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Provisions (Details 1) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 07, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of provisions [Line Items]              
Beginning balance   $ 206,462 $ 166,403        
Transfer of units held for sale   0 15,851        
Reversal of impairment loss   (11,770) 0 $ 0      
Changes and additions in estimates (discontinued operations), note 1(e)   12,701 3,365        
Accretion expense (discontinued operations), note 1(e)   215 970        
Changes and additions in estimates (continued operations), note 12(a)   10,594 34,532        
Accretion expense (continued operations), note 27   4,382 4,116        
Provision for exploration projects   891 0        
Disbursements   (23,292) (18,775)        
Final balance   200,183 206,462 166,403      
Classification by maturity              
Current portion         $ 39,826 $ 37,405  
Non-current portion         160,357 169,057  
Provision for closure of mining units and exploration projects   200,183 206,462 166,403 200,183 206,462 $ 166,403
Increase (decrease) through transfers and other changes, other provisions   3,700          
Provision for remediation and mine closure [Member]              
Classification by maturity              
Beginning balance   153,313 161,270        
Increase through adjustments arising from passage of time, other provisions   4,595 4,391        
Increase (decrease) through transfers and other changes, other provisions   (3,710) (16,091)        
Additional provisions, other provisions   2,661 3,743        
Final balance   156,859 153,313 161,270      
Minera Yanacocha SRL and subsidiary [Member]              
Disclosure of provisions [Line Items]              
Beginning balance   1,012,888 [1] 578,959 557,457      
Additional provisions $ 430,000 221,450 430,292 10,434      
Payments   (21,376) (10,467) (11,007)      
Unwinding of discount, note 19   21,769 14,104 22,075      
Final balance   1,234,731 [1] 1,012,888 [1] 578,959      
Classification by maturity              
Current portion         19,455 15,636 6,698
Non-current portion         1,215,276 997,252 572,261
Provision for closure of mining units and exploration projects   $ 1,234,731 [1] $ 1,012,888 [1] $ 578,959 $ 1,234,731 [1] $ 1,012,888 [1] $ 578,959
[1] Provision for closure of mining units and explorations projects - The Company's mining and exploration activities are subject to various laws and regulations governing the protection of the environment. These laws and regulations are continually changing and are generally becoming more restrictive. The Company conducts its operations so as to protect the public health and environment and believes its operations are in compliance with all applicable laws and regulations in all material respects. The Company has made, and expects to make in the future, expenditures to comply with such laws and regulations, but cannot predict the amount of such future expenditures. Estimated future reclamation costs are based principally on legal and regulatory requirements.