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NATURE OF OPERATIONS - Disclosure of subsidiaries (Details)
1 Months Ended 9 Months Ended 12 Months Ended
Nov. 07, 2011
Jun. 15, 2020
Apr. 30, 2012
May 31, 2022
Aug. 31, 2021
Platinum Group Metals (RSA) (Pty) Ltd. [Member]          
Nature of Operations [Line Items]          
Proportion of ownership interest       100.00% 100.00%
Mnombo Wethu Consultants (Pty) Limited [Member]          
Nature of Operations [Line Items]          
Proportion of ownership interest 49.90% 49.90%   49.90% 49.90%
Waterberg JV Resources (Pty) Ltd. [Member]          
Nature of Operations [Line Items]          
Proportion of ownership interest   37.05% 37.00% 37.05% 37.05%
Lion Battery Technologies Inc. [Member]          
Nature of Operations [Line Items]          
Proportion of ownership interest       53.70% 53.70%