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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 | 1,222 | 1,222 |  |
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 | 325 | 325 |  |
Shares issued for Mexico mining concessions (in shares) |  | 42,000 |  |
Unrealized loss on marketable equity securities | (866) |  | (866) |
Net loss | (21,888) |  |  | (21,888)
Balance at Jun. 30, 2011 | 258,261 | 612,124 | (609) | (353,254)
Balance (in shares) at Jun. 30, 2011 |  | 139,711,000 |  |
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 | 2,135 | 2,135 |  |
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 | 594 | 594 |  |
Exercise of stock options (in shares) | 1,200,000 | 317,000 |  |
Exercise of stock options from 2007 acquisition and Minera Andes Inc. | 2,710 | 2,710 |  |
Exercise of stock options from 2007 acquisition and Minera Andes Inc. (in shares) |  | 852,000 |  |
Shares issued for Mexico mining concessions | 227 | 227 |  |
Shares issued for Mexico mining concessions (in shares) | 41,500 | 42,000 |  |
Realized loss on marketable equity securities | (994) |  | (994) |
Other-than-temporary impairment on marketable equity securities | 1,993 |  | 1,993 |
Net loss | (40,453) |  |  | (40,453)
Balance at Jun. 30, 2012 | $ 853,362 | $ 1,287,343 | $ (290) | $ (433,691)
Balance (in shares) at Jun. 30, 2012 |  | 268,295,000 |  |

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