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Income and other taxes - Schedule of Unrecognized Deferred Tax Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unrecognized deferred tax assets	$ 172,954	$ 135,905
Capital and non-capital tax losses
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unrecognized deferred tax assets	135,533	112,886
Current assets
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unrecognized deferred tax assets	253	111
Debt and share issue costs
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unrecognized deferred tax assets	361	864
Mine restoration provisions
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unrecognized deferred tax assets	14,816	11,470
Mining interests and other
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unrecognized deferred tax assets	21,991	2,769
Long term debt
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]
Unrecognized deferred tax assets	$ 0	$ 7,805