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Restoration provisions
 12 Months Ended
Oct. 31, 2021
Statement [Line Items]  
Restoration provisions
16.
Restoration provisions
The Company has a legal obligation to complete the site restoration and decommissioning of its leased plant properties in New York and Ontario. The provision for decommissioning and site restoration is determined using the estimated costs provided by the New York Department of Environmental Conservation and Ontario Ministry of the Environment, Conservation and Parks.

The following table represents the continuity of the restoration provision associated with the Company’s leased plant properties:
 
Restoration provisions at October 31, 2019
    $ —    
Initial recognition
    $ 321,400  
Interest Recognized
    $ —    
    
 
 
  
Restoration provisions at October 31, 2020
   
$
321,400
 
    
 
 
  
Interest Recognized
      3,194  
Foreign exchange recognized
      9,639  
    
 
 
  
Restoration provisions at October 31, 2021
   
$
334,233
 
    
 
 
  
The present value of the restoration provision of $334,233 was calculated using an average risk-free rate of 0.61%.