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Financial Instruments (Tables)
 12 Months Ended
Apr. 30, 2019
Statement [LineItems]  
Summary of Financial Assets And Liabilities

At April 30, 2019, the Company had the following financial assets and liabilities denominated in CAD and denominated in MXN$:

 

In ‘000 of

    CAD      MXN$  

Cash

    $ 117      MP  3,170  

Other working capital amounts – net

    $ 859      MP  11,738  

Long-term liabilities

    $ (3,177 )     MP  0  
Liquidity risk [member]  
Statement [LineItems]  
Summary of Obligations Due

Obligations due within twelve months

of April 30,

    2019      2020      2021      2022      2023 and
beyond		  

Trade and other payables

    $  3,399      $ —        $ —        $ —        $ —    

Current portion of loan payable

      1,507        —          —          —          —    

Non-Current portion of loan payable

      0        3,081        —          —          —    

Reclamation and closure obligations

    $ 0        —        $ —        $ —        $  1,254