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Income Taxes (Schedule of Unrecognized Deductible Temporary Difference and Unused Tax Losses) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Income Taxes [line items]    
Non capital losses $ 73,994 $ 55,500
Provision and other 11,720 13,074
Share issue costs 4,473 624
Mineral properties, plant and equipment 762 1,801
Derivative liabilities   254
Capital losses 906 846
Unrecognized deductible temporary differences 91,855 72,099
MEXICO    
Income Taxes [line items]    
Non capital losses 332 450
Temporary differences associated with investments in subsidiaries, branches and associates and interests in joint arrangements for which deferred tax liabilities have not been recognised 69,044 66,035
PERU    
Income Taxes [line items]    
Temporary differences associated with investments in subsidiaries, branches and associates and interests in joint arrangements for which deferred tax liabilities have not been recognised $ 98,070 $ 58,017