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Geographic and Segment Information (Tables)
 3 Months Ended 12 Months Ended
Mar. 31, 2019
Dec. 31, 2018
GEOGRAPHIC AND SEGMENT INFORMATION    
Schedule of Segment Reporting Information

        The table below provides a breakdown of the long-term assets by reportable segments as of March 31, 2019 and December 31, 2018:

 
   March 31, 2019  
(thousands of dollars)
  Corporate   Uranium   Lithium   Graphite   Total  

Net property, plant and equipment

   $ 150   $ 11,407   $ —   $ 8,972   $ 20,529  

Restricted cash

     —     3,740     —     10     3,750  

Operating lease right of use assets, non-current

     543     26     —     —     569  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total long-term assets

   $ 693   $ 15,173   $ —   $ 8,982   $ 24,848  
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   December 31, 2018  
(thousands of dollars)
  Corporate   Uranium   Lithium   Graphite   Total  

Net property, plant and equipment

   $ 162   $ 11,418   $ —   $ 8,973   $ 20,553  

Restricted cash

     —     3,722     —     10     3,732  

Notes receivable, non-current

     —     1,493     —     —     1,493  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total long-term assets

   $ 162   $ 16,633   $ —   $ 8,983   $ 25,778  
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        The table below provides a breakdown of the reportable segments for the three months ended March 31, 2019 and March 31, 2018. Non-mining activities and other administrative operations are reported in the Corporate column.

 
   Three Months Ended
March 31, 2019		  
(thousands of dollars)
  Corporate   Uranium   Lithium   Graphite   Total  

Statement of Operations

                                

Mineral property expenses

   $ —   $ 553   $ 1   $ 80   $ 634  

General and administrative expenses

     1,279     392     —     147     1,818  

Sales and marketing expenses

     —     —     —     18     18  

Accretion of asset retirement costs

     —     126     —     —     126  

Depreciation and amortization

     1     22     —     —     23  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Loss from operations

     1,280     1,093     1     245     2,619  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Other (expense) income

     (555 )   —     —     —     (555 )
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Loss before taxes

   $ (1,835 ) $ (1,093 ) $ (1 ) $ (245 ) $ (3,174 )
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   Three Months Ended
March 31, 2018		  
(thousands of dollars)
  Corporate   Uranium   Lithium   Graphite   Total  

Statement of Operations

                                

Mineral property expenses

   $ —   $ 774   $ 8   $ —   $ 782  

General and administrative

     1,353     452     —     —     1,805  

Acquisition related expenses

     755     —     —     —     755  

Accretion of asset retirement costs

     —     134     —     —     134  

Depreciation and amortization

     1     33     —     —     34  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Loss from operations

     2,109     1,393     8     —     3,510  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Other income

     81     10     —     —     91  
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Loss before taxes

   $ (2,028 ) $ (1,383 ) $ (8 ) $ —   $ (3,419 )
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The table below provides a breakdown of the long-term assets by reportable segments as of December 31, 2018 and December 31, 2017:

 

   December 31, 2018 
(thousands of dollars)  Corporate   Uranium   Lithium   Graphite   Total 
                     
Net property, plant and equipment  $162   $11,418   $-   $8,973   $20,553 
Restricted cash   -    3,722    -    10    3,732 
Notes receivable, non-current   -    1,493    -    -    1,493 
Total long-term assets  $162   $16,633   $-   $8,983   $25,778 
                          

 

   December 31, 2017 
(thousands of dollars)  Corporate   Uranium   Lithium   Graphite   Total 
                     
Net property, plant and equipment  $211   $35,198   $-   $-   $35,409 
Restricted cash   -    3,668    -    -    3,668 
Notes receivable, non-current   834    2,494    -    -    3,328 
Total long-term assets  $1,045   $41,360   $-   $-   $42,405 
                          

 

The table below provides a breakdown of the reportable segments for the years ended December 31, 2018 and December 31, 2017. Non-mining activities and other administrative operations are reported in the Corporate column.

 

   Year Ended December 31, 2018 
(thousands of dollars)  Corporate   Uranium   Lithium   Graphite   Total 
Statement of Operations                    
Mineral property expenses  $-   $2,917   $481   $140   $3,538 
General and administrative   4,986    1,846    -    525    7,357 
Acquisition related expenses   333    -    -    -    333 
Accretion of asset retirement costs   -    993    -    -    993 
Depreciation and amortization   5    110    -    1    116 
Impairment of Uranium properties   -    23,712    -    -    23,712 
    5,324    29,578    481    666    36,049 
Loss from operations   (5,324)   (29,578)   (481)   (666)   (36,049)
Other income   196    168    -    1    365 
Loss before taxes  $(5,128)  $(29,410)  $(481)  $(665)  $(35,684)
                          

 

   Year Ended December 31, 2017 
(thousands of dollars)  Corporate   Uranium   Lithium   Graphite   Total 
Statement of Operations                    
Mineral property expenses  $-   $3,383   $1,201   $-   $4,584 
General and administrative   4,791    1,823    -    -    6,614 
Acquisition related expenses   1,003    -    -    -    1,003 
Accretion of asset retirement costs   -    1,039    -    -    1,039 
Depreciation and amortization   5    137    -    -    142 
Impairment of Uranium properties   -    11,436    -    -    11,436 
    5,799    17,818    1,201    -    24,818 
Loss from operations   (5,799)   (17,818)   (1,201)   -    (24,818)
Other income   573    4,957    -    -    5,530 
Loss before taxes  $(5,226)  $(12,861)  $(1,201)  $-   $(19,288)