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Reclamation (Tables) | 3 Months Ended
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Mar. 31, 2014
Asset Retirement Obligation Disclosure [Abstract] |
Asset Retirement Obligation | Changes to the Company’s asset retirement obligations are as follows (in thousands):
| March 31, 2014 |  | December 31, 2013
Asset retirement obligation - Beginning | $ | 57,454 |  |  | $ | 34,457 |
Accretion | 1,317 |  |  | 3,442 |
Additions and changes in estimates | — |  |  | 20,236 |
Settlements | (311 | ) |  | (681 | )
Asset retirement obligation - Ending | $ | 58,460 |  |  | $ | 57,454 |

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