Retirement Obligation Asset

3 Months Ended

Mar. 31, 2019

Asset Retirement Obligation Disclosure [Abstract]

Retirement Obligation Asset

Retirement Obligation Asset

Following is a reconciliation of the aggregate retirement obligation asset associated with our mining reclamation plans: 

	Three Months Ended			Twelve Months Ended
	March 31, 2019			December 31, 2018
Retirement obligation asset — beginning of period	$	203,274		$	282,745
Additional obligations incurred	—			—
Amortization of retirement obligation asset	(16,939		)	(79,471		)
Retirement obligation asset — end of period	$	186,335		$	203,274

Long-Term Reclamation Liability

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, 2019		December 31, 2018
Long-term reclamation liability — beginning of period	$	7,441,091	$	7,417,680
Additional obligations incurred	—		—
Accretion of reclamation liability	5,710		23,411
Long-term reclamation liability — end of period	$	7,446,801	$	7,441,091