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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) Income | Accumulated Deficit
--- | --- | --- | --- | ---
Balance at Dec. 31, 2009 | $ 203,226 | $ 501,786 | $ (285) | $ (298,275)
Balance (in shares) at Dec. 31, 2009 |  | 121,893,000 |  |
Increase (Decrease) in Shareholders' Equity |  |  |  |
Stock-based compensation | 1,595 | 1,595 |  |
Exercise of stock options | 201 | 201 |  |
Exercise of stock options (in shares) | 109,000 | 109,000 |  |
Exercise of stock options assumed from 2007 acquisition and Minera Andes Inc. acquisition | 608 | 608 |  |
Exercise of stock options assumed from 2007 acquisition and Minera Andes Inc. acquisition (in shares) |  | 143,000 |  |
Shares issued for Mexico mining concessions | 199 | 199 |  |
Shares issued for Mexico mining concessions (in shares) |  | 41,000 |  |
Unrealized (loss) gain on marketable equity securities, net of taxes | 542 |  | 542 |
Net loss | (33,091) |  |  | (33,091)
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 | 2,671 | 2,671 |  |
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 | 163,000 |  |
Exercise of stock options assumed from 2007 acquisition and Minera Andes Inc. acquisition | 361 | 361 |  |
Exercise of stock options assumed from 2007 acquisition and Minera Andes Inc. acquisition (in shares) |  | 70,000 |  |
Shares issued for Mexico mining concessions | 583 | 583 |  |
Shares issued for Mexico mining concessions (in shares) | 84,000 | 84,000 |  |
Unrealized (loss) gain on marketable equity securities, net of taxes | (1,546) |  | (1,546) |
Net loss | (61,872) |  |  | (61,872)
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 | 3,405 | 3,405 |  |
Issuance of exchangeable shares to acquire Minera Andes Inc. | 664,671 | 664,671 |  |
Issuance of exchangeable shares to acquire Minera Andes Inc. (in shares) | 7,800,000 | 127,331,000 |  |
Assumption of stock options in connection with the acquisition of Minera Andes Inc. | 3,175 | 3,175 |  |
Sale of shares for cash, net of issuance costs | 43,047 | 43,047 |  |
Sale of shares for cash, net of issuance costs (in shares) | 19,552,000 | 19,552,000 |  |
Sale of exchangeable shares for cash, net of issuance costs | 17,372 | 17,372 |  |
Sale of exchangeable shares for cash, net of issuance costs (in shares) | 7,800,000 | 7,799,000 |  |
Exercise of stock options | 819 | 819 |  |
Exercise of stock options (in shares) | 445,000 | 445,000 |  |
Exercise of stock options assumed from 2007 acquisition and Minera Andes Inc. acquisition | 3,066 | 3,066 |  |
Exercise of stock options assumed from 2007 acquisition and Minera Andes Inc. acquisition (in shares) |  | 1,062,000 |  |
Shares issued for Mexico mining concessions | 391 | 391 |  |
Shares issued for Mexico mining concessions (in shares) | 83,000 | 83,000 |  |
Unrealized (loss) gain on marketable equity securities, net of taxes | (5) |  | (5) |
Reclassification of unrealized loss on marketable equity securities disposed of during the year, net of tax | (993) |  | (993) |
Other-than-temporary impairment on marketable equity securities | 1,993 |  | 1,993 |
Net loss | (66,654) |  |  | (66,654)
Balance at Dec. 31, 2012 | $ 889,591 | $ 1,349,777 | $ (294) | $ (459,892)
Balance (in shares) at Dec. 31, 2012 |  | 296,025,000 |  |

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