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EXPLORATION AND EVALUATION ASSETS (Narrative) (Details) - Casino Project [Member] | 12 Months Ended
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Dec. 31, 2017
Statement [Line Items] |
Exploration and evaluation asset, ownership percentage | 100.00%
Net smelter returns royalty | 2.75%
Description of nature of obligation, contingent liabilities | As part of a separate agreement, Western is required to make a payment of $1 million upon making a production decision on the Casino Project.

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