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STREAM AND ROYALTY INTERESTS, NET - Summary (Details) - USD ($) $ in Thousands |  | 3 Months Ended |  |
--- | --- | --- | --- | ---
May 21, 2025 | Dec. 31, 2025 | Sep. 30, 2025 | Dec. 31, 2024
Oil and Gas, Full Cost Method, Capitalized Cost Excluded from Amortization [Line Items] |  |  |  |
Cost |  |  | $ 6,141,743 | $ 4,985,510
Accumulated Depletion |  |  | (2,039,512) | (1,942,706)
Net |  |  | 4,102,231 | 3,042,804
Warintza Project Stream and Royalty |  |  |  |
Oil and Gas, Full Cost Method, Capitalized Cost Excluded from Amortization [Line Items] |  |  |  |
Conditional funding from acquisition | $ 100,000 |  |  |
Forecast | Warintza Project Stream and Royalty |  |  |  |
Oil and Gas, Full Cost Method, Capitalized Cost Excluded from Amortization [Line Items] |  |  |  |
Asset acquisition, consideration transferred |  | $ 200,000 |  |
Asset acquisition, cash paid for royalty and streaming agreements |  | 100,000 |  |
Forecast | Warintza Project Stream and Royalty | Environmental Impact Milestone |  |  |  |
Oil and Gas, Full Cost Method, Capitalized Cost Excluded from Amortization [Line Items] |  |  |  |
Conditional funding from acquisition |  | 50,000 |  |
Forecast | Warintza Project Stream and Royalty | Security Milestone |  |  |  |
Oil and Gas, Full Cost Method, Capitalized Cost Excluded from Amortization [Line Items] |  |  |  |
Conditional funding from acquisition |  | $ 50,000 |  |
Total production stage stream and royalty interests |  |  |  |
Oil and Gas, Full Cost Method, Capitalized Cost Excluded from Amortization [Line Items] |  |  |  |
Cost |  |  | 4,780,315 | 3,767,113
Accumulated Depletion |  |  | (2,039,512) | (1,942,706)
Net |  |  | 2,740,803 | 1,824,407
Total production stage stream interests |  |  |  |
Oil and Gas, Full Cost Method, Capitalized Cost Excluded from Amortization [Line Items] |  |  |  |
Cost |  |  | 3,473,077 | 2,472,689
Accumulated Depletion |  |  | (1,307,259) | (1,246,349)
Net |  |  | 2,165,818 | 1,226,340
Total production stage stream interests | Kansanshi |  |  |  |
Oil and Gas, Full Cost Method, Capitalized Cost Excluded from Amortization [Line Items] |  |  |  |
Cost |  |  | 1,000,388 |
Accumulated Depletion |  |  | 0 |
Net |  |  | 1,000,388 |
Total production stage stream interests | Mount Milligan |  |  |  |
Oil and Gas, Full Cost Method, Capitalized Cost Excluded from Amortization [Line Items] |  |  |  |
Cost |  |  | 790,635 | 790,635
Accumulated Depletion |  |  | (480,076) | (462,412)
Net |  |  | 310,559 | 328,223
Total production stage stream interests | Pueblo Viejo |  |  |  |
Oil and Gas, Full Cost Method, Capitalized Cost Excluded from Amortization [Line Items] |  |  |  |
Cost |  |  | 610,404 | 610,404
Accumulated Depletion |  |  | (315,400) | (308,283)
Net |  |  | 295,004 | 302,121
Total production stage stream interests | Andacollo |  |  |  |
Oil and Gas, Full Cost Method, Capitalized Cost Excluded from Amortization [Line Items] |  |  |  |
Cost |  |  | 388,182 | 388,182
Accumulated Depletion |  |  | (184,754) | (177,059)
Net |  |  | 203,428 | 211,123
Total production stage stream interests | Khoemacau |  |  |  |
Oil and Gas, Full Cost Method, Capitalized Cost Excluded from Amortization [Line Items] |  |  |  |
Cost |  |  | 265,911 | 265,911
Accumulated Depletion |  |  | (69,350) | (58,043)
Net |  |  | 196,561 | 207,868
Total production stage stream interests | Rainy River |  |  |  |
Oil and Gas, Full Cost Method, Capitalized Cost Excluded from Amortization [Line Items] |  |  |  |
Cost |  |  | 175,727 | 175,727
Accumulated Depletion |  |  | (94,146) | (86,307)
Net |  |  | 81,581 | 89,420
Total production stage stream interests | Other |  |  |  |
Oil and Gas, Full Cost Method, Capitalized Cost Excluded from Amortization [Line Items] |  |  |  |
Cost |  |  | 241,830 | 241,830
Accumulated Depletion |  |  | (163,533) | (154,245)
Net |  |  | 78,297 | 87,585
Total production stage royalty interests |  |  |  |
Oil and Gas, Full Cost Method, Capitalized Cost Excluded from Amortization [Line Items] |  |  |  |
Cost |  |  | 1,307,238 | 1,294,424
Accumulated Depletion |  |  | (732,253) | (696,357)
Net |  |  | 574,985 | 598,067
Total production stage royalty interests | Other |  |  |  |
Oil and Gas, Full Cost Method, Capitalized Cost Excluded from Amortization [Line Items] |  |  |  |
Cost |  |  | 519,720 | 519,491
Accumulated Depletion |  |  | (426,680) | (418,648)
Net |  |  | 93,040 | 100,843
