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Inventory, net (Details 2) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of Inventory, net [Abstract]      
Beginning Balance $ 11,603 $ 8,386 $ 20,472
Provision for impairment of finished and in progress goods, note 21(a) 7,715 6,151 0
Reversal for impairment of finished and in progress goods (continuing operations), note 21(a) (119) 0 (7,581)
Provision for impairment of spare parts and supplies, note 26 7,039 2,444 0
Reversal for impairment of spare parts and supplies (discontinued operations), note 1(e) 0 (1,345) (706)
Transfer from mining units held for sale 0 0 1,448
Reversal in provision for impairment of inventories 0 0 (5,137)
Reversal for impairment of spare parts and supplies, note 26 0 0 (110)
Final balance $ 23,163 $ 11,603 $ 8,386