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Inventories (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of inventories [Line Items]    
Total inventories $ 430,546 $ 370,716
Less: current portion of inventories (406,191) (346,507)
Non-current portion of inventories 24,355 24,209
Costs of inventories recognized as expense 978,635 1,121,471
Production costs 696,672 841,297
Depreciation and amortisation expense 254,469 253,453
NRV adjustments to inventory (16,200) (400)
Inventories, at net realisable value 215,500 151,500
Escobal mine [member]    
Disclosure of inventories [Line Items]    
Supplies 17,100 16,900
Concentrate [member]    
Disclosure of inventories [Line Items]    
Total inventories 19,104 17,433
Stockpile ore [member]    
Disclosure of inventories [Line Items]    
Total inventories 30,063 27,708
Non-current portion of inventories 2,700 1,200
Stockpile ore [member] | Manantial Espejo and Dolores mines [member]    
Disclosure of inventories [Line Items]    
Impairment charge   5,000
Stockpile ore [member] | Manantial Espejo mine [member]    
Disclosure of inventories [Line Items]    
Impairment charge 2,000  
Heap leach and in process [member]    
Disclosure of inventories [Line Items]    
Total inventories 219,334 169,751
Non-current portion of inventories 147,000 74,500
Heap leach and in process [member] | Manantial Espejo and Dolores mines [member]    
Disclosure of inventories [Line Items]    
Impairment charge 26,200 39,300
Dore and finished [member]    
Disclosure of inventories [Line Items]    
Total inventories 77,489 67,820
Dore and finished [member] | Manantial Espejo and Dolores mines [member]    
Disclosure of inventories [Line Items]    
Impairment charge   2,900
Dore and finished [member] | Dolores mine [member]    
Disclosure of inventories [Line Items]    
Impairment charge 2,900  
Materials and supplies [member]    
Disclosure of inventories [Line Items]    
Total inventories $ 84,556 $ 88,004