Asset Retirement Obligation and Financial Reclamation Assurance (Tables)

9 Months Ended

Sep. 30, 2017

Asset Retirement Obligation Disclosure [Abstract]

Schedule of Change in Asset Retirement Obligation [Table Text Block]

The following is a summary of asset retirement obligations:

	September 30, 2017		December 31, 2016
Balance, beginning of the period	$	1,366	$	978
Accretion		92		90
Changes in cash flow estimates		261		298
Balance, end of the period	$	1,719	$	1,366