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Inventories (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure of inventories [Line Items]    
Inventories $ 214,465 $ 218,715
Costs of inventories recognized as expense 683,598 648,068
Production costs 515,636 500,670
Depreciation and amortisation expense 147,289 122,888
NRV adjustments to inventory 24,300 12,300
Inventories, at net realisable value 143,600 125,500
Concentrate [member]    
Disclosure of inventories [Line Items]    
Inventories 19,286 11,582
Stockpile ore [member]    
Disclosure of inventories [Line Items]    
Inventories 3,945 16,209
Non-current inventories 2,500 9,500
Stockpile ore [member] | Manantial Espejo mine [member]    
Disclosure of inventories [Line Items]    
Impairment charge   (10,000)
Stockpile ore [member] | Manantial Espejo and Dolores mines [member]    
Disclosure of inventories [Line Items]    
Impairment charge 11,200  
Heap leach and in process [member]    
Disclosure of inventories [Line Items]    
Inventories 113,199 108,509
Non-current inventories 75,300 74,300
Heap leach and in process [member] | Manantial Espejo and Dolores mines [member]    
Disclosure of inventories [Line Items]    
Impairment charge 28,900 (10,300)
Dore and finished [member]    
Disclosure of inventories [Line Items]    
Inventories 30,736 35,054
Dore and finished [member] | Manantial Espejo mine [member]    
Disclosure of inventories [Line Items]    
Impairment charge   (2,900)
Dore and finished [member] | Manantial Espejo and Dolores mines [member]    
Disclosure of inventories [Line Items]    
Impairment charge 7,500  
Materials and supplies [member]    
Disclosure of inventories [Line Items]    
Inventories $ 47,299 $ 47,361