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Inventories (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Disclosure of inventories [Line Items] |  |
Inventories | $ 218,715 | $ 237,329
Production costs | 648,068 | 575,896
NRV adjustments to inventory | 12,300 | (42,800)
Inventories, at net realisable value | 125,500 | 48,200
Concentrate [member] |  |
Disclosure of inventories [Line Items] |  |
Inventories | 11,582 | 12,891
Stockpile ore [member] |  |
Disclosure of inventories [Line Items] |  |
Inventories | 16,209 | 31,964
Non-current inventories | 9,500 | 18,400
Stockpile ore [member] | Manantial Espejo mine [member] |  |
Disclosure of inventories [Line Items] |  |
Impairment charge | 10,000 |
Stockpile ore [member] | Manantial Espejo and Dolores mines [member] |  |
Disclosure of inventories [Line Items] |  |
Impairment charge |  | 6,000
Heap leach and in process [member] |  |
Disclosure of inventories [Line Items] |  |
Inventories | 108,509 | 109,705
Non-current inventories | 74,300 | 65,200
Heap leach and in process [member] | Manantial Espejo mine [member] |  |
Disclosure of inventories [Line Items] |  |
Impairment charge |  | 1,500
Heap leach and in process [member] | Manantial Espejo and Dolores mines [member] |  |
Disclosure of inventories [Line Items] |  |
Impairment charge | 10,300 |
Dore and finished [member] |  |
Disclosure of inventories [Line Items] |  |
Inventories | 35,054 | 36,864
Dore and finished [member] | Manantial Espejo mine [member] |  |
Disclosure of inventories [Line Items] |  |
Impairment charge | 2,900 |
Dore and finished [member] | Manantial Espejo and Alamo Dorado mines [member] |  |
Disclosure of inventories [Line Items] |  |
Impairment charge |  | 3,400
Materials and supplies [member] |  |
Disclosure of inventories [Line Items] |  |
Inventories | $ 47,361 | $ 45,905

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