IMPAIRMENTS	12 Months Ended
Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Impairments	IMPAIRMENTS Impairment of goodwill In the year ended December 31, 2015, the Company recorded goodwill of $47.73 million associated with the acquisition of Uranerz on June 18, 2015. The goodwill represents the excess of the acquisition date fair value of the purchase consideration, over the fair value of the assets acquired, net of obligations assumed, and is ascribed to the ISR reporting unit. In the period following the acquisition of Uranerz to December 31, 2015, uranium spot market prices had fallen approximately 20% and the value of the Company’s shares and related market capitalization had decreased significantly. As a result, during the Company’s annual impairment test for goodwill performed as of December 31, 2015 the Company evaluated the carrying amount of the goodwill and determined that the goodwill should be fully impaired at December 31, 2015 (refer to note 21 for disclosure of the Company’s valuation methodology). Impairment of plant and equipment, mineral properties and mineral properties held for sale The Company conducts a review of potential triggering events for all its mineral properties on a quarterly basis. When events or changes in circumstances indicate that the related carrying amounts may not be recoverable, the Company carries out a review and evaluation of its long-lived assets in accordance with its accounting policy. No such events or changes in circumstances were noted in the year ended December 31, 2017. In the year ended December 31, 2017 the Company entered into an agreement to sell certain non-core uranium properties. The Company reclassifed these properties as held for sale and recorded an impairment of $3.80 million. The impaired properties are in the Reno Creek area. The impairment was based of the estimate of its fair value determined using the market approach less estimated selling costs. In the year ended December 31, 2015, the Company identified indicators of impairment of its mineral properties due to the decline in the uranium concentrate spot and long-term prices and deterioration in the Company’s expectation of future uranium concentrate prices with respect to the Company's mineral properties. An impairment analysis was performed for these properties using the assumptions listed in note 21. The Company compared the undiscounted cash flows for the mineral properties tested with their carrying amounts. No impairment was considered necessary with respect of Roca Honda, Sheep Mountain properties and the ISR mineral properties, since the undiscounted cash flows exceeded the carrying amounts for the properties. With respect of mineral properties identified as held for sale the Company recorded an impairment totaling $8.22 million. The impaired properties included Copper King, Marquez Ranch, Gas Hills, Juniper Ridge and the Nose Rock. These properties are classified in the other category of the conventional segment. The impairment was based of the estimate of its fair value determined using the market approach less estimated selling costs. In 2016, the Copper King, Marquez Ranch and Nose Rock mineral interests with a carrying amount of $1.30 million were sold in separate transactions for gross proceeds totaling $1.36 million.

IMPAIRMENTS

Impairment of goodwill

In the year ended December 31, 2015, the Company recorded goodwill of $47.73 million associated with the acquisition of Uranerz on June 18, 2015. The goodwill represents the excess of the acquisition date fair value of the purchase consideration, over the fair value of the assets acquired, net of obligations assumed, and is ascribed to the ISR reporting unit.

In the period following the acquisition of Uranerz to December 31, 2015, uranium spot market prices had fallen approximately 20% and the value of the Company’s shares and related market capitalization had decreased significantly. As a result, during the Company’s annual impairment test for goodwill performed as of December 31, 2015 the Company evaluated the carrying amount of the goodwill and determined that the goodwill should be fully impaired at December 31, 2015 (refer to note 21 for disclosure of the Company’s valuation methodology).

Impairment of plant and equipment, mineral properties and mineral properties held for sale

The Company conducts a review of potential triggering events for all its mineral properties on a quarterly basis. When events or changes in circumstances indicate that the related carrying amounts may not be recoverable, the Company carries out a review and evaluation of its long-lived assets in accordance with its accounting policy. No such events or changes in circumstances were noted in the year ended December 31, 2017.

In the year ended December 31, 2017 the Company entered into an agreement to sell certain non-core uranium properties. The Company reclassifed these properties as held for sale and recorded an impairment of $3.80 million. The impaired properties are in the Reno Creek area. The impairment was based of the estimate of its fair value determined using the market approach less estimated selling costs.

In the year ended December 31, 2015, the Company identified indicators of impairment of its mineral properties due to the decline in the uranium concentrate spot and long-term prices and deterioration in the Company’s expectation of future uranium concentrate prices with respect to the Company's mineral properties. An impairment analysis was performed for these properties using the assumptions listed in note 21. The Company compared the undiscounted cash flows for the mineral properties tested with their carrying amounts. No impairment was considered necessary with respect of Roca Honda, Sheep Mountain properties and the ISR mineral properties, since the undiscounted cash flows exceeded the carrying amounts for the properties. With respect of mineral properties identified as held for sale the Company recorded an impairment totaling $8.22 million. The impaired properties included Copper King, Marquez Ranch, Gas Hills, Juniper Ridge and the Nose Rock. These properties are classified in the other category of the conventional segment. The impairment was based of the estimate of its fair value determined using the market approach less estimated selling costs. In 2016, the Copper King, Marquez Ranch and Nose Rock mineral interests with a carrying amount of $1.30 million were sold in separate transactions for gross proceeds totaling $1.36 million.