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Inventories (Tables)
 12 Months Ended
Dec. 31, 2017
Disclosure Of Inventories [Abstract]  
Summary of Inventories

 

Years ended December 31,

 

 

 

 

2017

 

 

2016

 

Ore in process

 

$

 

16,764

 

$

 

6,347

 

Finished metal inventory

 

 

 

383

 

 

 

-

 

Supplies

 

 

 

4,837

 

 

 

3,988

 

 

 

$

 

21,984

 

$

 

10,335