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Basis for preparation, consolidation and accounting policies (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Loans and receivables -        
Trade receivables (without provisional prices) $ 61,188      
Trade receivables (with provisional prices) 144,844 $ 61,188    
Other accounts receivables 105,607 145,043    
Financial assets at fair value through profit and loss -        
Embedded derivatives 7,424      
Trade receivables 146,701 213,456    
Other Receivables 105,607 145,043    
Loans and borrowings -        
Bank loans 95,000 96,215 $ 55,000 $ 285,302
Financial obligations 46,166 83,991    
Trade and other payables 220,042 100,860    
Financial liability at fair value through profit and loss -        
Contingent consideration liability 15,755 17,570 $ 19,343 $ 16,994
Fair value with changes in profit (loss) -        
Hedge derivative financial instruments 2,759 28,705    
Minera Yanacocha SRL and subsidiary [Member]        
Loans and receivables -        
Financial assets, at fair value 23,000 16,454    
Financial assets at fair value through profit and loss -        
Embedded derivatives 15 346    
Trade receivables 1,032 9,965    
Other Receivables 25,557 24,055    
Loans and borrowings -        
Financial obligations 82,600 80,489    
Trade and other payables 81,215 63,300    
Financial assets at fair value through profit or loss, category [member]        
Loans and receivables -        
Trade receivables (without provisional prices) 0      
Trade receivables (with provisional prices) 152,268      
Other accounts receivables 0      
Financial assets at fair value through profit and loss -        
Embedded derivatives 0      
Loans and borrowings -        
Bank loans 0      
Financial obligations 0      
Trade and other payables 0      
Financial liability at fair value through profit and loss -        
Contingent consideration liability 17,570      
Fair value with changes in profit (loss) -        
Hedge derivative financial instruments 0      
Financial assets at fair value through profit or loss, category [member] | Minera Yanacocha SRL and subsidiary [Member]        
Loans and receivables -        
Financial assets, at fair value 23,000 16,454    
Financial assets at fair value through profit and loss -        
Embedded derivatives 15 346    
Trade receivables 0 0    
Other Receivables 0 0    
Loans and borrowings -        
Trade and other payables 0 0    
Financial assets at amortised cost, category [member]        
Loans and receivables -        
Trade receivables (without provisional prices) 61,188      
Trade receivables (with provisional prices) 0      
Other accounts receivables 51,808      
Financial assets at fair value through profit and loss -        
Embedded derivatives 0      
Loans and borrowings -        
Bank loans 96,215      
Financial obligations 633,083      
Trade and other payables 220,042      
Financial liability at fair value through profit and loss -        
Contingent consideration liability 0      
Fair value with changes in profit (loss) -        
Hedge derivative financial instruments 0      
Financial assets at amortised cost, category [member] | Minera Yanacocha SRL and subsidiary [Member]        
Loans and receivables -        
Financial assets, at fair value 0 0    
Financial assets at fair value through profit and loss -        
Embedded derivatives 0 0    
Trade receivables 1,032 9,965    
Other Receivables 25,557 24,055    
Loans and borrowings -        
Trade and other payables 81,215 $ 63,300    
Fair value through other profit or loss [Member]        
Loans and receivables -        
Trade receivables (without provisional prices) 0      
Trade receivables (with provisional prices) 0      
Other accounts receivables 0      
Financial assets at fair value through profit and loss -        
Embedded derivatives 0      
Loans and borrowings -        
Bank loans 0      
Financial obligations 0      
Trade and other payables 0      
Financial liability at fair value through profit and loss -        
Contingent consideration liability 0      
Fair value with changes in profit (loss) -        
Hedge derivative financial instruments $ 28,705