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Rehabilitation and Closure Cost Provision (Tables)
 12 Months Ended
Apr. 30, 2020
Rehabilitation And Closure Cost Provision [Abstract]  
Description of Changes to the reclamation

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

 

 

 

April 30,

2020

 

 

April 30,

2019

 

Balance, beginning of period

 

$

1,254

 

 

$

1,162

 

Accretion expense

 

 

72

 

 

 

90

 

Foreign exchange fluctuation

 

 

(312

)

 

 

2

 

 

 

$

1,014

 

 

$

1,254