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Royalty, stream and other interests (Narrative) (Details) $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Apr. 30, 2021 CAD ($) Royalties | Apr. 30, 2021 USD ($) Royalties | Mar. 31, 2020 CAD ($) | Dec. 31, 2021 CAD ($) Royalties Rate | Dec. 31, 2021 USD ($) Royalties Rate | Dec. 31, 2020 CAD ($) | Dec. 31, 2020 USD ($)
Royalty, Stream And Other Interests [Line Items] |  |  |  |  |  |  |
Number of royalties acquired | Royalties | 6 | 6 |  |  |  |  |
Investments in royalty, payment | $ 32.6 | $ 26,000,000 |  |  |  |  |
Long term gold price per ounce |  | $ 700 |  |  |  |  |
Spring Valley Project [Member] |  |  |  |  |  |  |
Royalty, Stream And Other Interests [Line Items] |  |  |  |  |  |  |
Number of royalties acquired | Royalties |  |  |  | 4 | 4 |  |
Percentage of NSR acquired | Rate |  |  |  | 0.50% | 0.50% |  |
Spring Valley Project [Member] | Minimum [Member] |  |  |  |  |  |  |
Royalty, Stream And Other Interests [Line Items] |  |  |  |  |  |  |
Percentage of NSR acquired | Rate |  |  |  | 2.50% | 2.50% |  |
Spring Valley Project [Member] | Maximum [Member] |  |  |  |  |  |  |
Royalty, Stream And Other Interests [Line Items] |  |  |  |  |  |  |
Percentage of NSR acquired | Rate |  |  |  | 3.00% | 3.00% |  |
Moonlight exploration property [Member] |  |  |  |  |  |  |
Royalty, Stream And Other Interests [Line Items] |  |  |  |  |  |  |
Percentage of NSR acquired | Rate |  |  |  | 1.00% | 1.00% |  |
Almaden project [Member] |  |  |  |  |  |  |
Royalty, Stream And Other Interests [Line Items] |  |  |  |  |  |  |
Percentage of NSR acquired | Rate |  |  |  | 0.50% | 0.50% |  |
Gold and silver offtake right acquired | Rate |  |  |  | 30.00% | 30.00% |  |
Pine Point zinc project [Member] |  |  |  |  |  |  |
Royalty, Stream And Other Interests [Line Items] |  |  |  |  |  |  |
Investments in royalty, payment |  |  |  |  |  | $ 13.0 |
Percentage of NSR acquired |  |  |  |  |  | 2.00% | 2.00%
Sailfish Royalty Corp.[Member] | Tocantinzinho Gold Project [Member] |  |  |  |  |  |  |
Royalty, Stream And Other Interests [Line Items] |  |  |  |  |  |  |
Investments in royalty, payment |  |  |  | $ 12.6 | $ 10,000,000 |  |
Percentage of NSR acquired | Rate |  |  |  | 2.75% | 2.75% |  |
Net smelter return after first 1% buy-down | Rate |  |  |  | 1.75% | 1.75% |  |
Buy-down payment option to reduce royalty percentage |  |  |  |  | $ 5,500,000 |  |
Royalty percentage decrease under buy-down payment option | Rate |  |  |  | 2.00% | 2.00% |  |
Royalty interest after buy-down payment option | Rate |  |  |  | 0.75% | 0.75% |  |
Buy-down exercised early | Rate |  |  |  | 1.00% | 1.00% |  |
Falco [Member] |  |  |  |  |  |  |
Royalty, Stream And Other Interests [Line Items] |  |  |  |  |  |  |
Additional investments in royalty, stream and other interests |  |  |  | $ 10.0 |  |  |
Amount of second installment payment |  |  |  | $ 20.0 |  |  |
Barrick TZ Limited [Member] | AfriOre and Gold Rim [Member] |  |  |  |  |  |  |
Royalty, Stream And Other Interests [Line Items] |  |  |  |  |  |  |
Investments in royalty, payment |  |  |  |  | $ 11,800,000 |  |
Percentage of NSR acquired | Rate |  |  |  | 2.00% | 2.00% |  |
Barrick TZ Limited [Member] | Frontier project [Member] |  |  |  |  |  |  |
Royalty, Stream And Other Interests [Line Items] |  |  |  |  |  |  |
Percentage of NSR acquired | Rate |  |  |  | 1.00% | 1.00% |  |
Barrick TZ Limited [Member] | Central Hounde project [Member] |  |  |  |  |  |  |
Royalty, Stream And Other Interests [Line Items] |  |  |  |  |  |  |
Percentage of NSR acquired | Rate |  |  |  | 1.00% | 1.00% |  |
