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Property, Plant and Equipment
9 Months Ended
Sep. 30, 2017
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment

5. PROPERTY, PLANT AND EQUIPMENT

   Net Book Value of Property, Plant and Equipment at September 30, 2017 
(thousands of dollars)  Turkey   Texas   New Mexico   Corporate   Total 
Uranium plant  $-   $8,447   $-   $-   $8,447 
Mineral rights and properties   17,968    -    19,102    -    37,071 
Other property, plant and equipment   20    1,132    -    214    1,366 
     Total  $17,988   $9,579   $19,102   $214   $46,883 
                          
    Net Book Value of Property, Plant and Equipment at December 31, 2016 
(thousands of dollars)   Turkey    Texas    New Mexico    Corporate    Total 
Uranium plant  $-   $8,459   $-   $-   $8,459 
Mineral rights and properties   17,968    -    19,102    -    37,070 
Other property, plant and equipment   22    1,224    -    141    1,387 
     Total  $17,990   $9,683   $19,102   $141   $46,916