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OPERATING SEGMENT REPORTING (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
OPERATING SEGMENT REPORTING          
Income on investment in Minera Santa Cruz S.A. $ 11,311   $ 14,759    
Gold and silver sales 456   456    
Production costs applicable to sales 119   119    
Exploration costs 6,708 15,115 28,565 32,650  
Mine construction costs 4,671   13,306    
Mine development and operating costs 2,406   8,622    
Operating income (loss) (10,554) (21,239) (56,817) (44,124)  
Investment in Minera Santa Cruz S.A. 271,180   271,180    
Mineral property interests 785,278   785,278   245,454
Total assets 1,111,205   1,111,205   310,355
Argentina
          
OPERATING SEGMENT REPORTING          
Income on investment in Minera Santa Cruz S.A. 11,311   14,759    
Exploration costs 1,539   11,369    
Operating income (loss) 9,200   1,231    
Investment in Minera Santa Cruz S.A. 271,180   271,180    
Mineral property interests 541,702   541,702    
Total assets 831,129   831,129    
Mexico
          
OPERATING SEGMENT REPORTING          
Gold and silver sales 456   456    
Production costs applicable to sales 119   119    
Exploration costs 3,847 10,822 12,394 22,846  
Mine construction costs 4,671   13,306    
Mine development and operating costs 2,406   8,622    
Operating income (loss) (12,650) (12,196) (38,733) (25,728)  
Mineral property interests 14,050   14,050   12,750
Total assets 42,717   42,717   33,899
U.S.
          
OPERATING SEGMENT REPORTING          
Exploration costs 999 4,114 3,905 9,066  
Operating income (loss) (4,234) (5,736) (7,864) (11,710)  
Mineral property interests 229,526   229,526   232,704
Total assets 234,804   234,804   238,402
Corporate & Other
          
OPERATING SEGMENT REPORTING          
Exploration costs 323 179 897 738  
Operating income (loss) (2,870) (3,307) (11,451) (6,686)  
Total assets $ 2,555   $ 2,555   $ 38,054