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Asset Retirement Obligation (Tables)
3 Months Ended
Mar. 31, 2020
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, 2019$6,142  
Accretion expense75  
Balance at March 31, 2020$6,217