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Fair value of financial instruments - Disclosure of significant observable inputs used in fair value measurement of equity (Details) - CAD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Disclosure of fair value measurement of assets [line items] |  |
Total financial assets | $ 59,109 | $ 107,403
Warrants and call options on equity securities [Member] | Publicly traded mining exploration and development, precious metals [Member] |  |
Disclosure of fair value measurement of assets [line items] |  |
Financial assets at fair value through profit or loss | 1,067 | 3,322
Warrants and call options on equity securities [Member] | Publicly traded mining exploration and development, other minerals, oil and gas [Member] |  |
Disclosure of fair value measurement of assets [line items] |  |
Financial assets at fair value through profit or loss | 633 | 26
Equity securities [Member] | Publicly traded mining exploration and development, precious metals [Member] |  |
Disclosure of fair value measurement of assets [line items] |  |
Financial assets at fair value through other comprehensive income | 48,295 | 35,544
Equity securities [Member] | Publicly traded mining exploration and development, other minerals, oil and gas [Member] |  |
Disclosure of fair value measurement of assets [line items] |  |
Financial assets at fair value through other comprehensive income | 9,114 | 12,259
Equity securities [Member] | Private mining exploration and development, precious metals [Member] |  |
Disclosure of fair value measurement of assets [line items] |  |
Financial assets at fair value through other comprehensive income |  | 56,252
Level 1 [Member] |  |
Disclosure of fair value measurement of assets [line items] |  |
Total financial assets | 57,409 | 47,803
Level 1 [Member] | Warrants and call options on equity securities [Member] | Publicly traded mining exploration and development, precious metals [Member] |  |
Disclosure of fair value measurement of assets [line items] |  |
Financial assets at fair value through profit or loss | 0 | 0
Level 1 [Member] | Warrants and call options on equity securities [Member] | Publicly traded mining exploration and development, other minerals, oil and gas [Member] |  |
Disclosure of fair value measurement of assets [line items] |  |
Financial assets at fair value through profit or loss | 0 | 0
Level 1 [Member] | Equity securities [Member] | Publicly traded mining exploration and development, precious metals [Member] |  |
Disclosure of fair value measurement of assets [line items] |  |
Financial assets at fair value through other comprehensive income | 48,295 | 35,544
Level 1 [Member] | Equity securities [Member] | Publicly traded mining exploration and development, other minerals, oil and gas [Member] |  |
Disclosure of fair value measurement of assets [line items] |  |
Financial assets at fair value through other comprehensive income | 9,114 | 12,259
Level 1 [Member] | Equity securities [Member] | Private mining exploration and development, precious metals [Member] |  |
Disclosure of fair value measurement of assets [line items] |  |
Financial assets at fair value through other comprehensive income |  | 0
Level 2 [Member] |  |
Disclosure of fair value measurement of assets [line items] |  |
Total financial assets | 0 | 0
Level 2 [Member] | Warrants and call options on equity securities [Member] | Publicly traded mining exploration and development, precious metals [Member] |  |
Disclosure of fair value measurement of assets [line items] |  |
Financial assets at fair value through profit or loss | 0 | 0
Level 2 [Member] | Warrants and call options on equity securities [Member] | Publicly traded mining exploration and development, other minerals, oil and gas [Member] |  |
Disclosure of fair value measurement of assets [line items] |  |
Financial assets at fair value through profit or loss | 0 | 0
Level 2 [Member] | Equity securities [Member] | Publicly traded mining exploration and development, precious metals [Member] |  |
Disclosure of fair value measurement of assets [line items] |  |
Financial assets at fair value through other comprehensive income | 0 | 0
Level 2 [Member] | Equity securities [Member] | Publicly traded mining exploration and development, other minerals, oil and gas [Member] |  |
Disclosure of fair value measurement of assets [line items] |  |
Financial assets at fair value through other comprehensive income | 0 | 0
Level 2 [Member] | Equity securities [Member] | Private mining exploration and development, precious metals [Member] |  |
Disclosure of fair value measurement of assets [line items] |  |
Financial assets at fair value through other comprehensive income |  | 0
Level 3 [Member] |  |
Disclosure of fair value measurement of assets [line items] |  |
Total financial assets | 1,700 | 59,600
Level 3 [Member] | Warrants and call options on equity securities [Member] | Publicly traded mining exploration and development, precious metals [Member] |  |
Disclosure of fair value measurement of assets [line items] |  |
Financial assets at fair value through profit or loss | 1,067 | 3,322
Level 3 [Member] | Warrants and call options on equity securities [Member] | Publicly traded mining exploration and development, other minerals, oil and gas [Member] |  |
Disclosure of fair value measurement of assets [line items] |  |
Financial assets at fair value through profit or loss | 633 | 26
Level 3 [Member] | Equity securities [Member] | Publicly traded mining exploration and development, precious metals [Member] |  |
Disclosure of fair value measurement of assets [line items] |  |
Financial assets at fair value through other comprehensive income | 0 | 0
Level 3 [Member] | Equity securities [Member] | Publicly traded mining exploration and development, other minerals, oil and gas [Member] |  |
Disclosure of fair value measurement of assets [line items] |  |
Financial assets at fair value through other comprehensive income | $ 0 | 0
Level 3 [Member] | Equity securities [Member] | Private mining exploration and development, precious metals [Member] |  |
Disclosure of fair value measurement of assets [line items] |  |
Financial assets at fair value through other comprehensive income |  | $ 56,252

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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
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- Definition The amount of assets that are: (a) cash; (b) an equity instrument of another entity; (c) a contractual right: (i) to receive cash or another financial asset from another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially favourable to the entity; or (d) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to receive a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose the entity’s own equity instruments do not include puttable financial instruments classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. [Refer: Financial instruments, class [member]; Financial liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 25 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_25&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 35H -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_35H&doctype=Standard -URIDate 2018-03-16 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 35I -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_35I&doctype=Standard -URIDate 2018-03-16 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 35M -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_35M&doctype=Standard -URIDate 2018-03-16 Reference 5: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 35N -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_35N&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amount of financial assets at fair value through other comprehensive income. [Refer: At fair value [member]; Financial assets; Other comprehensive income] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 8 -Subparagraph h -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_8_h&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amount of financial assets that are measured at fair value and for which gains (losses) are recognised in profit or loss. A financial asset shall be measured at fair value through profit or loss unless it is measured at amortised cost or at fair value through other comprehensive income. A gain (loss) on a financial asset measured at fair value shall be recognised in profit or loss unless it is part of a hedging relationship, it is an investment in an equity instrument for which the entity has elected to present gains and losses in other comprehensive income or it is a financial asset measured at fair value through other comprehensive income. [Refer: At fair value [member]; Financial assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 8 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_8_a&doctype=Standard -URIDate 2018-03-16 + Details
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