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Financial expenses (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Finance Expense [Line Items]      
Interest on mining royalties (a)     $ 144,815
Interest on senior unsecured credit facility (see Note 10(b))     44,678
Interest for leases (see Note 10(a)) $ 5,242   0
Amortisation of debt issuance costs     4,479
Extinguishment debt - debt issuance cost     6,266
Interest on shareholder loans (Note 11(b))     7,992
Capitalized Interest     (2,252)
Other financial expenses (b)     10,934
Finance costs 42,173 $ 38,422 34,551
Sociedad Minera Cerro Verde S.A.A. [Member]      
Finance Expense [Line Items]      
Interest on mining royalties (a) 68,107 370,159  
Interest on senior unsecured credit facility (see Note 10(b)) 39,083 49,551  
Interest for leases (see Note 10(a)) 5,242 0  
Amortisation of debt issuance costs 1,768 2,419  
Extinguishment debt - debt issuance cost 1,299 1,902  
Interest on shareholder loans (Note 11(b)) 0 0  
Capitalized Interest (4,504) (3,790)  
Other financial expenses (b) 4,882 6,492  
Finance costs $ 115,877 $ 426,733 $ 216,912