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OPERATING SEGMENT REPORTING (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Operating Segment Reporting      
Gold and silver sales $ 45,982 $ 5,966  
Production costs applicable to sales 34,594 3,861  
Mine construction costs 1,383 14,260 1,745
Mine development and operating costs 847 8,507  
Exploration costs 24,829 47,179 42,983
Income on investment in Minera Santa Cruz S.A., net of amortization (846) (20,835)  
Impairment of investment in MSC 95,878    
Impairment of mineral property interests and property and equipment 62,963 18,468  
Loss (gain) on sale of assets 6,743 (1,110) (36)
Operating loss (200,397) (91,405) (60,185)
Investment in Minera Santa Cruz S.A. 212,947 273,948  
Mineral property interests 642,968 767,067 245,454
Total assets 923,066 1,150,937 310,355
Argentina
      
Operating Segment Reporting      
Exploration costs 14,776 25,091  
Income on investment in Minera Santa Cruz S.A., net of amortization (846) (20,835)  
Impairment of investment in MSC 95,878    
Impairment of mineral property interests and property and equipment 27,729 179  
Loss (gain) on sale of assets 316    
Operating loss (139,784) (8,156)  
Investment in Minera Santa Cruz S.A. 212,947 273,948  
Mineral property interests 458,203 539,092  
Total assets 674,269 825,047  
Mexico
      
Operating Segment Reporting      
Gold and silver sales 45,982 5,966  
Production costs applicable to sales 34,594 3,861  
Mine construction costs 1,383 14,260 1,745
Mine development and operating costs 847 8,507  
Exploration costs 6,658 15,918 29,160
Impairment of mineral property interests and property and equipment   1,343  
Operating loss (2,998) (43,417) (35,867)
Mineral property interests 11,984 12,707 12,750
Total assets 54,131 47,359 33,899
United States
      
Operating Segment Reporting      
Exploration costs 2,952 5,060 12,825
Impairment of mineral property interests and property and equipment 35,234 16,946  
Loss (gain) on sale of assets 6,430    
Operating loss (47,422) (25,144) (15,412)
Mineral property interests 172,781 215,268 232,704
Total assets 177,248 220,148 238,402
Corporate & Other
      
Operating Segment Reporting      
Exploration costs 443 1,110 998
Loss (gain) on sale of assets (3)    
Operating loss (10,193) (14,688) (8,906)
Total assets $ 17,418 $ 58,383 $ 38,054