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Inventory - Summary of Inventory (Detail) - CAD ($)
$ in Thousands
Apr. 30, 2019
Apr. 30, 2018
Inventories [abstract]    
Dore $ 467 $ 955
Goods in transit 0 376
Work-in-process 130 662
Concentrate 0 595
Stockpile 53 118
Supplies 838 793
Inventory $ 1,488 $ 3,499