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Provisions, contingent liabilities and other liabilities - Movement of the provision for closure of mining units (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2015
Provisions and contingent liabilities              
Disbursements $ (42,185)            
Closure Of Mining Units And Exploration Projects [Member]              
Provisions and contingent liabilities              
Beginning balance 225,877 $ 200,183          
Changes (additions and deductions) in estimates, Continuing mining units, note 11(a) 26,722 42,874          
Changes (additions and deductions) in estimates, Discontinued mining units, note 1(e) 1,912 6,013          
Changes (additions and deductions) in estimates, Exploration projects, note 26(a) 4,020 (2,433)          
Accretion expense, Continuing mining units, note 27(a) 10,266 4,911          
Accretion expense, Discontinued mining units, note 1(e) 124 71          
Accretion expense, Exploration projects, note 26(a) 266 88          
Disbursements (16,882) (25,830)          
Final balance 252,305 225,877 $ 200,183        
Classification by maturity              
Current portion       $ 35,280 $ 30,524    
Non-current portion       217,025 195,353    
Provision for closure of mining units and exploration projects 252,305 225,877 200,183 252,305 225,877 $ 200,183  
Minera Yanacocha SRL and subsidiary [Member]              
Provisions and contingent liabilities              
Beginning balance 1,294,464 1,234,731          
Additional provisions 301,096 43,560 221,450        
Payments (23,889) (19,842) (21,376)        
Unwinding of discount, note 19 36,709 36,015 21,769        
Final balance 1,608,380 1,294,464 1,234,731        
Classification by maturity              
Current portion       39,156 19,325 19,455  
Non-current portion       1,569,224 1,275,139 1,215,276  
Provision for closure of mining units and exploration projects $ 1,608,380 $ 1,294,464 $ 1,234,731 $ 1,608,380 $ 1,294,464 $ 1,234,731 $ 1,012,888