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Disclosure of range of exercise prices of outstanding share options (Details) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2018 CAD ($) Share | Dec. 31, 2017 Share | Dec. 31, 2016 Share | Dec. 31, 2015 Share
Statements Line Items |  |  |  |
Number of share options outstanding in share-based payment arrangement | 6,742,500 | 5,247,500 | 4,811,500 | 5,428,500
Number of share options exercisable in share-based payment arrangement | 6,730,000 |  |  |
Granted April 25, 2014 [Member] |  |  |  |
Statements Line Items |  |  |  |
Number of share options outstanding in share-based payment arrangement | 1,167,500 |  |  |
Number of share options exercisable in share-based payment arrangement | 1,167,500 |  |  |
Exercise price of outstanding share options | $ | $ 1.20 |  |  |
Expiry Date | April 25, 2019 |  |  |
Granted December 22, 2014 [Member] |  |  |  |
Statements Line Items |  |  |  |
Number of share options outstanding in share-based payment arrangement | 60,000 |  |  |
Number of share options exercisable in share-based payment arrangement | 60,000 |  |  |
Exercise price of outstanding share options | $ | $ 0.87 |  |  |
Expiry Date | December 22, 2019 |  |  |
Granted June 8, 2015 [Member] |  |  |  |
Statements Line Items |  |  |  |
Number of share options outstanding in share-based payment arrangement | 1,065,000 |  |  |
Number of share options exercisable in share-based payment arrangement | 1,065,000 |  |  |
Exercise price of outstanding share options | $ | $ 0.66 |  |  |
Expiry Date | June 8, 2020 |  |  |
Granted October 18, 2016 [Member] |  |  |  |
Statements Line Items |  |  |  |
Number of share options outstanding in share-based payment arrangement | 1,200,000 |  |  |
Number of share options exercisable in share-based payment arrangement | 1,200,000 |  |  |
Exercise price of outstanding share options | $ | $ 1.30 |  |  |
Expiry Date | October 18, 2021 |  |  |
Granted August 28, 2017 [Member] |  |  |  |
Statements Line Items |  |  |  |
Number of share options outstanding in share-based payment arrangement | 1,440,000 |  |  |
Number of share options exercisable in share-based payment arrangement | 1,440,000 |  |  |
Exercise price of outstanding share options | $ | $ 1.20 |  |  |
Expiry Date | August 28, 2022 |  |  |
Granted July 20, 2018 [Member] |  |  |  |
Statements Line Items |  |  |  |
Number of share options outstanding in share-based payment arrangement | 1,640,000 |  |  |
Number of share options exercisable in share-based payment arrangement | 1,627,500 |  |  |
Exercise price of outstanding share options | $ | $ 1.30 |  |  |
Expiry Date | July 20, 2023 |  |  |
Granted September 20, 2018 [Member] |  |  |  |
Statements Line Items |  |  |  |
Number of share options outstanding in share-based payment arrangement | 75,000 |  |  |
Number of share options exercisable in share-based payment arrangement | 75,000 |  |  |
Exercise price of outstanding share options | $ | $ 1.42 |  |  |
Expiry Date | September 20, 2023 |  |  |
Granted November 28, 2018 [Member] |  |  |  |
Statements Line Items |  |  |  |
Number of share options outstanding in share-based payment arrangement | 75,000 |  |  |
Number of share options exercisable in share-based payment arrangement | 75,000 |  |  |
Exercise price of outstanding share options | $ | $ 1.57 |  |  |
Expiry Date | November 28, 2023 |  |  |
Granted December 14,2018 [Member] |  |  |  |
Statements Line Items |  |  |  |
Number of share options outstanding in share-based payment arrangement | 20,000 |  |  |
Number of share options exercisable in share-based payment arrangement | 20,000 |  |  |
Exercise price of outstanding share options | $ | $ 1.42 |  |  |
Expiry Date | December 14, 2023 |  |  |

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