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Reclamation and Mine Closure (Tables) | 12 Months Ended
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Dec. 31, 2013
Asset Retirement Obligation Disclosure [Abstract] |
Asset Retirement Obligation | Changes to the Company’s asset retirement obligations are as follows (in thousands):
| Years ended December 31,
| 2013 |  | 2012
Asset retirement obligation - Beginning | $ | 34,457 |  |  | $ | 32,714 |
Accretion | 3,442 |  |  | 2,911 |
Additions and changes in estimates | 20,236 |  |  | (1,073 | )
Settlements | (681 | ) |  | (95 | )
Asset retirement obligation - Ending | $ | 57,454 |  |  | $ | 34,457 |

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