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Acquisitions and Other Transactions - Acquisition of Additional Royalty and Private Placement (Details)
$ / shares in Units, $ in Millions, $ in Millions
 12 Months Ended
Jul. 26, 2023
USD ($)
shares
Jul. 26, 2023
CAD ($)
$ / shares
shares
Jun. 08, 2023
USD ($)
May 07, 2023
USD ($)
shares
May 07, 2023
CAD ($)
$ / shares
shares
Apr. 14, 2023
USD ($)
Feb. 22, 2023
Jun. 08, 2019
Feb. 19, 2019
USD ($)
Dec. 31, 2023
Feb. 19, 2019
CAD ($)
Acquisitions                      
Percentage of NSR             1.50%   2.00%    
Buy back percentage of net smelter return               0.50%      
Marathon Gold Corporation, Valentine Gold Project Acquisition                      
Acquisitions                      
Additional NSR acquired     1.50%                
Purchase price     $ 45.0           $ 13.7   $ 18.0
Percentage of NSR             2.00%     3.00%  
Number of shares acquired | shares       6,578,947 6,578,947            
Price per share | $ / shares         $ 0.76            
Total cost of shares acquired       $ 3.8 $ 5.0            
Royalty on Kerr-Addison Property and Share Subscription with Gold Candle Ltd. - Ontario, Canada                      
Acquisitions                      
Purchase price | $           $ 10.0          
Percentage of NSR           1.00%          
Number of shares acquired | shares 5,454,546 5,454,546                  
Price per share | $ / shares   $ 1.1                  
Total cost of shares acquired $ 4.6 $ 6.0