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Long-Term Reclamation Liability and Retirement Obligation Asset
3 Months Ended
Mar. 31, 2018
Asset Retirement Obligation Disclosure [Abstract]  
Long-Term Reclamation Liability and Retirement Obligation Asset
Long-Term Reclamation Liability and Retirement Obligation Asset
 
Following is a reconciliation of the aggregate reclamation liability associated with our reclamation plan for our mining projects:

 
Three Months Ended
 
Twelve Months
 Ended
 
March 31, 2018
 
December 31, 2017
Long-term reclamation liability — beginning of period
$
7,417,680

 
$
7,353,346

Additional obligations incurred

 

Accretion of reclamation liability
4,876

 
64,334

Long-term reclamation liability — end of period
$
7,422,556

 
$
7,417,680


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

 
$
617,126

Additional obligations incurred

 

Amortization of retirement obligation asset
(14,917
)
 
(334,381
)
Retirement obligation asset — end of period
$
267,828

 
$
282,745