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Retirement Obligation Asset (Tables)
6 Months Ended
Jun. 30, 2020
Asset Retirement Obligation Disclosure [Abstract]  
Reconciliation of the Aggregate Retirement Obligation Asset

Following is a reconciliation of the aggregate retirement obligation asset associated with our mining reclamation plans: 
 
Six Months Ended
 
Twelve Months
Ended
 
June 30, 2020
 
December 31, 2019
Retirement obligation asset — beginning of period
$
115,926

 
$
203,274

Additional obligations incurred

 

Amounts reclassified to assets held for sale

 
(19,590
)
Amortization of retirement obligation asset
(28,981
)
 
(67,758
)
Retirement obligation asset — end of period
$
86,945

 
$
115,926