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Provisions and contingent liabilities (Details Textual) - USD ($)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2013
Jun. 27, 2016
Dec. 31, 2015
Disclosure of provisions [Line Items]            
Provision for closure of mining units and exploration projects at future value $ 280,300,000          
Provision for closure of mining units and exploration projects 225,877,000 $ 200,183,000 $ 206,462,000      
Letter of credit $ 119,700,000 109,600,000        
Employee's profit share on annual taxable income 8.00%          
Other provisions $ 758,000 1,364,000        
Notional amount $ 275,000,000 275,000,000     $ 275,000,000  
Future value of non current provisions   $ 374,400,000 $ 368,800,000      
Annual risk free rate 2.99% 2.73% 2.97%      
Increase (decrease) through transfers and other changes, other provisions $ 32,000,000          
Disputed mining royalties, noncurrent 113,800,000     $ 70,000,000    
Net asset tax included in provisions 19,600,000 $ 9,800,000        
Income and non-income tax contingencies included in other long-term liabilities 6,200,000 11,400,000        
Special Mining Tax       $ 50,800,000    
Ministry of Energy and Mines [Member]            
Disclosure of provisions [Line Items]            
Notional amount 42,700,000          
Provision for remediation and mine closure [Member]            
Disclosure of provisions [Line Items]            
Non-current provisions 131,900,000 156,900,000 $ 153,300,000      
Future value of non current provisions 374,400,000          
Increase (decrease) through transfers and other changes, other provisions (32,017,000) (3,710,000) (16,091,000)      
La Joya [Member] | Irrigation Project [Member] | Provision for social commitments [Member]            
Disclosure of provisions [Line Items]            
Other provisions 4,500,000          
Alata-Congata Road [Member] | Repaving Project [Member] | Provision for social commitments [Member]            
Disclosure of provisions [Line Items]            
Other provisions $ 5,400,000          
Number of days of work [Member]            
Disclosure of provisions [Line Items]            
Percentage of distribution 50.00%          
Annual salary levels [Member]            
Disclosure of provisions [Line Items]            
Percentage of distribution 50.00%          
Minera Yanacocha SRL and subsidiary [Member]            
Disclosure of provisions [Line Items]            
Provision for closure of mining units and exploration projects $ 1,294,464,000 1,234,731,000 1,012,888,000     $ 578,959,000
Reclamation Expense 16,284,000 124,124,000 $ 78,494,000      
Other provisions 2,785,000 1,403,000        
Minera Yanacocha SRL and subsidiary [Member] | Asset retirement and mine closure cost asset [member]            
Disclosure of provisions [Line Items]            
Additions other than through business combinations, property, plant and equipment $ 27,200,000 $ 97,000,000        
Bottom of range [member]            
Disclosure of provisions [Line Items]            
Actuarial assumption of discount rates 0.30% 0.30%        
Top of range [member]            
Disclosure of provisions [Line Items]            
Discount rate used to reflect time value of money for provisions 4.74%          
Actuarial assumption of discount rates 2.90% 2.90%