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PLANT AND EQUIPMENT AND MINERAL PROPERTIES
 6 Months Ended
Jun. 30, 2018
Property, Plant and Equipment [Abstract]  
Plant and Equipment and Mineral Properties
PLANT AND EQUIPMENT AND MINERAL PROPERTIES
The following is a summary of plant and equipment:
 
June 30, 2018
 
December 31, 2017
 
Cost
 
Accumulated
Depreciation
 
Net Book Value
 
Cost
 
Accumulated
Depreciation
 
Net Book
Value
Plant and equipment
 
 
 
 
 
 
 
 
 
 
 
Nichols Ranch
$
29,210

 
$
(10,996
)
 
$
18,214

 
$
29,210

 
$
(9,971
)
 
$
19,239

Alta Mesa
13,626

 
(1,854
)
 
11,772

 
13,626

 
(1,388
)
 
12,238

Equipment and other
13,381

 
(11,951
)
 
1,430

 
13,367

 
(11,768
)
 
1,599

Plant and equipment total
$
56,217

 
$
(24,801
)
 
$
31,416

 
$
56,203

 
$
(23,127
)
 
$
33,076


The following is a summary of mineral properties:
 
June 30, 2018
 
December 31, 2017
Mineral properties
 
 
 
Uranerz ISR properties (a)
$
25,974

 
$
25,974

Sheep Mountain
34,183

 
34,183

Roca Honda
22,095

 
22,095

Other
1,287

 
1,287

Mineral properties total
$
83,539

 
$
83,539

a)     In the three and six months ended June 30, 2017, the Company did not renew certain mineral leases and recorded abandonment expense of $0.04 million and $0.29 million, respectively, in the statement of operations.