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Retirement Obligation Asset (Tables)
6 Months Ended
Jun. 30, 2018
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 reclamation plan for our mining projects:
 
 
Six Months Ended
 
Twelve Months
Ended
 
June 30, 2018
 
December 31, 2017
Retirement obligation asset — beginning of period
$
282,745

 
$
617,126

Additional obligations incurred

 

Amortization of retirement obligation asset
(36,435
)
 
(334,381
)
Retirement obligation asset — end of period
$
246,310

 
$
282,745