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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

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