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OPERATING SEGMENT REPORTING (Details) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
OPERATING SEGMENT REPORTING          
Income on investment in Minera Santa Cruz S.A. $ (208,000) $ 0 $ 990,000    
Exploration costs 10,073,000 10,626,000 21,857,000 17,535,000  
Mine construction costs 6,994,000   8,635,000    
Mine operating costs 3,494,000   6,216,000    
Operating loss (25,746,000) (13,408,000) (48,721,000) (22,885,000)  
Investment in Minera Santa Cruz S.A. 225,989,000   225,989,000    
Mineral property interests 843,764,000   843,764,000   245,454,000
Total assets 1,137,218,000   1,137,218,000   310,355,000
Argentina
          
OPERATING SEGMENT REPORTING          
Income on investment in Minera Santa Cruz S.A. (208,000)   990,000    
Exploration costs 5,025,000   9,830,000    
Operating loss (6,153,000)   (10,427,000)    
Investment in Minera Santa Cruz S.A. 225,989,000   225,989,000    
Mineral property interests 597,374,000   597,374,000    
Total assets 843,476,000   843,476,000    
Mexico
          
OPERATING SEGMENT REPORTING          
Exploration costs 3,792,000 7,185,000 8,547,000 12,024,000  
Mine construction costs 6,994,000   8,635,000    
Mine operating costs 3,494,000   6,216,000    
Operating loss (15,268,000) (7,639,000) (26,083,000) (13,532,000)  
Mineral property interests 13,735,000   13,735,000   12,750,000
Total assets 39,552,000   39,552,000   33,899,000
U.S.
          
OPERATING SEGMENT REPORTING          
Exploration costs 1,092,000 3,144,000 2,906,000 4,952,000  
Operating loss (1,301,000) (4,175,000) (3,630,000) (5,974,000)  
Mineral property interests 232,655,000   232,655,000   232,704,000
Total assets 237,926,000   237,926,000   238,402,000
Corporate & Other
          
OPERATING SEGMENT REPORTING          
Exploration costs 164,000 297,000 574,000 559,000  
Operating loss (3,024,000) (1,594,000) (8,581,000) (3,379,000)  
Total assets $ 16,264,000   $ 16,264,000   $ 38,054,000