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v3.20.1

Exploration and evaluation (Narrative) (Details) - CAD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Statements Line Items |  |  |
Impairment | $ 49,986 | $ 7,344 |
Impairment charge, net of income taxes | 37,600 | 5,400 |
Net book value | 42,949 | 95,002 | $ 102,182
O3 Mining Inc [Member] |  |  |
Statements Line Items |  |  |
Net book value | 31,700 | $ 34,000 |
Investments on the properties by Farmee | 2,000 |  |
Total earnout amount | 6,600 |  |
Coulon Project [Member] |  |  |
Statements Line Items |  |  |
Estimated recoverable amount | $ 10,000 |  |
Exploration Properties [Member] |  |  |
Statements Line Items |  |  |
Net smelter return on other metals and minerals | 2.00% |  |
Exploration Properties [Member] | O3 Mining Inc [Member] |  |  |
Statements Line Items |  |  |
Earn-in agreement description | O3 Mining may earn a 100% interest in most of Osisko's exploration properties located in the James Bay area and Labrador Trough (excluding the Coulon copper-zinc project) upon completing expenditures of $26.0 million over an initial 7-year period; O3 Mining may earn a first 50% interest upon completing expenditures totaling $15.6 million over an initial 4-year period. |  |
Osisko Mining [Member] | Kan property [Member] |  |  |
Statements Line Items |  |  |
Earn-in agreement description | Osisko Mining reached the minimal investment threshold on the Kan property. Therefore, a 100% interest in the Kan property was transferred to Osisko Mining (now held by O3 Mining Inc.) |  |
Net smelter return on other metals and minerals | 2.00% |  |
Bottom of range [member] | Exploration Properties [Member] |  |  |
Statements Line Items |  |  |
Net smelter return on other metals and minerals | 1.50% |  |
Bottom of range [member] | Osisko Mining [Member] | Kan property [Member] |  |  |
Statements Line Items |  |  |
Net smelter return on other metals and minerals | 1.50% |  |
Top of range [member] | Exploration Properties [Member] |  |  |
Statements Line Items |  |  |
Net smelter return on other metals and minerals | 3.50% |  |
Top of range [member] | Osisko Mining [Member] | Kan property [Member] |  |  |
Statements Line Items |  |  |
Net smelter return on other metals and minerals | 3.50% |  |

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 2018-01-01 -Paragraph 24 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=6&date=2018-03-01&anchor=para_24_b&doctype=Standard -URIDate 2018-03-16 + Details
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