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Other accounts payable (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Current    
Mining royalties, interests and penalties 2006-2008 [1] $ 36,113 $ 0
Other 4,069 3,619
Total current $ 39,261 $ 55,305
[1] Represents the current portion of payments under the installment program approved by SUNAT related to disputed mining royalties of US$14.9 million and interest and penalties of US$21.2 million (see Note 14(d)).