XML 48 R31.htm IDEA: XBRL DOCUMENT v3.20.2
Asset Retirement Obligation (Tables)
9 Months Ended
Sep. 30, 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 
Additions8,424 
Accretion expense239 
Balance at September 30, 2020$14,805