Inventory and Ore on Leach Pads - Narrative (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		7 Months Ended	9 Months Ended
	Jan. 31, 2020	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2020	Sep. 30, 2019
Inventory [Line Items]
Inventory Write-down		$ 1,232	$ 13,966		$ 16,821	$ 41,285
Silvertip [Member]
Inventory [Line Items]
Inventory Write-down	$ 10,400			$ 3,300