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Selling Expenses (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of Selling Expenses [Line Items]      
Total $ 18,533 $ 24,313 $ 26,948
Minera Yanacocha SRL and subsidiary [Member]      
Disclosure of Selling Expenses [Line Items]      
Selling Expense 1,412 1,719 1,551
Other 510 3 1,076
Total 1,922 1,722 2,627
Sociedad Minera Cerro Verde S.A.A. [Member]      
Disclosure of Selling Expenses [Line Items]      
Copper concentrate freight 89,241 98,933 126,670
Commissions 4,935 5,588 6,048
Cathode freight 2,019 1,890 1,831
Other 1,485 3,072 2,459
Total $ 97,680 $ 109,483 $ 137,008