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Retirement Obligation Asset
9 Months Ended
Sep. 30, 2018
Asset Retirement Obligation Disclosure [Abstract]  
Retirement Obligation Asset
Retirement Obligation Asset

Following is a reconciliation of the aggregate retirement obligation asset associated with our reclamation plan for our mining projects: 
 
Nine Months Ended
 
Twelve Months
Ended
 
September 30, 2018
 
December 31, 2017
Retirement obligation asset — beginning of period
$
282,745

 
$
617,126

Additional obligations incurred

 

Amortization of retirement obligation asset
(57,953
)
 
(334,381
)
Retirement obligation asset — end of period
$
224,792

 
$
282,745

Long-Term Reclamation Liability

Following is a reconciliation of the aggregate reclamation liability associated with our reclamation plan for our mining projects:
 
Nine Months Ended
 
Twelve Months
 Ended
 
September 30, 2018
 
December 31, 2017
Long-term reclamation liability — beginning of period
$
7,417,680

 
$
7,353,346

Additional obligations incurred

 

Accretion of reclamation liability
17,233

 
64,334

Long-term reclamation liability — end of period
$
7,434,913

 
$
7,417,680