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Long-term Reclamation Liability and Retirement Obligation Asset (Tables)
12 Months Ended
Dec. 31, 2018
Asset Retirement Obligation Disclosure [Abstract]  
Schedule of Other Noncurrent Liabilities
Following is a reconciliation of the aggregate retirement liability associated with our reclamation plan for the mining projects for the years ended December 31, 2018, 2017 and 2016:
 
 
2018
 
2017
 
2016
Long-term reclamation liability — beginning of period
$
7,417,680

 
$
7,353,346

 
$
6,827,568

Additional obligations incurred

 

 
340,000

Accretion of reclamation liability
23,411

 
64,334

 
185,778

Long-term reclamation liability — end of period
$
7,441,091

 
$
7,417,680

 
$
7,353,346

Schedule of Asset Retirement Obligations
Following is a reconciliation of the aggregate retirement obligation asset associated with our mining projects for the years ended December 31, 2018, 2017 and 2016:
 
 
2018
 
2017
 
2016
Retirement obligation asset — beginning of period
$
282,745

 
$
617,126

 
$
1,107,120

Additional obligations incurred

 

 
340,000

Amortization of retirement obligation asset
(79,471
)
 
(334,381
)
 
(829,994
)
Retirement obligation asset — end of period
$
203,274

 
$
282,745

 
$
617,126