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Provisions, contingent liabilities and other liabilities (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of provisions [Line Items]    
Balance at beginning of the year $ 267,934  
Changes (additions and deductions) 58,102  
Accretion expense 10,656  
Disbursements (42,185)  
Balance at end of the year 294,507 $ 267,934
Closure Of Mining Units And Exploration Projects [Member]    
Disclosure of provisions [Line Items]    
Balance at beginning of the year 225,877  
Changes (additions and deductions) 32,654  
Accretion expense 10,656  
Disbursements (16,882) (25,830)
Balance at end of the year 252,305 225,877
Classification by maturity [Abstract]    
Current portion 35,280 30,524
Non-current portion 217,025 195,353
Bonus To Employees And Officers [Member]    
Disclosure of provisions [Line Items]    
Balance at beginning of the year 18,620  
Changes (additions and deductions) 15,855  
Accretion expense 0  
Disbursements (15,249)  
Balance at end of the year 19,226 18,620
Environmental Liabilities [Member]    
Disclosure of provisions [Line Items]    
Balance at beginning of the year 3,768  
Changes (additions and deductions) 3,944  
Accretion expense 0  
Disbursements (1,407)  
Balance at end of the year 6,305 3,768
Safety Contingencies [Member]    
Disclosure of provisions [Line Items]    
Balance at beginning of the year 4,877  
Changes (additions and deductions) 1,270  
Accretion expense 0  
Disbursements (942)  
Balance at end of the year 5,205 4,877
Labor Contingencies [Member]    
Disclosure of provisions [Line Items]    
Balance at beginning of the year 4,042  
Changes (additions and deductions) (258)  
Accretion expense 0  
Disbursements (7)  
Balance at end of the year 3,777 4,042
Obligations With Communities [Member]    
Disclosure of provisions [Line Items]    
Balance at beginning of the year 5,878  
Changes (additions and deductions) 1,306  
Accretion expense 0  
Disbursements (3,675)  
Balance at end of the year 3,509 5,878
Board of Directors' participation [Member]    
Disclosure of provisions [Line Items]    
Balance at beginning of the year 2,108  
Changes (additions and deductions) 1,736  
Accretion expense 0  
Disbursements (2,250)  
Balance at end of the year 1,594 2,108
Environmental Contingencies [Member]    
Disclosure of provisions [Line Items]    
Balance at beginning of the year 234  
Changes (additions and deductions) 1,343  
Accretion expense 0  
Disbursements (77)  
Balance at end of the year 1,500 234
Workers' Profit Sharing Payable [Member]    
Disclosure of provisions [Line Items]    
Balance at beginning of the year 1,772  
Changes (additions and deductions) (7)  
Accretion expense 0  
Disbursements (1,696)  
Balance at end of the year 69 1,772
Other Provisions    
Disclosure of provisions [Line Items]    
Balance at beginning of the year 758  
Changes (additions and deductions) 259  
Accretion expense 0  
Disbursements 0  
Balance at end of the year $ 1,017 $ 758