Total production stage royalty interests | Cortez (Legacy Zone and CC Zone) |  |  |  |
Oil and Gas, Full Cost Method, Capitalized Cost Excluded from Amortization [Line Items] |  |  |  |
Cost |  |  | 366,435 | 353,850
Accumulated Depletion |  |  | (96,350) | (81,845)
Net |  |  | 270,085 | 272,005
Total production stage royalty interests | Voisey's Bay |  |  |  |
Oil and Gas, Full Cost Method, Capitalized Cost Excluded from Amortization [Line Items] |  |  |  |
Cost |  |  | 205,724 | 205,724
Accumulated Depletion |  |  | (129,985) | (124,526)
Net |  |  | 75,739 | 81,198
Total production stage royalty interests | Red Chris |  |  |  |
Oil and Gas, Full Cost Method, Capitalized Cost Excluded from Amortization [Line Items] |  |  |  |
Cost |  |  | 116,187 | 116,187
Accumulated Depletion |  |  | (9,033) | (5,966)
Net |  |  | 107,154 | 110,221
Total production stage royalty interests | Peñasquito |  |  |  |
Oil and Gas, Full Cost Method, Capitalized Cost Excluded from Amortization [Line Items] |  |  |  |
Cost |  |  | 99,172 | 99,172
Accumulated Depletion |  |  | (70,205) | (65,372)
Net |  |  | 28,967 | 33,800
Total development stage stream and royalty interests |  |  |  |
Oil and Gas, Full Cost Method, Capitalized Cost Excluded from Amortization [Line Items] |  |  |  |
Cost |  |  | 159,385 | 166,387
Net |  |  | 159,385 | 166,387
Development stage stream interests | Ilovica |  |  |  |
Oil and Gas, Full Cost Method, Capitalized Cost Excluded from Amortization [Line Items] |  |  |  |
Cost |  |  | 12,038 | 12,038
Net |  |  | 12,038 | 12,038
Development stage royalty interests | Other |  |  |  |
Oil and Gas, Full Cost Method, Capitalized Cost Excluded from Amortization [Line Items] |  |  |  |
Cost |  |  | 21,133 | 21,133
Net |  |  | 21,133 | 21,133
Development stage royalty interests | Cactus |  |  |  |
Oil and Gas, Full Cost Method, Capitalized Cost Excluded from Amortization [Line Items] |  |  |  |
Cost |  |  | 48,126 | 55,128
Net |  |  | 48,126 | 55,128
Development stage royalty interests | Back River |  |  |  |
Oil and Gas, Full Cost Method, Capitalized Cost Excluded from Amortization [Line Items] |  |  |  |
Cost |  |  | 42,948 | 42,948
Net |  |  | 42,948 | 42,948
Development stage royalty interests | La Fortuna |  |  |  |
Oil and Gas, Full Cost Method, Capitalized Cost Excluded from Amortization [Line Items] |  |  |  |
Cost |  |  | 35,140 | 35,140
Net |  |  | 35,140 | 35,140
Total exploration stage stream and royalty interests |  |  |  |
Oil and Gas, Full Cost Method, Capitalized Cost Excluded from Amortization [Line Items] |  |  |  |
Cost |  |  | 1,202,043 | 1,052,010
Net |  |  | 1,202,043 | 1,052,010
Exploration stage stream interests | Warintza |  |  |  |
Oil and Gas, Full Cost Method, Capitalized Cost Excluded from Amortization [Line Items] |  |  |  |
Cost |  |  | 95,252 |
Net |  |  | 95,252 |
Exploration stage stream interests | Xavantina |  |  |  |
Oil and Gas, Full Cost Method, Capitalized Cost Excluded from Amortization [Line Items] |  |  |  |
Cost |  |  | 64,834 | 14,792
Net |  |  | 64,834 | 14,792
Exploration stage royalty interests | Other |  |  |  |
Oil and Gas, Full Cost Method, Capitalized Cost Excluded from Amortization [Line Items] |  |  |  |
Cost |  |  | 132,762 | 115,438
Net |  |  | 132,762 | 115,438
Exploration stage royalty interests | Cortez (Legacy Zone and CC Zone) |  |  |  |
Oil and Gas, Full Cost Method, Capitalized Cost Excluded from Amortization [Line Items] |  |  |  |
Cost |  |  | 443,894 | 456,479
Net |  |  | 443,894 | 456,479
Exploration stage royalty interests | Red Chris |  |  |  |
Oil and Gas, Full Cost Method, Capitalized Cost Excluded from Amortization [Line Items] |  |  |  |
Cost |  |  | 48,895 | 48,895
Net |  |  | 48,895 | 48,895
Exploration stage royalty interests | Great Bear |  |  |  |
Oil and Gas, Full Cost Method, Capitalized Cost Excluded from Amortization [Line Items] |  |  |  |
Cost |  |  | 209,106 | 209,106
Net |  |  | 209,106 | 209,106
Exploration stage royalty interests | Pascua-Lama |  |  |  |
Oil and Gas, Full Cost Method, Capitalized Cost Excluded from Amortization [Line Items] |  |  |  |
Cost |  |  | 177,690 | 177,690
Net |  |  | 177,690 | 177,690
Exploration stage royalty interests | Côté |  |  |  |
Oil and Gas, Full Cost Method, Capitalized Cost Excluded from Amortization [Line Items] |  |  |  |
Cost |  |  | 29,610 | 29,610
Net |  |  | $ 29,610 | $ 29,610

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