XML 173 R159.htm IDEA: XBRL DOCUMENT v3.19.1
Provisions and contingent liabilities (Details 1) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of provisions [Line Items]            
Beginning balance $ 200,183 $ 206,462        
Reversal of impairment loss 0 (11,770) $ 0      
Changes and additions in estimates (discontinued operations), note 1(e) 6,013 12,701        
Changes and additions in estimates (continued operations), note 12(a) 42,874 10,594        
Provision for exploration projects (2,433) 891        
Accretion expense (continued operations), note 27 4,911 4,360        
Accretion expense (exploration projects) 71 22        
Accretion expense (discontinued operations), note 1(e) 54 215        
Disbursements (25,796) (23,292)        
Final balance 225,877 200,183 206,462      
Classification by maturity            
Current portion       $ 30,524 $ 39,826  
Non-current portion       195,353 160,357  
Provision for closure of mining units and exploration projects 200,183 200,183 206,462 225,877 200,183 $ 206,462
Minera Yanacocha SRL and subsidiary [Member]            
Disclosure of provisions [Line Items]            
Beginning balance 1,234,731 1,012,888 578,959      
Additional provisions 43,560 221,450 430,292      
Payments (19,842) (21,376) (10,467)      
Unwinding of discount, note 19 36,015 21,769 14,104      
Final balance 1,294,464 1,234,731 1,012,888      
Classification by maturity            
Current portion       19,325 19,455 15,636
Non-current portion       1,275,139 1,215,276 997,252
Provision for closure of mining units and exploration projects $ 1,294,464 $ 1,234,731 $ 1,012,888 $ 1,294,464 $ 1,234,731 $ 1,012,888