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DERIVATIVE LIABILITY (Details) (USD $)
3 Months Ended 9 Months Ended 424 Months Ended 12 Months Ended
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Dec. 31, 2012
Dec. 13, 2011
Dec. 31, 2011
Livengood Gold Project, Alaska
Sep. 30, 2013
Livengood Gold Project, Alaska
DERIVATIVE LIABILITY - Livengood Gold Project                
Aggregate consideration in cash             $ 13,500,000  
Basis period of average gold price per ounce of gold is considered for calculating additional contingent payment             5 years  
Contingent payment equivalent for every dollar in excess of specified average gold price per troy ounce               23,148
Average Gold Price (in dollars per troy ounce)               720
Additional contingent payment, if the average Gold Price is less than specified price per troy ounce   0            
DERIVATIVE LIABILITY                
Derivative liability, value on initial recognition           23,100,000    
Period for projecting gold prices   5 years            
Average Gold Price five years from the date of acquisition (in dollars per ounce of gold)   1,441   1,441        
Fair value of the derivative liability                
Derivative value at beginning of the period   22,400,000            
Unrealized (gain) loss on derivative liability 4,000,000 (5,700,000) 4,300,000 (6,400,000)        
Derivative value at end of the period   $ 16,700,000   $ 16,700,000        
Average Gold Price                
Average Gold Price ($/oz.)   1,441   1,441 1,688