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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)