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INCOME TAXES - Tax Effects of Temporary Differences (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
--- | --- | --- | --- | ---
Deferred tax assets: |  |  |  |
Net operating loss carryforward | $ 96,312 | $ 105,555 |  |
Mineral properties | 14,195 | 11,842 |  |
Other temporary differences | 1,114 | 5,371 |  |
Total gross deferred tax assets | 111,621 | 122,768 |  |
Less: valuation allowance | (111,621) | (122,768) | $ (129,794) | $ (125,202)
Deferred tax liabilities: |  |  |  |
Acquisition mineral property interests | (23,655) | (26,899) |  |
Total deferred tax liabilities | (23,655) | (26,899) |  |
Total net deferred tax liability | (23,655) | (26,899) |  |
Minera Andes |  |  |  |
Deferred tax liabilities: |  |  |  |
Acquisition mineral property interests | $ (16,300) | $ (19,800) |  |

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