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Reclamation (Tables) | 3 Months Ended
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Mar. 31, 2017
Asset Retirement Obligation Disclosure [Abstract] |
Asset Retirement Obligation | Changes to the Company’s asset retirement obligations for operating sites are as follows:
| Three months ended March 31,
In thousands | 2017 |  | 2016
Asset retirement obligation - Beginning | $ | 97,380 |  |  | $ | 82,072 |
Accretion | 2,338 |  |  | 1,960 |
Additions and changes in estimates | — |  |  | 251 |
Settlements | (478 | ) |  | (309 | )
Asset retirement obligation - Ending | $ | 99,240 |  |  | $ | 83,974 |

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