Inventories (Tables)

3 Months Ended

Mar. 31, 2019

Inventory, Net [Abstract]

Schedule of Inventory, Current [Table Text Block]

Inventories of the Company are comprised of:

	March 31, 2019		December 31, 2018
Stockpile inventory	$	10,353	$	6,913
In-process inventory		24,149		21,607
Dore inventory		892		761
Supplies and spare parts		2,869		2,663
	$	38,263	$	31,944
Current portion	$	32,984	$	25,031
Non-current portion	$	5,279	$	6,913