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CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (USD $) In Thousands, except Share data, unless otherwise specified | Total | Common Stock | Accumulated Other Comprehensive Loss | Accumulated Deficit
--- | --- | --- | --- | ---
Balance at Dec. 31, 2010 | $ 173,280 | $ 504,389 | $ 257 | $ (331,366)
Balance (in shares) at Dec. 31, 2010 |  | 122,186,000 |  |
Increase (Decrease) in Shareholders' Equity |  |  |  |
Stock-based compensation | 1,905 | 1,905 |  |
Sale of shares for cash, net of issuance costs | 105,415 | 105,415 |  |
Sale of shares for cash, net of issuance costs (in shares) |  | 17,250,000 |  |
Exercise of stock options | 412 | 412 |  |
Exercise of stock options (in shares) |  | 163,000 |  |
Exercise of stock options from 2007 acquisition and Minera Andes Inc. | 361 | 361 |  |
Exercise of stock options from 2007 acquisition and Minera Andes Inc. (in shares) |  | 70,000 |  |
Shares issued for Mexico mining concessions | 582 | 582 |  |
Shares issued for Mexico mining concessions (in shares) |  | 84,000 |  |
Unrealized loss on marketable equity securities | (777) |  | (777) |
Net loss | (45,568) |  |  | (45,568)
Balance at Sep. 30, 2011 | 235,610 | 613,064 | (520) | (376,934)
Balance (in shares) at Sep. 30, 2011 |  | 139,753,000 |  |
Balance at Dec. 31, 2011 | 219,304 | 613,831 | (1,289) | (393,238)
Balance (in shares) at Dec. 31, 2011 |  | 139,753,000 |  |
Increase (Decrease) in Shareholders' Equity |  |  |  |
Stock-based compensation | 2,845 | 2,845 |  |
Issuance of exchangeable shares to acquire Minera Andes Inc. | 664,671 | 664,671 |  |
Issuance of exchangeable shares to acquire Minera Andes Inc. (in shares) |  | 127,331,000 |  |
Assumption of stock options in connection with the acquisition of Minera Andes Inc. | 3,175 | 3,175 |  |
Exercise of stock options | 721 | 721 |  |
Exercise of stock options (in shares) | 1,300,000 | 387,000 |  |
Exercise of stock options from 2007 acquisition and Minera Andes Inc. | 2,844 | 2,844 |  |
Exercise of stock options from 2007 acquisition and Minera Andes Inc. (in shares) |  | 942,000 |  |
Shares issued for Mexico mining concessions | 391 | 391 |  |
Shares issued for Mexico mining concessions (in shares) | 83,000 | 83,000 |  |
Unrealized loss on marketable equity securities | (2) |  | (2) |
Reclassification of unrealized loss on marketable equity securities disposed of during the period, net of tax | (993) |  | (993) |
Other-than-temporary impairment on marketable equity securities | 1,993 |  | 1,993 |
Net loss | (40,578) |  |  | (40,578)
Balance at Sep. 30, 2012 | $ 854,371 | $ 1,288,478 | $ (291) | $ (433,816)
Balance (in shares) at Sep. 30, 2012 |  | 268,496,000 |  |

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