Restoration provisions - Summary Of Change In Restoration And Rehabilitation Costs (Detail)	12 Months Ended
Oct. 31, 2020 USD ($)
Provision for decommissioning, restoration and rehabilitation costs [abstract]
Restoration provisions	$ 0
Initial recognition in 2020	321,400
Restoration provisions	$ 321,400

The amount of non-current provision for decommissioning, restoration and rehabilitation costs. [Refer: Provision for decommissioning, restoration and rehabilitation costs]

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Name IAS
-Number 37
-IssueDate 2020-01-01
-Section D Examples: disclosures
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-URIDate 2020-01-01

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Name IAS
-Number 37
-IssueDate 2020-01-01
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-URIDate 2020-01-01

Name:	ifrs-full_LongtermProvisionForDecommissioningRestorationAndRehabilitationCosts
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant