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Inventories
 12 Months Ended
Dec. 31, 2021
Classes of current inventories [abstract]  
Inventories
10. Inventories
December 31, 2021December 31, 2020
Ore stockpiles$10,097 $6,327 
In-process inventory and finished goods63,513 68,984 
Materials and supplies104,553 88,824 
$178,163 $164,135 

In 2021, inventories of $386,900 (2020 – $367,310) were recognized as an expense during the year and included in cost of sales.
During the year ended December 31, 2021, charges of nil were recognized in production costs to reduce the cost of lead and zinc concentrate inventory to net realizable value. During the year ended December 31, 2020, charges of $2,122 and $206 were recognized in production costs and depreciation, respectively, to reduce the cost of lead and zinc concentrate inventory at Stratoni to net realizable value.