INCOME TAXES - Deferred (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Jun. 30, 2019
Deferred tax assets:
Stock-based compensation	$ 1,313	$ 1,118
Net operating losses	104	56
Foreign tax credits	17,159	11,125
Amortizable tax goodwill	67,287
Other	7,713	7,960
Total deferred tax assets	93,576	20,259
Valuation allowance	(60,604)	(12,764)
Net deferred tax assets	32,972	7,495
Deferred tax liabilities:
Mineral property basis	(67,639)	(74,360)
Unrealized foreign exchange gains	(582)	(582)
Investment in Peak Gold joint venture	(3,955)	(4,353)
Other	(346)	(150)
Total deferred tax liabilities	(72,522)	(79,445)
Total net deferred taxes	(39,550)	(71,950)
Net operating loss carry forwards	$ 400	$ 200