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Property, Plant and Equipment, Net (Tables)
 9 Months Ended
Sep. 30, 2017
Property, Plant and Equipment, Net  
Schedule of components of property, plant and equipment

 

 

 

 

 

 

 

 

 

 

September 30,

 

December 31,

 

 

    

2017

    

2016

 

 

 

(in thousands)

 

Mineral properties

 

$

9,352

 

$

9,352

 

Exploration properties

 

 

2,518

 

 

2,518

 

Royalty properties

 

 

200

 

 

200

 

Buildings

 

 

4,221

 

 

4,386

 

Mining equipment and machinery

 

 

15,996

 

 

16,351

 

Other furniture and equipment

 

 

957

 

 

952

 

Asset retirement cost

 

 

865

 

 

992

 

 

 

 

34,109

 

 

34,751

 

Less: Accumulated depreciation and amortization

 

 

(25,540)

 

 

(25,516)

 

 

 

$

8,569

 

$

9,235