v3.25.2

Cash (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2025
Cash [Abstract] |
Disclosure of cash position [Table Text Block] |
|  | December 31, |  |  | December 31, |
|  | 2025 |  |  | 2024 |
|  | $ |  |  | $ |
Cash held in U.S. dollars |  | 130,509 |  |  | 48,223 |
Cash held in Canadian dollars (i) |  | 11,622 |  |  | 10,873 |
Total cash |  | 142,131 |  |  | 59,096 |

X
- References No definition available. + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Entire disclosure related to cash position. + References No definition available. + Details
Name: | or_DisclosureOfCashPositionExplanatory
Namespace Prefix: | or_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration