INCOME TAXES - Deferred (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Jun. 30, 2021	Jun. 30, 2020
Deferred tax assets:
Stock-based compensation	$ 1,490	$ 1,500	$ 1,313
Net operating losses	168	74	104
Foreign tax credits	28,148	24,615	17,159
Amortizable tax goodwill	57,926	62,191	67,287
Other	4,175	4,608	7,713
Total deferred tax assets	91,907	92,988	93,576
Valuation allowance	(62,721)	(61,888)	(60,604)
Net deferred tax assets	29,186	31,100	32,972
Deferred tax liabilities:
Mineral property basis	(70,922)	(70,352)	(67,639)
Unrealized foreign exchange gains	(582)	(582)	(582)
Investment in Peak Gold joint venture			(3,955)
Other	(199)	(172)	(346)
Total deferred tax liabilities	(71,703)	(71,106)	(72,522)
Total net deferred taxes	(42,517)	(40,006)	(39,550)
Net operating loss carry forwards	$ 200	$ 100	$ 100