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PLANT AND EQUIPMENT AND MINERAL PROPERTIES (Tables) | 12 Months Ended
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Dec. 31, 2017
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, 2017 |  | December 31, 2016
| Cost |  | Accumulated Depreciation |  | Net Book Value |  | Cost |  | Accumulated Depreciation |  | Net Book Value
Plant and equipment |  |  |  |  |  |  |  |  |  |  |
Nichols Ranch | $ | 29,210 |  |  | $ | (9,971 | ) |  | $ | 19,239 |  |  | $ | 29,210 |  |  | $ | (6,804 | ) |  | $ | 22,406 |
Alta Mesa | 13,626 |  |  | (1,388 | ) |  | 12,238 |  |  | 13,626 |  |  | (456 | ) |  | 13,170 |
Equipment and other | 13,367 |  |  | (11,768 | ) |  | 1,599 |  |  | 13,367 |  |  | (11,361 | ) |  | 2,006 |
Plant and equipment total | $ | 56,203 |  |  | $ | (23,127 | ) |  | $ | 33,076 |  |  | $ | 56,203 |  |  | $ | (18,621 | ) |  | $ | 37,582 |
Schedule of Summary of Mineral Properties | The following is a summary of mineral properties:
| December 31, 2017 |  | December 31, 2016
Mineral properties |  |  |
Uranerz ISR properties (a) | $ | 25,974 |  |  | $ | 35,060 |
Sheep Mountain | 34,183 |  |  | 34,183 |
Roca Honda (b) | 22,095 |  |  | 22,095 |
Other (a) | 1,287 |  |  | 1,287 |
Mineral properties total | $ | 83,539 |  |  | $ | 92,625 |
a) | 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, December 31, 2015 – $2.77 million) in the statement of operations.
b) | On May 27, 2016, the Company issued 1,212,173 shares to acquire the remaining 40% interest of the Roca Honda project for consideration of $2.63 million and an additional $4.5 million in cash payable upon first commencement of commercial mineral extraction. The acquisition was accounted for as a purchase of assets as Roca Honda does not meet the definition of a business under FASB ASC Topic 805, Business Combinations because Roca Honda does not currently have the resources, both inputs and processes, to apply to the Roca Honda property in order to extract uranium.

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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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