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Investments in Associate (Narrative) (Details) - Medgold [member] $ in Thousands, shares in Millions |  | 12 Months Ended
--- | --- | ---
Feb. 07, 2017 shares | Dec. 31, 2017 USD ($)
Disclosure of associates [line items] |  |
Name of associate |  | Medgold Resourced Corporation
Number of common share purchased in associate | shares | 10 |
Proportion of ownership interest in associate | 24.00% | 22.00%
Fair value of investment | $ |  | $ 3,200

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