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PLANT AND EQUIPMENT AND MINERAL PROPERTIES (Tables)
 12 Months Ended
Dec. 31, 2018
Property, Plant and Equipment [Abstract]  
Schedule of Property, Plant and Equipment
Where straight-line depreciation is utilized, the range of useful lives for various asset classes is generally as follows:
•
Buildings
15 years
•
Shop tools and equipment
3-5 years
•
Mining equipment
5 years
•
Office equipment
4-5 years
•
Furniture and fixtures
5-7 years
•
Light trucks & utility vehicles
5 years
The following is a summary of plant and equipment:
 
December 31, 2018
 
December 31, 2017
 
Cost
 
Accumulated
Depreciation
 
Net Book Value
 
Cost
 
Accumulated
Depreciation
 
Net Book
Value
Plant and equipment
 
 
 
 
 
 
 
 
 
 
 
Nichols Ranch
$
29,210

 
$
(12,021
)
 
$
17,189

 
$
29,210

 
$
(9,971
)
 
$
19,239

Alta Mesa
13,656

 
(2,319
)
 
11,337

 
13,626

 
(1,388
)
 
12,238

Equipment and other
13,444

 
(12,127
)
 
1,317

 
13,367

 
(11,768
)
 
1,599

Plant and equipment total
$
56,310

 
$
(26,467
)
 
$
29,843

 
$
56,203

 
$
(23,127
)
 
$
33,076
Schedule of Summary of Mineral Properties
The following is a summary of mineral properties:
 
December 31, 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 (a)
1,287

 
1,287

Mineral properties total
$
83,539

 
$
83,539

a)
In the year ended December 31, 2018 the Company renewed all mineral leases and therefore did not record abandonment expense in the statement of operations. In the year ended December 31, 2017 the Company did not renew certain mineral leases and recorded abandonment expense of $0.29 million (December 31, 2016 – $1.04 million) in the statement of operations.