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Segment disclosure - Disclosure of revenues, expenses and cash flows per operating segment (Detail) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Disclosure of operating segments [line items]    
Revenues $ 224,877 $ 213,630
Gross profit 138,870 104,325
Operating expenses (G&A, bus. dev and exploration) (46,630) (36,322)
Mining operating expenses (12,919) 0
Impairments (126,650) (36,298)
Net earnings (loss) (56,675) 16,229
Cash flows from operating activities    
Before working capital items 131,094 106,244
Working capital items (24,999) 1,734
After working capital items 106,095 107,978
Cash flows from investing activities (272,038) (223,099)
Cash flows from financing activities (19,601) 316,861
Royalties, streams and similar interests [Member]    
Disclosure of operating segments [line items]    
Revenues 224,877 213,630
Gross profit 138,870 104,325
Operating expenses (G&A, bus. dev and exploration) (23,778) (28,021)
Mining operating expenses 0  
Impairments (4,400) (36,298)
Net earnings (loss) 77,277 23,501
Cash flows from operating activities    
Before working capital items 158,632 116,631
Working capital items (5,413) (2,669)
After working capital items 153,219 113,962
Cash flows from investing activities (120,766) (161,131)
Cash flows from financing activities (54,339) 109,444
Mining exploration, evaluation and development [Member]    
Disclosure of operating segments [line items]    
Revenues 7,275 0
Gross profit 0 0
Operating expenses (G&A, bus. dev and exploration) (22,852) (8,301)
Mining operating expenses (12,919)  
Impairments (122,250) 0
Net earnings (loss) (133,952) (7,272)
Cash flows from operating activities    
Before working capital items (21,828) (10,387)
Working capital items (19,586) 4,403
After working capital items (41,414) (5,984)
Cash flows from investing activities (156,982) (61,968)
Cash flows from financing activities 34,738 207,417
Intersegment transactions (Member)    
Disclosure of operating segments [line items]    
Revenues (7,275) 0
Gross profit 0 0
Operating expenses (G&A, bus. dev and exploration) 0 0
Mining operating expenses 0  
Impairments 0 0
Net earnings (loss) 0 0
Cash flows from operating activities    
Before working capital items (5,710) 0
Working capital items 0 0
After working capital items (5,710) 0
Cash flows from investing activities 5,710 0
Cash flows from financing activities $ 0 $ 0