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Assets Held For Sale (Tables)
3 Months Ended
Mar. 31, 2022
Asset Retirement Obligation Disclosure [Abstract]  
Disclosure of long lived assets held-for-sale The following table summarizes the Company's Assets held for sale by asset class as of March 31, 2022 and December 31, 2021 (dollars in thousands):
March 31,
2022
December 31,
2021
Equipment not in use$9,913 $11,163 
Mine equipment125 125 
Materials and supplies270 270 
Total$10,308 $11,558