XML 83 R46.htm IDEA: XBRL DOCUMENT v3.19.1
Inventories (Tables)
12 Months Ended
Dec. 31, 2018
Classes of current inventories [abstract]  
Summary of 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