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PLANT, PIPELINE AND EQUIPMENT (Tables)
3 Months Ended
Mar. 31, 2017
PLANT, PIPELINE AND EQUIPMENT [Abstract]  
Plant, Pipeline and Equipment
Plant, pipeline and equipment consisted of the following:

  
March 31, 2017
  
December 31, 2016
 
  
(thousands of dollars)
 
Platinum catalyst metal
 
$
1,612
  
$
1,612
 
Land
  
5,376
   
5,376
 
Plant, pipeline and equipment
  
156,142
   
154,107
 
Construction in progress
  
45,093
   
33,391
 
Total plant, pipeline and equipment
  
208,223
   
194,486
 
  Less accumulated depreciation
  
(56,617
)
  
(54,477
)
Net plant, pipeline and equipment
 
$
151,606
  
$
140,009