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INVENTORIES - Disclosure of Inventories (Details) - CAD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Classes of current inventories [abstract] |  |
Ore stockpiles | $ 21,946 | $ 6,657
Copper contained in concentrate | 7,948 | 9,055
Molybdenum concentrate | 398 | 230
Materials and supplies | 28,549 | 27,678
Inventories | $ 58,841 | $ 43,620

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