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Exploration and evaluation - Disclosure of detailed information about exploration assets (Details) - CAD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Statements Line Items |  |
Beginning balance | $ 42,519 | $ 42,949
Additions | 3,784 | 201
Impairment | (42,668) | 0
Transfer to royalty, stream and other interests | 0 | (631)
Ending balance | 3,635 | 42,519
Cost [Member] |  |
Statements Line Items |  |
Beginning balance | 100,708 |
Ending balance | 104,492 | 100,708
Accumulated impairment [Member] |  |
Statements Line Items |  |
Beginning balance | (58,189) |
Ending balance | $ (100,857) | $ (58,189)

X
- Definition The amount of assets arising from the search for mineral resources, including minerals, oil, natural gas and similar non-regenerative resources after the entity has obtained legal rights to explore in a specific area, as well as the determination of the technical feasibility and commercial viability of extracting the mineral resource. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 6 -IssueDate 2021-01-01 -Paragraph 24 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=6&code=ifrs-tx-2021-en-r&anchor=para_24_b&doctype=Standard -URIDate 2021-03-24 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Additions + References No definition available. + Details
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- Definition Represents amount of impairment loss reversal of impairment loss assets arising from exploration and evaluation of mineral resources. + References No definition available. + Details
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Namespace Prefix: | or_
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- Definition Statement [Line Items] + References No definition available. + Details
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- Definition Transfer to royalty, stream and other interests. + References No definition available. + Details
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- Details
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- Details
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