Fair Value Accounting (Tables)

12 Months Ended

Dec. 31, 2018

Fair Value Accounting

Schedule of assets measured at fair value

	Fair value at December 31, 2018
	Total		Level 1		Level 3
Marketable securities	$	—	$	—	$	—
Other investments (Midas Gold Shares)		5,462		5,462		—
Used mill equipment (non-recurring)		5,500		—		5,500

	Fair value at December 31, 2017
	Total		Level 1		Level 3
Marketable securities	$	90	$	90	$	—
Other investments (Midas Gold Shares)		3,746		3,746		—
Used mill equipment (non-recurring)		6,500		—		6,500