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Provisions, contingent liabilities and other liabilities (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of provisions [Line Items]    
Balance at beginning of the year $ 294,507  
Changes (additions and deductions) 50,798  
Accretion expense 6,848  
Disbursements (26,722)  
Sale of mining unit (5,093)  
Balance at end of the year 320,338 $ 294,507
Classification by maturity [Abstract]    
Current portion 68,000 72,771
Non-current portion 252,338 221,736
Closure Of Mining Units And Exploration Projects [Member]    
Disclosure of provisions [Line Items]    
Balance at beginning of the year 252,305  
Changes (additions and deductions) 32,200  
Accretion expense 6,848  
Disbursements (8,571) (16,882)
Sale of mining unit (5,093)  
Balance at end of the year 277,689 252,305
Classification by maturity [Abstract]    
Current portion 32,462 35,280
Non-current portion 245,227 217,025
Bonus To Employees And Officers [Member]    
Disclosure of provisions [Line Items]    
Balance at beginning of the year 19,226  
Changes (additions and deductions) 13,106  
Accretion expense 0  
Disbursements (15,119)  
Sale of mining unit 0  
Balance at end of the year 17,213 19,226
Environmental Liabilities [Member]    
Disclosure of provisions [Line Items]    
Balance at beginning of the year 6,305  
Changes (additions and deductions) (211)  
Accretion expense 0  
Disbursements (1,056)  
Sale of mining unit 0  
Balance at end of the year 5,038 6,305
Safety Contingencies [Member]    
Disclosure of provisions [Line Items]    
Balance at beginning of the year 5,205  
Changes (additions and deductions) (598)  
Accretion expense 0  
Disbursements (71)  
Sale of mining unit 0  
Balance at end of the year 4,536 5,205
Labor Contingencies [Member]    
Disclosure of provisions [Line Items]    
Balance at beginning of the year 3,777  
Changes (additions and deductions) 442  
Accretion expense 0  
Disbursements (139)  
Sale of mining unit 0  
Balance at end of the year 4,080 3,777
Obligations With Communities [Member]    
Disclosure of provisions [Line Items]    
Balance at beginning of the year 3,509  
Changes (additions and deductions) 96  
Accretion expense 0  
Disbursements 0  
Sale of mining unit 0  
Balance at end of the year 3,605 3,509
Tax contingencies    
Disclosure of provisions [Line Items]    
Balance at beginning of the year 382  
Changes (additions and deductions) 2,728  
Accretion expense 0  
Disbursements 0  
Sale of mining unit 0  
Balance at end of the year 3,110 382
Environmental contingencies    
Disclosure of provisions [Line Items]    
Balance at beginning of the year 1,500  
Changes (additions and deductions) 1,640  
Disbursements (266)  
Balance at end of the year 2,874 1,500
Board of Directors' participation [Member]    
Disclosure of provisions [Line Items]    
Balance at beginning of the year 1,594  
Changes (additions and deductions) 1,493  
Accretion expense 0  
Disbursements (1,500)  
Sale of mining unit 0  
Balance at end of the year 1,587 1,594
Workers' profit sharing payable    
Disclosure of provisions [Line Items]    
Balance at beginning of the year 69  
Changes (additions and deductions) 57  
Accretion expense 0  
Disbursements 0  
Sale of mining unit 0  
Balance at end of the year 126 69
Other Provisions    
Disclosure of provisions [Line Items]    
Balance at beginning of the year 635  
Changes (additions and deductions) (155)  
Accretion expense 0  
Disbursements 0  
Sale of mining unit 0  
Balance at end of the year $ 480 $ 635