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Financial expenses (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Finance Expense [Line Items]      
Financial expenses $ 37,822 $ 42,173 $ 38,422
Sociedad Minera Cerro Verde S.A.A. [Member]      
Finance Expense [Line Items]      
Interest on disputed mining royalties (a) 43,838 68,107 370,159
Tax contingencies (b) 54,098 2,488 4,273
Interest on senior unsecured credit facility (see Note 10(b)) 22,351 39,083 49,551
Excess of salaries limit in workers profit sharing 16,591 0  
Interest for leases (see Note 10(a)) 4,875 5,242  
Amortization debt issuance cost (See Note 10(b)) 1,673 1,768 2,419
Extinguishment of debt - debt issuance cost (see Note 10(b)) 902 1,298 1,902
Capitalized Interest associated to capital projects (see Note 7(a)) (2,544) (4,504) (3,790)
Other financial expenses 891 2,395 2,219
Financial expenses $ 142,675 $ 115,877 $ 426,733