 30, 2020
PEN (S/)
Sep. 30, 2020
USD ($)
Dec. 31, 2020
PEN (S/)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2017
Jan. 31, 2020
USD ($)
Disclosure of other provisions [line items]                
Security bond               $ 1,539,000
Bank letter of guarantee               8,394,000
Tax expense (income)         $ 37,402,000 $ 20,175,000    
SGM Royalty (as percentage)             3.00%  
Proposal Of Cancelling Mining Concession [Member]                
Disclosure of other provisions [line items]                
Claimed Royalty               $ 30,000,000
PERU                
Disclosure of other provisions [line items]                
Tax expense (income)       S/ 4,343 1,199,000      
Income tax interest and penalties       S/ 2,405 664,000      
Payment of disputed amount   S/ 4,343 $ 1,199,000          
Mineral Properties [member] | Civil Work [Member]                
Disclosure of other provisions [line items]                
Capital commitments     558,000          
Mineral Properties [member] | Equipment Purchases [Member]                
Disclosure of other provisions [line items]                
Capital commitments     386,000          
Mineral Properties [member] | Other Services [Member]                
Disclosure of other provisions [line items]                
Capital commitments     $ 134,000          
Caylloma Mine [Member]                
Disclosure of other provisions [line items]                
Undiscounted closure costs $ 11,719,000              
Progressive closure activities 3,774,000              
Final closure activities 7,156,000              
Post closure activities $ 789,000              
Guarantees with government current year         9,933,000      
San Jose Mine [Member] | Environmental obligations [Member]                
Disclosure of other provisions [line items]                
Bank letter of guarantee         $ 1,168,000      
Number of letters of guarantee         3