XML 88 R66.htm IDEA: XBRL DOCUMENT v3.20.4
INVENTORY (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Process material stockpiles $ 373 $ 1,079
Concentrate inventory 64 3,055
Materials and supplies 1,222 1,458
Inventories $ 1,659 $ 5,592