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Inventories (Tables)
 12 Months Ended
Dec. 31, 2020
Subclassifications of assets, liabilities and equities [abstract]  
Schedule of inventories
Inventories consist of: 
 December 31,
2020		December 31,
2019
Concentrate inventory$19,104 $17,433 
Stockpile ore (1)
30,063 27,708 
Heap leach inventory and in process (2)
219,334 169,751 
Doré and finished inventory (3)
77,489 67,820 
Materials and supplies84,556 88,004 
Total inventories$430,546 $370,716 
Less: current portion of inventories$(406,191)$(346,507)
Non-current portion of inventories (4)
$24,355 $24,209 
(1)Includes an impairment charge of $2.0 million to reduce the cost basis of inventory to NRV at Manantial Espejo mine (2019 – $5.0 million at Manantial Espejo and Dolores mines).
(2)Includes an impairment charge of $26.2 million to reduce the cost basis of inventory to NRV at Manantial Espejo and Dolores mines (2019 - $39.3 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 Dolores mine at December 31, 2020. (2019 - $2.9 million at Manantial Espejo and Dolores mines).
(4)Inventories at Escobal mine, which include $17.1 million (2019 - $16.9 million) in supplies with the remainder attributable to metals, have been classified as non-current pending the restart of operations.