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INVENTORIES (Details) - CAD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Disclosure Of Inventories Explanatory [Abstract]    
Ore stockpile $ 17,714 $ 19,972
Rough diamonds 56,300 45,999
Supplies inventory 28,247 16,202
Total $ 102,261 $ 82,173