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Prepaid expenses (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Disclosure of Prepaid expenses [Abstract]    
Prepaid rentals [1] $ 28,349 $ 29,235
Prepaid insurances 12,401 6,055
Deferred costs of works for taxes 2,013 1,801
Deferred royalties and rentals of mining concessions 387 2,377
Other prepaid expenses 1,956 2,355
Prepayments 45,106 41,823
Classification by maturity:    
Current portion 17,551 11,392
Non-current portion 27,555 30,431
Prepayments $ 45,106 $ 41,823
[1] This item corresponds to the balance of an original prepayment of US$31 million for the lease of hydraulic installations by the subsidiary Empresa de Generacion Huanza S.A. This prepayment is being charged to results during the life of the underlying assets (35 years) since January 2015.