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SHAREHOLDERS' EQUITY (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 6 Months Ended |  |  | 1 Months Ended | 6 Months Ended | 1 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2012 | Jun. 30, 2011 | Jan. 19, 2012 | Dec. 31, 2011 | Jan. 31, 2012 Minera Andes | Jun. 30, 2012 Minera Andes | Jun. 30, 2012 Minera Andes Minimum | Jun. 30, 2012 Minera Andes Maximum | May 31, 2012 2007 Acquisitions | Jun. 30, 2012 2007 Acquisitions | Jan. 19, 2012 Series B Special Voting Preferred Stock
Common stock, shares authorized | 500,000,000 |  | 500,000,000 | 500,000,000 |  |  |  |  |  |  |
Preferred stock, shares authorized |  |  |  |  |  |  |  |  |  |  | 1
Issuance of 2012 Exchangeable Shares in connection with the acquisition of Minera Andes |  |  |  |  | 127,331,498 |  |  |  |  |  |
Exchangeable shares converted into common stock | 42,200,000 |  |  |  |  | 45,400,000 |  |  | 2,500,000 |  |
Outstanding exchangeable shares not exchanged | 85,100,000 |  |  |  |  |  |  |  |  |  |
Shares of common stock issued | 1,200,000 |  |  |  |  |  |  |  | 2,500,000 |  |
Exercise price of stock options (in dollars per share) |  |  |  |  |  |  | $ 0.91 | $ 3.35 |  |  |
Proceeds from exercise of stock options | $ 3,304 | $ 773 |  |  |  | $ 3,300 |  |  |  |  |
Shares of common stock issued as part payment for mining concessions in Mexico | 41,500 |  |  |  |  |  |  |  |  |  |

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