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Inventories
 12 Months Ended
Dec. 31, 2020
Classes of current inventories [abstract]  
Inventories
8. Inventories
December 31, 2020December 31, 2019
Ore stockpiles$6,327 $3,859 
In-process inventory and finished goods81,120 81,282 
Materials and supplies88,824 78,093 
$176,271 $163,234 

In 2020, inventories of $367,310 (2019 – $296,218) were recognized as an expense during the year and included in cost of sales.
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. During the year ended December 31, 2019, charges of $632 and $1,894 were recognized in production costs and depreciation, respectively, to reduce the cost of lead, zinc and gold concentrate inventory at Olympias and Stratoni to net realizable value.