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INCOME TAXES - Tax Effects of Temporary Differences (Details) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
--- | --- | --- | --- | ---
Deferred tax assets: |  |  |  |
Net operating loss carryforward | $ 105,555 | $ 108,070 |  |
Mineral properties | 11,842 | 14,797 |  |
Other temporary differences | 5,371 | 7,141 |  |
Total gross deferred tax assets | 122,768 | 130,008 |  |
Less: valuation allowance | (122,768) | (129,794) | $ (125,202) | $ (90,477)
Net deferred tax assets |  | 214 |  |
Deferred tax liabilities: |  |  |  |
Investments |  | (214) |  |
Acquisition mineral property interests | (26,899) | (51,899) |  |
Total deferred tax liabilities | (26,899) | (52,113) |  |
Total net deferred tax liability | (26,899) | (51,899) |  |
Minera Andes |  |  |  |
Deferred tax liabilities: |  |  |  |
Acquisition mineral property interests | $ (19,800) | $ (26,600) |  |

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