10. Inventories



	December 31, 2018		December 31, 2017

Ore stockpiles	$	1,620	$	3,297
In-process inventory and finished goods	59,974		96,651
Materials and supplies	76,291		68,896
	$	137,885	$	168,844

The cost of materials and supplies consumed during the year and included in production costs amounted to $87,269 (2017 – $120,422).

Inventory write downs related to zinc inventory of $269 (2017 – $444) and to pyrite inventory of $1,196 (2017 – $nil) were recognized during the year. As at December 31, 2018, all inventories are held at cost.