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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

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