Caisse de depot et placement du Quebec [Member] | Teck Resources Portfolio [Member] |  |  |  |  |  |  |
Royalty, Stream And Other Interests [Line Items] |  |  |  |  |  |  |
Investments in royalty, payment |  |  |  |  |  | $ 12.5 |
Percentage of portfolio acquired |  |  |  |  |  | 15.00% | 15.00%
Regulus Resources Inc [Member] | Antakori Project [Member] |  |  |  |  |  |  |
Royalty, Stream And Other Interests [Line Items] |  |  |  |  |  |  |
Investments in royalty, payment |  |  |  |  |  | $ 16.4 | $ 12,500,000
Regulus' percentage of ownership over the AntaKori project and other claims |  |  |  |  |  | 100.00% | 100.00%
Description of royalty acquired |  |  |  |  |  | Regulus has acquired a royalty on the Mina Volare claim of the AntaKori project which represents a 1.5% or 3% NSR depending on location, from a private vendor. As per its right under the partnership, Osisko has elected to acquire 50% of the royalty for 75% of Regulus' purchase price with Osisko's acquisition cost for the royalty included in the Upfront Payment. Regulus has cancelled the remaining 50% of the royalty. As such, the royalty on the Mina Volare claim is now reduced to 0.75% or 1.5% depending on location, in favour of Osisko. | Regulus has acquired a royalty on the Mina Volare claim of the AntaKori project which represents a 1.5% or 3% NSR depending on location, from a private vendor. As per its right under the partnership, Osisko has elected to acquire 50% of the royalty for 75% of Regulus' purchase price with Osisko's acquisition cost for the royalty included in the Upfront Payment. Regulus has cancelled the remaining 50% of the royalty. As such, the royalty on the Mina Volare claim is now reduced to 0.75% or 1.5% depending on location, in favour of Osisko.
Stornoway Diamond Corporation [Member] | Renard diamond stream [Member] |  |  |  |  |  |  |
Royalty, Stream And Other Interests [Line Items] |  |  |  |  |  |  |
Impairment of royalty, stream and other interests |  |  | $ 26.3 |  |  |  |
Impairment of royalty, stream and other interests, net of tax |  |  | $ 19.3 |  |  |  |
Estimated recoverable amount |  |  |  |  |  | $ 40.0 |
Additional impairment if the diamond price was 10% lower than estimate |  |  |  |  |  | 4.1 |
Additional impairment if the diamond price was 10% lower than estimate, net of income tax |  |  |  |  |  | 3.0 |
Additional impairment if the post-tax basis discount rate was 100 basis points higher |  |  |  |  |  | 1.9 |
Additional impairment if the post-tax basis discount rate was 100 basis points higher, net of income tax |  |  |  |  |  | $ 1.4 |
Reasonable increase decrease in estimates for sensitivity analysis |  |  |  |  |  | 10.00% | 10.00%
Additional impairment if the restart scenarios was 10% more negative than management estimate |  |  |  |  |  | $ 5.5 |
Additional impairment if the restart scenarios was 10% more negative than management estimate, net of income taxes |  |  |  |  |  | $ 4.0 |
GoGold Resources Inc [Member] |  |  |  |  |  |  |
Royalty, Stream And Other Interests [Line Items] |  |  |  |  |  |  |
Percentage of gold and silver from tailings piles | Rate |  |  |  | 2.40% | 2.40% |  |
Percentage of transfer price of gold and silver spot prices | Rate |  |  |  | 30.00% | 30.00% |  |
Gibraltar Copper Mine [Member] | Taseko [Member] |  |  |  |  |  |  |
Royalty, Stream And Other Interests [Line Items] |  |  |  |  |  |  |
Reduced price paid by Osisko for each ounce of refined silver |  |  |  |  |  | from US$2.75 to nil | from US$2.75 to nil
Investments in royalty, payment |  |  |  |  |  | $ 8.5 |

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