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Inventories | 12 Months Ended
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Dec. 31, 2021
Classes of current inventories [abstract] |
Inventories | 10. Inventories
| December 31, 2021 |  | December 31, 2020
Ore stockpiles | $ | 10,097 |  |  | $ | 6,327 |
In-process inventory and finished goods | 63,513 |  |  | 68,984 |
Materials and supplies | 104,553 |  |  | 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.

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