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PLANT AND EQUIPMENT AND MINERAL PROPERTIES (Tables)
 9 Months Ended
Sep. 30, 2017
Property, Plant and Equipment [Abstract]  
Schedule of Property, Plant and Equipment
The following is a summary of plant and equipment:
 
September 30, 2017
 
December 31, 2016
 
Cost
 
Accumulated
Depreciation
 
Net Book Value
 
Cost
 
Accumulated
Depreciation
 
Net Book
Value
Plant and equipment
 
 
 
 
 
 
 
 
 
 
 
Nichols Ranch
$
29,210

 
$
(9,458
)
 
$
19,752

 
$
29,210

 
$
(6,804
)
 
$
22,406

Alta Mesa
13,626

 
(1,156
)
 
12,470

 
13,626

 
(456
)
 
13,170

Equipment and other
13,367

 
(11,671
)
 
1,696

 
13,367

 
(11,361
)
 
2,006

Plant and equipment total
$
56,203

 
$
(22,285
)
 
$
33,918

 
$
56,203

 
$
(18,621
)
 
$
37,582
Schedule of Summary of Mineral Properties
The following is a summary of mineral properties:
 
September 30, 2017
 
December 31, 2016
Mineral properties
 
 
 
In-situ recovery ("ISR")
 
 
 
Uranerz ISR properties (a,b)
$
25,974

 
$
35,060

In-situ recovery total
25,974

 
35,060

Conventional
 
 
 
Sheep Mountain
34,183

 
34,183

Roca Honda
22,095

 
22,095

Other
1,287

 
1,287

Conventional total
57,565

 
57,565

Mineral properties total
$
83,539

 
$
92,625

a)
In the three months ended June 30, 2017, the Company identified a buyer for a property in the ISR segment, and a definitive agreement was signed on November 1, 2017. The sale of the property is expected to be completed in the last quarter of 2017 or the first quarter of 2018. The Company reclassified the property as mineral properties held for sale, evaluated its fair value, less costs to sell and recorded an impairment charge of $0.20 million and $3.80 million for the three and nine months ended September 30, 2017, respectively, in the statement of operations (September 30, 2016 - Nil).
b)
In the three months and nine months ended September 30, 2017, the Company did not renew certain mineral leases and recorded abandonment expense of $Nil and $0.29 million, respectively, in the statement of operations (three and nine months ended September 30, 2016 - $1.01 million and $1.04 million, respectively).