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PLANT AND EQUIPMENT AND MINERAL PROPERTIES (Tables) | 6 Months Ended
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Jun. 30, 2017
Property, Plant and Equipment [Abstract] |
Schedule of Property, Plant and Equipment | The following is a summary of plant and equipment:
| June 30, 2017 |  | December 31, 2016
| Cost |  | Accumulated Depreciation |  | Net Book Value |  | Cost |  | Accumulated Depreciation |  | Net Book Value
Plant and equipment |  |  |  |  |  |  |  |  |  |  |
Nichols Ranch | $ | 29,210 |  |  | $ | (8,946 | ) |  | $ | 20,264 |  |  | $ | 29,210 |  |  | $ | (6,804 | ) |  | $ | 22,406 |
Alta Mesa | 13,626 |  |  | (923 | ) |  | 12,703 |  |  | 13,626 |  |  | (456 | ) |  | 13,170 |
Equipment and other | 13,367 |  |  | (11,572 | ) |  | 1,795 |  |  | 13,367 |  |  | (11,361 | ) |  | 2,006 |
Plant and equipment total | $ | 56,203 |  |  | $ | (21,441 | ) |  | $ | 34,762 |  |  | $ | 56,203 |  |  | $ | (18,621 | ) |  | $ | 37,582 |
Schedule of Summary of Mineral Properties | The following is a summary of mineral properties:
| June 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 has identified a buyer for a property in the ISR segment. The sale of the property is expected to be completed in the 2nd half of 2017. The Company reclassified the property as mineral properties held for sale, evaluated its fair value and recorded an impairment charge of $3.60 million (June 30, 2016 - Nil).
b) | In the three months 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 (June 30, 2016 - $Nil).

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- Definition Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(13)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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