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Asset Retirement Obligation (Tables)
3 Months Ended
Mar. 31, 2021
Asset Retirement Obligation Disclosure [Abstract]  
Reconciliation of total reclamation liability for asset retirement obligations The following is a reconciliation of the total reclamation liability for asset retirement obligations.
Balance at December 31, 2020$14,996 
Additions737 
Accretion expense192 
Balance at March 31, 2021$15,925