v3.26.1
Mineral Royalty Interests - Summary of Mineral Royalty Interest (Parenthetical) (Detail)
$ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2026
USD ($)
oz
Dec. 31, 2025
USD ($)
oz
Bottom of range [member]    
Disclosure Of Detailed Information About Mineral Royalty Interest [Line Items]    
Net smelter return royalty percentage 0.15% 0.15%
Top of range [member]    
Disclosure Of Detailed Information About Mineral Royalty Interest [Line Items]    
Net smelter return royalty percentage 2.70% 2.70%
Brewery Creek Royalty [Member]    
Disclosure Of Detailed Information About Mineral Royalty Interest [Line Items]    
Upfront cash payment for Royalty interest $ 3 $ 3
Net smelter return royalty percentage 2.00% 2.00%
Ounces of gold mined from ore extracted from the property before step up in royalty percentage | oz 600,000 600,000
Net smelter return royalty percentage after step up 2.75% 2.75%
Total consideration owed by Mine Operator upon election of reacquisition of royalty interest $ 2 $ 2
Net​ smelter​ return​ royalty​ percentage after potential buy back 2.125% 2.125%
Black Pine [Member]    
Disclosure Of Detailed Information About Mineral Royalty Interest [Line Items]    
Net smelter return royalty percentage [1],[2] 0.50% 0.50%
Percentage of repurchase of net smelter return of royalty 50.00% 50.00%
Repurchase Amount Of Net Smelter Return Of Royalty $ 4 $ 4
Mt Todd [Member]    
Disclosure Of Detailed Information About Mineral Royalty Interest [Line Items]    
Percentage of gross revenue from royalty 1.00% 1.00%
Mt Todd [Member] | Top of range [member]    
Disclosure Of Detailed Information About Mineral Royalty Interest [Line Items]    
Maximum percentage in royalty rate 2.00% 2.00%
[1] Abbreviation as follows: NSR = Net Smelter Return Royalty; and GR = Gross Royalty.
[2] Liberty Gold has been granted an option to repurchase 50% of the NSR for $4 million at any point in time up to the earlier of commercial production at Black Pine or January 1, 2030.