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Inventories | 12 Months Ended
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Dec. 31, 2019
Classes of current inventories [abstract] |
Inventories | 9. Inventories
| December 31, 2019 |  |  | December 31, 2018 |
Ore stockpiles | $ | 3,859 |  |  | $ | 1,620 |
In-process inventory and finished goods | 81,282 |  |  | 59,974 |
Materials and supplies | 78,093 |  |  | 76,291 |
| $ | 163,234 |  |  | $ | 137,885 |
The cost of materials and supplies consumed during the year and included in production costs amounted to $321,138 (2018 – $259,813). Charges of $632 and $1,894 were recognized in production costs and depreciation, respectively, during the year ended December 31, 2019 to reduce the cost of gold, lead and zinc concentrate inventory at Olympias and Stratoni to net realizable value (December 31, 2018 - $1,465 recognized in production costs).

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