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Financial Instruments (Tables)
 12 Months Ended
Apr. 30, 2018
Summary of Financial Assets And Liabilities

At April 30, 2018, the Company had the following financial assets and liabilities denominated in CAD and denominated in MXN$:

 

In ‘000 of

    CAD      MXN$  

Cash

    $ 245        MP 8,305  

Other working capital amounts—net

    $ (188 )       MP 44,441  
Liquidity risk [member]  
Summary of Obligations Due

Obligations due within twelve months
of April 30,

    2018      2019      2020      2021      2022 and
beyond		  

Trade and other payables

    $ 4,774      $ —        $ —        $ —        $ —    

Current portion of loan payable

      —          1,334        —          —          —    

Reclamation and closure obligations

    $ —        $ —        $ —        $ —        $ 1,280