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COMMITMENTS AND CONTINGENCIES - Lease Obligations and Purchase Commitments (Details) CAD in Thousands, $ in Thousands |  |  | 12 Months Ended
--- | --- | --- | ---
Dec. 19, 2017 CAD | Dec. 19, 2017 USD ($) | Sep. 22, 2017 USD ($) | Dec. 31, 2017 USD ($)
Operating lease obligations (office rent) |  |  |  |
2018 |  |  |  | $ 400
2019 |  |  |  | 368
2020 |  |  |  | 300
2021 |  |  |  | 240
2022 |  |  |  | 230
Thereafter |  |  |  | 197
Total |  |  |  | 1,735
Operating lease obligations (mining and surface rights) |  |  |  |
2018 |  |  |  | 3,994
2019 |  |  |  | 436
2020 |  |  |  | 442
2021 |  |  |  | 442
2022 |  |  |  | 437
Total |  |  |  | 5,751
Exploration |  |  |  |
2018 |  |  |  | 11,554
Total |  |  |  | 11,554
Construction |  |  |  |
2018 |  |  |  | 11,344
Total |  |  |  | 11,344
Reclamation costs |  |  |  |
2018 |  |  |  | 639
2019 |  |  |  | 448
2020 |  |  |  | 3,883
2021 |  |  |  | 3,974
2022 |  |  |  | 3,181
Thereafter |  |  |  | 30,807
Total |  |  |  | 42,932
Total |  |  |  |
2018 |  |  |  | 27,931
2019 |  |  |  | 1,252
2020 |  |  |  | 4,625
2021 |  |  |  | 4,656
2022 |  |  |  | 3,848
Thereafter |  |  |  | 31,004
Total |  |  |  | 73,316
Shares issued in connection with the equity issuance |  |  | $ 43,200 |
Flow Through Common Shares |  |  |  |
Total |  |  |  |
Shares issued in connection with the equity issuance | CAD 12,880 | $ 10,000 |  | $ 7,799

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