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PLANT AND EQUIPMENT AND MINERAL PROPERTIES | 6 Months Ended
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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.

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- Definition The entire disclosure for long-lived, physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, accounting policies and methodology, roll forwards, depreciation, depletion and amortization expense, including composite depreciation, accumulated depreciation, depletion and amortization expense, useful lives and method used, income statement disclosures, assets held for sale and public utility disclosures. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 + Details
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