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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, 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 Minera Andes Inc. acquisition | 361 | 361 |  |
Exercise of stock options assumed from 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 |  |
Unrealized (loss) gain on available-for-sale 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) |  | 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 |  |
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) |  | 7,799,000 |  |
Exercise of stock options | 819 | 819 |  |
Exercise of stock options (in shares) | 445,000 | 445,000 |  |
Exercise of stock options assumed from Minera Andes Inc. acquisition | 3,066 | 3,066 |  |
Exercise of stock options assumed from 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 |  |
Unrealized (loss) gain on available-for-sale securities, net of taxes | (5) |  | (5) |
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 | (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 |  |
Increase (Decrease) in Shareholders' Equity |  |  |  |
Stock-based compensation | 1,382 | 1,382 |  |
Exercise of stock options | 95 | 95 |  |
Exercise of stock options (in shares) | 48,000 | 48,000 |  |
Exercise of stock options assumed from Minera Andes Inc. acquisition | 76 | 76 |  |
Exercise of stock options assumed from Minera Andes Inc. acquisition (in shares) |  | 45,000 |  |
Shares issued for litigation settlement | 3,270 | 3,270 |  |
Shares issued for litigation settlement (in shares) |  | 1,000,000 |  |
Shares issued for Mexico mining concessions | 96 | 96 |  |
Shares issued for Mexico mining concessions (in shares) | 41,500 | 41,000 |  |
Unrealized (loss) gain on available-for-sale securities, net of taxes | (1) |  | (1) |
Net loss | (147,742) |  |  | (147,742)
Balance at Dec. 31, 2013 | $ 746,767 | $ 1,354,696 | $ (295) | $ (607,634)
Balance (in shares) at Dec. 31, 2013 |  | 297,159,000 |  |

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