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COMMITMENTS AND CONTINGENCIES (Tables) | 12 Months Ended
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Dec. 31, 2018
RENTAL EXPENSE, COMMITMENTS AND CONTINGENCIES |
Schedule of minimum amounts under purchase commitments, long term leases covering office space, exploration expenditures, option payments on properties |
|  | Payments due by period
|  | 2019 |  | 2020 |  | 2021 |  | 2022 |  | 2023 |  | Thereafter |  | Total
Operating lease obligations (office rent) |  | $ | 374 |  | $ | 322 |  | $ | 263 |  | $ | 252 |  | $ | 256 |  | $ | 143 |  | $ | 1,610
Operating lease obligations (mining and surface rights) |  |  | 2,524 |  |  | 453 |  |  | 460 |  |  | 460 |  |  | 454 |  |  | — |  |  | 4,351
Exploration (including $14.9 million flow-through shares) |  |  | 15,115 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 15,115
Construction |  |  | 6,044 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 6,044
Reclamation costs(1) |  |  | 726 |  |  | 1,561 |  |  | 2,890 |  |  | 5,860 |  |  | 141 |  |  | 33,211 |  |  | 44,389
Long-term debt |  |  | 4,875 |  |  | 14,725 |  |  | 41,993 |  |  | — |  |  | — |  |  | — |  |  | 61,593
Total |  | $ | 29,658 |  | $ | 17,061 |  | $ | 45,606 |  | $ | 6,572 |  | $ | 851 |  | $ | 33,354 |  | $ | 133,102
| (1) |  | Amounts presented represent the undiscounted uninflated future payments.

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- Definition Tabular disclosure of the aggregate amount of payments due on known contractual obligations for the five years following the date of the latest balance sheet and the combined aggregate amount of maturities of known contractual obligations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 303 -Paragraph a -Subparagraph 5 + Details
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