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Property, Plant and Equipment, Net (Tables)
 9 Months Ended
Sep. 30, 2018
Property, Plant and Equipment, Net  
Schedule of components of property, plant and equipment

 

 

 

 

 

 

 

 

 

 

September 30,

 

December 31,

 

 

    

2018

    

2017

 

 

 

(in thousands)

 

Mineral properties

 

$

9,353

 

$

9,352

 

Exploration properties

 

 

2,518

 

 

2,518

 

Royalty properties

 

 

200

 

 

200

 

Buildings

 

 

4,273

 

 

4,246

 

Mining equipment and machinery

 

 

15,961

 

 

15,989

 

Other furniture and equipment

 

 

866

 

 

958

 

Asset retirement cost

 

 

866

 

 

865

 

 

 

 

34,037

 

 

34,128

 

Less: Accumulated depreciation and amortization

 

 

(26,742)

 

 

(25,988)

 

 

 

$

7,295

 

$

8,140