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COMMITMENTS (Tables) | 12 Months Ended
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Dec. 31, 2018
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Summary of Continuity of the Flow-through Share Premium Liability | A continuity of the flow-through share premium liability is as follows:
|  | Year ended |  |  | Year ended |
|  | December 31, 2018 |  |  | December 31, 2017 |
Balance, beginning of the period |  | $ | 109,251 |  |  | $ | 179,212 |
Liability incurred on flow-through shares issued |  |  | 784,892 |  |  |  | 130,000 |
Settlement of flow-through share premium liability on expenditures made |  |  | (343,751 | ) |  |  | (199,961 | )
Balance, end of the period |  | $ | 550,392 |  |  | $ | 109,251 |
Summary of Total Office Lease Commitments | The Company and its subsidiary, IsoEnergy, have total office lease commitments at their Vancouver and Saskatoon offices as follows:
2019 |  | $ | 1,033,557 |
2020 |  | $ | 955,935 |
2021 |  | $ | 756,469 |
2022 |  | $ | 772,552 |
2023 |  | $ | 697,626 |
2024 |  | $ | 659,397 |
2025 |  | $ | 659,397 |

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