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INCOME AND MINING TAXES - Tax Effects of Temporary Differences (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | --- | ---
Deferred tax assets: |  |  |  |
Net operating loss carryforward | $ 72,078 | $ 96,312 |  |
Mineral properties | 59,905 | 14,195 |  |
Other temporary differences | 862 | 1,114 |  |
Total gross deferred tax assets | 132,845 | 111,621 |  |
Less: valuation allowance | (123,648) | (111,621) | $ (122,768) | $ (129,794)
Net deferred tax assets | 9,197 |  |  |
Deferred tax liabilities: |  |  |  |
Acquisition mineral property interests | (17,627) | (23,655) |  |
Total deferred tax liabilities | (17,627) | (23,655) |  |
Total net deferred tax liability | (8,430) | (23,655) |  |
Minera Andes |  |  |  |
Deferred tax liabilities: |  |  |  |
Acquisition related deferred tax liability | 6,200 | $ 12,600 |  |
Gold Bar project |  |  |  |
Deferred tax assets: |  |  |  |
Net deferred tax assets | $ 6,400 |  |  |

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