INCOME TAXES - Schedule of Deferred Income Tax Assets and Liabilities (Details) - USD ($)	Dec. 31, 2021	Jun. 30, 2021	Jun. 30, 2020
Deferred tax assets
Accrued expenditures	$ 691,908	$ 285,808	$ 72,006
Exploration and mine development expenditures	7,686,371	6,305,141	3,811,288
Stock-based compensation	656,617	730,339	441,169
Tax carryforwards	7,993,664	6,039,013	4,266,906
Other deferred tax assets	177,512	39,476	76,581
Gross deferred tax assets	17,206,072	13,399,777	8,667,950
Valuation allowance	(17,186,537)	(13,354,675)	(8,589,012)
Deferred tax assets	19,535	45,102	78,938
Deferred tax liabilities
Other deferred tax liabilities	(19,535)	(45,102)	(78,938)
Deferred tax liabilities	(19,535)	(45,102)	(78,938)
Net deferred tax asset (liability)	$ 0	$ 0	$ 0