XML 160 R90.htm IDEA: XBRL DOCUMENT
v3.20.1

Significant accounting policies - Disclosure of detailed information about estimated useful life or depreciation rate (Details) | 12 Months Ended
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Dec. 31, 2019
Leasehold improvements [Member] |
Significant Accounting Policies [Line Items] |
Useful life of property, plant and equipment | Lease term
Furniture and office equipment [Member] |
Significant Accounting Policies [Line Items] |
Useful life of property, plant and equipment | 3-5 years
Exploration equipment and facilities [Member] |
Significant Accounting Policies [Line Items] |
Useful life of property, plant and equipment | 3-20 years
Mining plant and equipment (development) [Member] |
Significant Accounting Policies [Line Items] |
Useful life of property, plant and equipment | 5-20 years

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- Definition The useful lives or depreciation rates used for property, plant and equipment. [Refer: Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2018-01-01 -Paragraph 73 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2018-03-01&anchor=para_73_c&doctype=Standard -URIDate 2018-03-16 + Details
Name: | ifrs-full_UsefulLivesOrDepreciationRatesPropertyPlantAndEquipment
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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

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- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=ifrs-full_LeaseholdImprovementsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=ifrs-full_OfficeEquipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=ifrs-full_ExplorationAndEvaluationAssetsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=ifrs-full_MiningPropertyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |