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Other operating expenses (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of other operating expenses [Abstract]      
Royalties, net of asset tax (ITAN) and penalties (a) [1] $ 55,088 $ 243,798 $ 0
Other expenses 13,595 15,028 24,107,000
Miscellaneous other operating expense $ 68,683 $ 258,826 $ 24,107,000
[1] For the year ended December 31, 2018, mainly represents penalties for income tax related to disputed mining royalties for the year 2006 through the year 2011 of US$33.8 million, penalties on disputed mining royalties for the period January 2009 through December 2013 of US$17.7 million and profit sharing adjustments related to GEM refund of US$3.6 million.