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Reclamation (Tables) | 12 Months Ended
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Dec. 31, 2019
Asset Retirement Obligation Disclosure [Abstract] |
Asset Retirement Obligation | Changes to the Company’s asset retirement obligations for its operating sites are as follows:
| Year ended December 31,
In thousands | 2019 |  | 2018
Asset retirement obligation - Beginning | $ | 133,508 |  |  | $ | 118,799 |
Accretion | 11,968 |  |  | 11,037 |
Additions and changes in estimates | (7,538 | ) |  | 6,880 |
Settlements | (3,540 | ) |  | (3,208 | )
Asset retirement obligation - Ending | $ | 134,398 |  |  | $ | 133,508 |

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