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Provisions and contingent liabilities (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Disclosure of provisions [Line Items]    
Balance at beginning of the year $ 313,327 $ 301,412
Changes (additions and deductions)   22,437
Accretion expense   5,986
Disbursements   (16,508)
Balance at end of the year   313,327
Classification by maturity [Abstract]    
Current portion 81,039 51,816
Non-current portion 232,288 249,596
Closure Of Mining Units Exploration Projects [Member]    
Disclosure of provisions [Line Items]    
Balance at beginning of the year 277,689  
Changes (additions and deductions) 1,779  
Accretion expense 5,623  
Disbursements (13,104) (8,571)
Sale of mining unit   (5,093)
Balance at end of the year 271,987 277,689
Classification by maturity [Abstract]    
Current portion 54,013 32,462
Non-current portion 217,974 245,227
Environmental Liabilities [Member]    
Disclosure of provisions [Line Items]    
Balance at beginning of the year 5,038  
Changes (additions and deductions) 16,557  
Accretion expense 363  
Disbursements (2,002)  
Balance at end of the year 19,956 5,038
Safety Contingencies [Member]    
Disclosure of provisions [Line Items]    
Balance at beginning of the year 4,536  
Changes (additions and deductions) 1,323  
Accretion expense 0  
Disbursements (227)  
Balance at end of the year 5,632 4,536
Labor Contingencies [Member]    
Disclosure of provisions [Line Items]    
Balance at beginning of the year 4,080  
Changes (additions and deductions) 381  
Accretion expense 0  
Disbursements (40)  
Balance at end of the year 4,421 4,080
Obligations With Communities [Member]    
Disclosure of provisions [Line Items]    
Balance at beginning of the year 3,605  
Changes (additions and deductions) (1,010)  
Balance at end of the year 2,595 3,605
Tax contingencies    
Disclosure of provisions [Line Items]    
Balance at beginning of the year 3,110  
Changes (additions and deductions) 299  
Accretion expense 0  
Disbursements 0  
Balance at end of the year 3,409 3,110
Environmental contingencies    
Disclosure of provisions [Line Items]    
Balance at beginning of the year 2,874  
Changes (additions and deductions) 3,425  
Accretion expense 0  
Disbursements (1,135)  
Balance at end of the year $ 5,164 $ 2,874