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INCOME AND MINING TAXES - Reconciliation of Tax Provision (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
INCOME AND MINING TAXES. |  |  |
Loss before income and mining taxes | $ (63,591) | $ (47,640) | $ (26,003)
Statutory tax rate (as a percent) | 21.00% | 21.00% | 35.00%
US Federal and State tax recovery (expense) at statutory rate | $ (13,354) | $ (10,004) | $ (9,101)
Reconciling items: |  |  |
Equity pickup in MSC | 2,626 | 2,966 | (16)
Deferred foreign income inclusion | 598 | 5,963 | 21,002
Realized flow-through expenditures | 3,150 | 2,100 |
Realized flow-through premium | (2,954) | (1,675) |
Foreign tax credits |  |  | (16,628)
Tax rate changes | 976 |  | 28,048
Adjustment for foreign tax rates | (200) | 40 | 115
Other permanent differences | 8,540 | 4,419 | (1,761)
Unrealized foreign exchange rate (loss)/gain | (1,095) | (6,935) | 2,469
NOL expires and revisions | 810 | (120) | (2,806)
Valuation allowance | (2,941) | 476 | (36,691)
Tax benefit | $ (3,844) | $ (2,770) | $ (15,369)

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