Reclamation (Tables)

12 Months Ended

Dec. 31, 2021

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	2021		2020
Asset retirement obligation - Beginning	$	137,120	$	134,398
Accretion	11,815		11,574
Additions and changes in estimates	34,016		(6,132)
Settlements	(3,845)		(2,720)
Asset retirement obligation - Ending	$	179,106	$	137,120