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Reclamation (Tables) | 12 Months Ended
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Dec. 31, 2015
Asset Retirement Obligation Disclosure [Abstract] |
Asset Retirement Obligation |
| Year ended December 31,
In thousands | 2015 |  | 2014
Asset retirement obligation - Beginning | $ | 67,214 |  |  | $ | 55,966 |
Accretion | 7,738 |  |  | 4,826 |
Additions and changes in estimates | 11,939 |  |  | 6,748 |
Settlements | (4,819 | ) |  | (326 | )
Asset retirement obligation - Ending | $ | 82,072 |  |  | $ | 67,214 |

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