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PROPERTY AND EQUIPMENT (Details) (USD $)
 3 Months Ended 6 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended
Jun. 30, 2012
Jun. 30, 2012
Dec. 31, 2011
Mar. 31, 2012
Minera Andes
Jan. 24, 2012
Minera Andes
Jun. 30, 2012
Trucks and trailers
Dec. 31, 2011
Trucks and trailers
Jun. 30, 2012
Office furniture and equipment
Dec. 31, 2011
Office furniture and equipment
Jun. 30, 2012
Drill rigs
item
Dec. 31, 2011
Drill rigs
Jun. 30, 2012
Drill rigs
Subsequent event
Jun. 30, 2012
Building
Dec. 31, 2011
Building
Jun. 30, 2012
Land
Dec. 31, 2011
Land
Jun. 30, 2012
Mining equipment
Dec. 31, 2011
Mining equipment
Jun. 30, 2012
Inactive milling equipment
Dec. 31, 2011
Inactive milling equipment
PROPERTY AND EQUIPMENT                                        
Subtotal $ 16,192,000 $ 16,192,000 $ 14,089,000     $ 1,468,000 $ 1,247,000 $ 1,012,000 $ 638,000 $ 1,869,000 $ 998,000   $ 1,469,000 $ 853,000 $ 8,669,000 $ 8,619,000 $ 956,000 $ 956,000 $ 749,000 $ 778,000
Less: accumulated depreciation (2,450,000) (2,450,000) (2,317,000)                                  
Total 13,742,000 13,742,000 11,772,000                                  
Increase in net property and equipment due to acquisition       1,600,000 1,647,000                              
Additional investment in drill rigs and accessories       1,000,000                                
Number of drill rigs sold                   4                    
Impairment 179,000 179,000               200,000                    
Proceeds from sale of drill rigs and their related accessories                       1,800,000                
Net realizable value of long-lived assets held for sale                   $ 1,800,000