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Share capital - Share Repurchase and Secondary Offering (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 CAD ($)
Disclosure of classes of share capital [line items] |
Amount of Common shares acquired and cancelled through share repurchase | $ 174,639
Share repurchase and secondary offering [Member] |
Disclosure of classes of share capital [line items] |
Amount of Common shares acquired and cancelled through share repurchase | 174,600
Victoria Gold Corp. (associate) [Member] |
Disclosure of classes of share capital [line items] |
Amount of Common shares acquired and cancelled through share repurchase | 71,400
Dalradian Resources Inc. (other investment) [Member] |
Disclosure of classes of share capital [line items] |
Amount of Common shares acquired and cancelled through share repurchase | 58,100
Aquila Resources Inc. (associate) [Member] |
Disclosure of classes of share capital [line items] |
Amount of Common shares acquired and cancelled through share repurchase | 9,700
Highland Copper Company Inc. (associate) [Member] |
Disclosure of classes of share capital [line items] |
Amount of Common shares acquired and cancelled through share repurchase | 3,000
Other investments [Member] |
Disclosure of classes of share capital [line items] |
Amount of Common shares acquired and cancelled through share repurchase | $ 32,400

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