STREAM AND ROYALTY INTERESTS, NET - Summary (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Jun. 30, 2020
Cost	$ 3,618,802	$ 3,553,950
Accumulated Depletion	(1,356,644)	(1,233,696)
Impairments		(1,341)
Net	2,262,158	2,318,913
Mount Milligan
Net	490,300
Rainy River
Net	134,000
Wassa
Net	67,600
Total production stage stream and royalty interests
Cost	2,939,871	3,018,837
Accumulated Depletion	(1,356,644)	(1,233,696)
Impairments		(1,341)
Net	1,583,227	1,783,800
Production stage stream interests
Cost	2,111,423	2,111,423
Accumulated Depletion	(796,299)	(645,705)
Net	1,315,124	1,465,718
Production stage stream interests | Mount Milligan
Cost	790,635	790,635
Accumulated Depletion	(300,378)	(236,352)
Net	490,257	554,283
Production stage stream interests | Pueblo Viejo
Cost	610,404	610,404
Accumulated Depletion	(243,706)	(203,935)
Net	366,698	406,469
Production stage stream interests | Andacollo
Cost	388,182	388,182
Accumulated Depletion	(131,578)	(110,521)
Net	256,604	277,661
Production stage stream interests | Rainy River
Cost	175,727	175,727
Accumulated Depletion	(41,772)	(27,278)
Net	133,955	148,449
Production stage stream interests | Wassa
Cost	146,475	146,475
Accumulated Depletion	(78,865)	(67,619)
Net	67,610	78,856
Production stage royalty interests
Cost	828,448	907,414
Accumulated Depletion	(560,345)	(587,991)
Impairments		(1,341)
Net	268,103	318,082
Production stage royalty interests | Voisey's Bay
Cost	205,724	205,724
Accumulated Depletion	(109,850)	(101,381)
Net	95,874	104,343
Production stage royalty interests | Penasquito
Cost	99,172	99,172
Accumulated Depletion	(50,176)	(44,614)
Net	48,996	54,558
Production stage royalty interests | Cortez
Cost	80,681	80,681
Accumulated Depletion	(19,128)	(15,065)
Net	61,553	65,616
Production stage royalty interests | Other
Cost	442,871	521,837
Accumulated Depletion	(381,191)	(426,931)
Impairments		(1,341)
Net	61,680	93,565
Total development stage stream and royalty interests
Cost	335,717	219,597
Net	335,717	219,597
Development stage stream interests | Khoemacau
Cost	223,502	136,608
Net	223,502	136,608
Development stage stream interests | Other
Cost	12,037	12,037
Net	12,037	12,037
Development stage royalty interests | Ct
Cost	45,423
Net	45,423
Development stage royalty interests | Other
Cost	54,755	70,952
Net	54,755	70,952
Exploration stage royalty interests
Cost	343,214	315,516
Net	343,214	315,516
Exploration stage royalty interests | Ct
Cost	29,610
Net	29,610
Exploration stage royalty interests | Pascua-Lama
Cost	177,690	177,690
Net	177,690	177,690
Exploration stage royalty interests | Other
Cost	135,914	137,826
Net	$ 135,914	$ 137,826