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Additional information on the consolidated statements of loss - Disclosure of expenses by nature (Details) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Additional Information On Consolidated Statements Of Loss Abstract    
Impairment of assets $ 243,576 $ 166,316
Depletion and depreciation 48,270 52,786
Employee benefit expenses (see next page) 20,701 14,015
Professional fees 3,453 3,827
Travel expenses 1,108 1,363
Communication and promotional expenses 1,006 1,166
Rent and office expenses 828 1,704
Public company expenses 822 639
Gain on disposal of stream and offtake interests (7,636) (9,094)
Cost recoveries from associates (595) (677)
Other expenses 1,411 653
Expenses, by nature $ 312,944 $ 232,698