Long-Term Reclamation Liability and Retirement Obligation Asset
 6 Months Ended
Jun. 30, 2015
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:

 
June 30, 2015
 
December 31, 2014
Long-term reclamation liability — beginning of period
$
5,908,700

 
$
5,424,410

Additional obligations incurred
659,295

 
140,573

Accretion of reclamation liability
130,653

 
343,717

Long-term reclamation liability — end of period
$
6,698,648

 
$
5,908,700


 
Following is a reconciliation of the aggregate retirement obligation asset associated with our reclamation plan for our mining projects:
 
 
June 30, 2015
 
December 31, 2014
Retirement obligation asset — beginning of period
$
1,619,101

 
$
2,491,956

Additional obligations incurred
659,295

 
140,573

Amortization of retirement obligation asset
(576,481
)
 
(1,013,428
)
Retirement obligation asset — end of period
$
1,701,915

 
$
1,619,101