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Long-term debt - Disclosure of detailed information of long-term debt, activity (Details) - CAD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Disclosure of detailed information about borrowings [line items] |  |
Balance - January 1 | $ 400,429 | $ 349,042
Increase in revolving credit facility | 50,000 | 71,660
Decrease in revolving credit facility | (50,000) | (19,205)
Mining equipment financings, net | 3,764 | 0
Amortization of transaction costs | 2,204 | 2,238
Accretion expense | 4,308 | 4,972
Foreign exchange revaluation impact | (270) | (8,278)
Balance - December 31 | $ 410,435 | $ 400,429

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- Definition The amount of outstanding funds that the entity is obligated to repay. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_55&doctype=Standard -URIDate 2021-03-24 + Details
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Namespace Prefix: | ifrs-full_
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Balance Type: | credit
Period Type: | instant

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table. + References No definition available. + Details
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- Definition Accretion expense + References No definition available. + Details
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Namespace Prefix: | or_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Amortization of transaction costs + References No definition available. + Details
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Namespace Prefix: | or_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Represents amount of decrease in revolving credit facility. + References No definition available. + Details
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Namespace Prefix: | or_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Foreign exchange revaluation impact + References No definition available. + Details
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Namespace Prefix: | or_
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Balance Type: | credit
Period Type: | duration

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- Definition Represents amount of increase in revolving credit facility. + References No definition available. + Details
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Namespace Prefix: | or_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Represents amount of mining equipment financings, net. + References No definition available. + Details
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Namespace Prefix: | or_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration