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PROPERTY AND EQUIPMENT (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
PROPERTY AND EQUIPMENT      
Subtotal $ 18,443 $ 15,714  
Less: accumulated depreciation (3,300) (2,947)  
Total 15,143 12,767  
Depreciation expense 942 1,033 577
El Gallo 2 project
     
PROPERTY AND EQUIPMENT      
Number of drill rigs sold 2    
Trucks and trailers
     
PROPERTY AND EQUIPMENT      
Subtotal 1,041 1,417  
Office furniture and equipment
     
PROPERTY AND EQUIPMENT      
Subtotal 1,163 1,163  
Drill rigs
     
PROPERTY AND EQUIPMENT      
Subtotal 998 1,869  
Building
     
PROPERTY AND EQUIPMENT      
Subtotal 1,469 1,469  
Land
     
PROPERTY AND EQUIPMENT      
Subtotal 8,672 8,669  
Mining equipment
     
PROPERTY AND EQUIPMENT      
Subtotal 1,206 1,026  
Construction in process
     
PROPERTY AND EQUIPMENT      
Subtotal 3,894    
Inactive milling equipment
     
PROPERTY AND EQUIPMENT      
Subtotal   $ 101