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Inventories (Tables)
 12 Months Ended
Dec. 31, 2018
Subclassifications of assets, liabilities and equities [abstract]  
Schedule of 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).