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Significant accounting policies (Tables) | 12 Months Ended
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Dec. 31, 2019
Significant Accounting Policies [Abstract] |
Disclosure of principal subsidiaries and their geographic location [Table Text Block] |
Entity | Jurisdiction
Osisko Bermuda Limited | Bermuda
Barkerville Gold Mines Ltd.(i) | British Columbia
Coulon Mines Inc. | Canada
General Partnership Osisko James Bay | Québec
Osisko Mining (USA) Inc. | Delaware
(i) From November 21, 2019 (Note 7).
Disclosure of detailed Information about financial instruments [Table Text Block] |
Category | Financial instrument
Financial assets at amortized cost | Bank balances and cash on hand
| Short-term debt securities
| Notes and loans receivable
| Trade receivables
| Interest and dividend income receivable
| Amounts receivable from associates and other receivables
| Reclamation deposits (term deposits)
Financial assets at fair value through profit or loss | Investments in derivatives and convertible debentures
Financial assets at fair value through other comprehensive income or loss | Investments in shares and equity instruments, other than in derivatives
Financial liabilities at amortized cost | Accounts payable and accrued liabilities
| Liability component of convertible debentures
| Borrowings under revolving credit facilities
Disclosure of detailed information about estimated useful life or depreciation rate [Table Text Block] | Leasehold improvements Lease term Furniture and office equipment 3-5 years Exploration equipment and facilities 3-20 years Mining plant and equipment (development) 5-20 years

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