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Inventories | 12 Months Ended
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Dec. 31, 2018
Subclassifications of assets, liabilities and equities [abstract] |
Inventories |
10. INVENTORIES |  |
Inventories consist of:
|  | December 31, 2018 |  |  | December 31, 2017 |
Concentrate inventory |  | $ | 19,286 |  |  | $ | 11,582 |
Stockpile ore (1) |  | 3,945 |  |  | 16,209 |
Heap leach inventory and in process (2) |  | 113,199 |  |  | 108,509 |
Doré and finished inventory (3) |  | 30,736 |  |  | 35,054 |
Materials and supplies |  | 47,299 |  |  | 47,361 |
|  | $ | 214,465 |  |  | $ | 218,715 |
(1) | Includes an impairment charge of $11.2 million to reduce the cost basis of inventory to NRV at Manantial Espejo and Dolores mines (December 31, 2017 – $10.0 million at Manantial Espejo mine).
(2) | Includes an impairment charge of $28.9 million to reduce the cost basis of inventory to NRV at Manantial Espejo and Dolores mines (December 31, 2017 - $10.3 million at Manantial Espejo and Dolores mines).
(3) | Includes an impairment charge of $7.5 million to reduce the cost basis of inventory to NRV at Manantial Espejo and Dolores mines at December 31, 2018. (December 31, 2017 - $2.9 million at Manantial Espejo mine).
The costs of inventories recognized as expense for the year ended December 31, 2018 amounted to $683.6 million (2017 – $648.1 million), of which $515.6 million (2017 – $500.7 million) and $147.3 million (2017 – $122.9 million) was included in production costs and depreciation and depletion in the Consolidated Income Statements, respectively. During the year ended December 31, 2018 a $24.3 million (2017 - $12.3 million NRV loss) NRV loss was recognized, primarily driven by decreased metal prices, and included in production costs (Note 21). Inventories held at NRV amounted to $143.6 million (2017 - $125.5 million). A portion of the Stockpile ore amounting to $2.5 million (2017 - $9.5 million) and a portion of the heap leach inventory amounting to $75.3 million (2017 - $74.3 million) are expected to be recovered or settled after more than twelve months.

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