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Trade and other receivables, net - Forced payments of tax debts that are in litigation (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Disclosure of Trade and other receivables, net [Line Items]    
Other receivables $ 173,337 $ 172,131
Buenaventura    
Disclosure of Trade and other receivables, net [Line Items]    
Other receivables 56,370 37,733
Buenaventura | SUNAT seizure    
Disclosure of Trade and other receivables, net [Line Items]    
Other receivables 33,240 36,321
Buenaventura | Forced payment of part of the tax liability debt    
Disclosure of Trade and other receivables, net [Line Items]    
Other receivables 19,918  
Buenaventura | Inminsur's tax liability debt    
Disclosure of Trade and other receivables, net [Line Items]    
Other receivables 1,403 1,412
Buenaventura | Payment of the tax liability debt imputed by SUNAT in the IGV inspection process    
Disclosure of Trade and other receivables, net [Line Items]    
Other receivables 1,311  
Buenaventura | Forced payment of part of the tax debt    
Disclosure of Trade and other receivables, net [Line Items]    
Other receivables 498  
Rio Seco | Forced payment of part of the VAT tax liability    
Disclosure of Trade and other receivables, net [Line Items]    
Other receivables 3,279 3,398
El Brocal    
Disclosure of Trade and other receivables, net [Line Items]    
Other receivables 2,724 2,618
El Brocal | Payment under protest of the tax liability    
Disclosure of Trade and other receivables, net [Line Items]    
Other receivables 2,303 2,517
El Brocal | Payment of the fine for the benefit of reducing the fine    
Disclosure of Trade and other receivables, net [Line Items]    
Other receivables 402  
El Brocal | Other minor    
Disclosure of Trade and other receivables, net [Line Items]    
Other receivables 19 101
Consorcio Energtico de Huancavelica S.A.    
Disclosure of Trade and other receivables, net [Line Items]    
Other receivables $ 62,373 44,014
Consorcio Energtico de Huancavelica S.A. | Payment of the fine for the benefit of reducing the fine    
Disclosure of Trade and other receivables, net [Line Items]    
Other receivables   $ 265