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Inventories (Tables)
 12 Months Ended
Dec. 31, 2019
Subclassifications of assets, liabilities and equities [abstract]  
Schedule of inventories
Inventories consist of: 
 
 
December 31,
2019

 
December 31,
2018

Concentrate inventory
 
$
17,433

 
$
19,286

Stockpile ore (1)
 
27,708

 
3,945

Heap leach inventory and in process (2)
 
169,751

 
113,199

Doré and finished inventory (3)
 
67,820

 
30,736

Materials and supplies
 
88,004

 
47,299

Total inventories
 
$
370,716

 
$
214,465

Less: current portion of inventories
 
$
(346,507
)
 
$
(214,465
)
Non-current portion of inventories (4)
 
$
24,209

 
$
—

(1)
Includes an impairment charge of $5.0 million to reduce the cost basis of inventory to NRV at Manantial Espejo and Dolores mines (2018 – $11.2 million at Manantial Espejo mine).
(2)
Includes an impairment charge of $39.3 million to reduce the cost basis of inventory to NRV at Manantial Espejo and Dolores mines (2018 - $28.9 million at Manantial Espejo and Dolores mines).
(3)
Includes an impairment charge of $2.9 million to reduce the cost basis of inventory to NRV at Manantial Espejo and Dolores mines at December 31, 2019. (2018 - $7.5 million at Manantial Espejo mine).