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Contingencies and Capital Commitments (Narrative) (Details)
S/ in Thousands
 12 Months Ended
Dec. 31, 2019
PEN (S/)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
Jan. 31, 2020
USD ($)
Disclosure of other provisions [line items]          
Security bond   $ 1,300,000      
Bank letter of guarantee   8,394,000      
Capital commitments   24,467,000 $ 111,940,000    
Tax expense (income)   20,175,000 33,350,000    
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 1,310,000      
Income tax interest and penalties 2,405 725,000      
Payment of disputed amount S/ 4,343 1,310,000      
Mineral Properties [member] | Civil Work [Member]          
Disclosure of other provisions [line items]          
Capital commitments   36,454,000      
Mineral Properties [member] | Equipment Purchases [Member]          
Disclosure of other provisions [line items]          
Capital commitments   510,000      
Mineral Properties [member] | Other Services [Member]          
Disclosure of other provisions [line items]          
Capital commitments   124,000      
Caylloma Mine [Member]          
Disclosure of other provisions [line items]          
Undiscounted closure costs     11,431,000    
Progressive closure activities     3,646,000    
Final closure activities     7,156,000    
Post closure activities     $ 790,000    
Guarantees with government current year   7,237,000      
Guarantees with government next year   9,704,000      
San Jose Mine [Member] | Environmental obligations [Member]          
Disclosure of other provisions [line items]          
Bank letter of guarantee   $ 1,236,000      
Number of letters of guarantee   3      
Provision for credit commitments [member]          
Disclosure of other provisions [line items]          
Bank letter of guarantee   $ 7,237,000