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OPERATING SEGMENT REPORTING (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
OPERATING SEGMENT REPORTING      
Gold and silver sales $ 5,966    
Income on investment in Minera Santa Cruz S.A., (net of amortization) 20,835    
Production costs applicable to sales 3,861    
Mine operating costs 8,507    
Mine construction costs 14,260 1,745  
Exploration costs 47,179 42,983 19,210
Operating loss (91,405) (60,185) (35,783)
Investment in Minera Santa Cruz S.A. 273,948    
Mineral property interests 767,067 245,454  
Total assets 1,150,937 310,355  
Argentina
      
OPERATING SEGMENT REPORTING      
Income on investment in Minera Santa Cruz S.A., (net of amortization) 20,835    
Exploration costs 25,091    
Operating loss (8,156)    
Investment in Minera Santa Cruz S.A. 273,948    
Mineral property interests 539,092    
Total assets 825,047    
Mexico
      
OPERATING SEGMENT REPORTING      
Gold and silver sales 5,966    
Production costs applicable to sales 3,861    
Mine operating costs 8,507    
Mine construction costs 14,260 1,745  
Exploration costs 15,918 29,160 11,467
Operating loss (43,417) (35,867) (13,127)
Mineral property interests 12,707 12,750  
Total assets 47,359 33,899  
U.S.
      
OPERATING SEGMENT REPORTING      
Exploration costs 5,060 12,825 6,975
Operating loss (25,144) (15,412) (17,240)
Mineral property interests 215,268 232,704  
Total assets 220,148 238,402  
Corporate & Other
      
OPERATING SEGMENT REPORTING      
Exploration costs 1,110 998 768
Operating loss (14,688) (8,906) (5,416)
Total assets $ 58,383 $ 38,054