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PROPERTY AND EQUIPMENT (Details) (USD $) | 3 Months Ended | 9 Months Ended |  | 3 Months Ended |  |  |  |  | 3 Months Ended |  | 3 Months Ended |  |  |  |  |  |  |  |  | 3 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2012 | Sep. 30, 2012 | Dec. 31, 2011 | Mar. 31, 2012 Minera Andes | Sep. 30, 2012 Trucks and trailers | Dec. 31, 2011 Trucks and trailers | Sep. 30, 2012 Office furniture and equipment | Dec. 31, 2011 Office furniture and equipment | Sep. 30, 2012 Drill rigs | Jun. 30, 2012 Drill rigs item | Dec. 31, 2011 Drill rigs | Mar. 31, 2012 Drill rigs Minera Andes | Sep. 30, 2012 Building | Dec. 31, 2011 Building | Sep. 30, 2012 Land | Dec. 31, 2011 Land | Sep. 30, 2012 Mining equipment | Dec. 31, 2011 Mining equipment | Sep. 30, 2012 Inactive milling equipment | Dec. 31, 2011 Inactive milling equipment | Sep. 30, 2012 Inactive milling equipment, mobile homes and vehicles
PROPERTY AND EQUIPMENT |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subtotal | $ 16,148,000 | $ 16,148,000 | $ 14,089,000 |  | $ 1,417,000 | $ 1,247,000 | $ 1,054,000 | $ 638,000 | $ 1,869,000 |  | $ 998,000 |  | $ 1,469,000 | $ 853,000 | $ 8,669,000 | $ 8,619,000 | $ 1,026,000 | $ 956,000 | $ 644,000 | $ 778,000 |
Less: accumulated depreciation | (2,665,000) | (2,665,000) | (2,317,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total | 13,483,000 | 13,483,000 | 11,772,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100,000
Additional investment in property and equipment |  |  |  | 1,600,000 |  |  |  |  |  |  |  | 1,000,000 |  |  |  |  |  |  |  |  |
Number of drill rigs sold |  |  |  |  |  |  |  |  |  | 4 |  |  |  |  |  |  |  |  |  |  |
Impairment | 2,902,000 | 3,081,000 |  |  |  |  |  |  |  | 200,000 |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of productive assets |  |  |  |  |  |  |  |  | 1,800,000 |  |  |  |  |  |  |  |  |  |  |  | 1,400,000
Net realizable value of long-lived assets held for sale |  |  |  |  |  |  |  |  |  | $ 1,800,000 |  |  |  |  |  |  |  |  |  |  |

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