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Rehabilitation and Closure Cost Provision (Tables)
 12 Months Ended
Apr. 30, 2018
Text block1 [abstract]  
Description of Changes to the reclamation

Changes to the reclamation and closure cost balance during the year are as follows:

 

     April 30,
2018		      April 30,
2017		  

Balance, beginning of year

    $ 1,131      $ 1,091  

Accretion expense

      64        80  

Foreign exchange fluctuation

      (33 )       (40 ) 
  

 

 

     

 

 

  

Balance, end of year

    $ 1,162      $ 1,131