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Inventories (Tables)
12 Months Ended
Dec. 31, 2019
Classes of current inventories [abstract]  
Summary of Inventories
 
December 31, 2019

 
December 31, 2018

 
 
 
 
Ore stockpiles
$
3,859

 
$
1,620

In-process inventory and finished goods
81,282

 
59,974

Materials and supplies
78,093

 
76,291

 
$
163,234

 
$
137,885