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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)