SEGMENT INFORMATION (Details) $ in Thousands	6 Months Ended	12 Months Ended
	Dec. 31, 2021 USD ($)	Dec. 31, 2023 USD ($) segment	Dec. 31, 2022 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)
Long Lived Assets and Pre-Tax Income by Geographical Information
Number of reportable segments | segment		2
Stream and royalty interests, net (Note 4)		$ 3,075,574	$ 3,237,402
Revenue	$ 342,952	605,717	603,206	$ 615,856
Cost of sales	52,329	90,523	94,642	92,898
Production taxes	4,412	7,294	7,021	6,743
Depletion	99,470	164,506	178,442	183,213
Total segment gross profit	186,741	343,394	323,101	333,002
Canada
Long Lived Assets and Pre-Tax Income by Geographical Information
Stream and royalty interests, net (Note 4)		1,076,298	1,132,506
Dominican Republic
Long Lived Assets and Pre-Tax Income by Geographical Information
Stream and royalty interests, net (Note 4)		311,050	320,867
Africa
Long Lived Assets and Pre-Tax Income by Geographical Information
Stream and royalty interests, net (Note 4)		264,850	300,043
Chile
Long Lived Assets and Pre-Tax Income by Geographical Information
Stream and royalty interests, net (Note 4)		446,745	460,428
United States
Long Lived Assets and Pre-Tax Income by Geographical Information
Stream and royalty interests, net (Note 4)		794,891	823,203
Mexico
Long Lived Assets and Pre-Tax Income by Geographical Information
Stream and royalty interests, net (Note 4)		41,803	50,156
Australia
Long Lived Assets and Pre-Tax Income by Geographical Information
Stream and royalty interests, net (Note 4)		21,288	22,120
Rest of world
Long Lived Assets and Pre-Tax Income by Geographical Information
Stream and royalty interests, net (Note 4)		118,649	128,079
Stream interests
Long Lived Assets and Pre-Tax Income by Geographical Information
Stream and royalty interests, net (Note 4)		1,351,616	1,470,298
Revenue	226,551	418,280	417,793	423,989	$ 423,989
Cost of sales	52,329	90,523	94,642		92,898
Depletion	82,603	121,121	143,526		150,594
Total segment gross profit	91,619	206,636	179,625		$ 180,497
Stream interests | Canada
Long Lived Assets and Pre-Tax Income by Geographical Information
Stream and royalty interests, net (Note 4)		461,398	511,957
Revenue	115,544	196,961	212,369	190,537
Stream interests | Dominican Republic
Long Lived Assets and Pre-Tax Income by Geographical Information
Stream and royalty interests, net (Note 4)		311,050	320,867
Revenue	52,958	76,247	85,863	115,583
Stream interests | Africa
Long Lived Assets and Pre-Tax Income by Geographical Information
Stream and royalty interests, net (Note 4)		264,529	299,722
Revenue	22,228	70,757	53,787	35,705
Stream interests | Chile
Long Lived Assets and Pre-Tax Income by Geographical Information
Stream and royalty interests, net (Note 4)		222,629	236,312
Revenue	28,075	48,920	47,347	82,164
Stream interests | Rest of world
Long Lived Assets and Pre-Tax Income by Geographical Information
Stream and royalty interests, net (Note 4)		92,010	101,440
Revenue	7,746	25,395	18,427
Royalty interests
Long Lived Assets and Pre-Tax Income by Geographical Information
Stream and royalty interests, net (Note 4)		1,723,958	1,767,104
Revenue	116,401	187,437	185,413	191,867
Production taxes	4,412	7,294	7,021	6,743
Depletion	16,867	43,385	34,916	32,619
Total segment gross profit	95,122	136,758	143,476	152,505
Royalty interests | Canada
Long Lived Assets and Pre-Tax Income by Geographical Information
Stream and royalty interests, net (Note 4)		614,900	620,549
Revenue	13,756	12,712	27,210	31,671
Royalty interests | Africa
Long Lived Assets and Pre-Tax Income by Geographical Information
Stream and royalty interests, net (Note 4)		321	321
Revenue	1,107		316	2,801
Royalty interests | Chile
Long Lived Assets and Pre-Tax Income by Geographical Information
Stream and royalty interests, net (Note 4)		224,116	224,116
Royalty interests | United States
Long Lived Assets and Pre-Tax Income by Geographical Information
Stream and royalty interests, net (Note 4)		794,891	823,203
Revenue	54,046	123,690	81,642	68,611
Royalty interests | Mexico
Long Lived Assets and Pre-Tax Income by Geographical Information
Stream and royalty interests, net (Note 4)		41,803	50,156
Revenue	31,858	25,754	52,388	58,212
Royalty interests | Australia
Long Lived Assets and Pre-Tax Income by Geographical Information
Stream and royalty interests, net (Note 4)		21,288	22,120
Revenue	11,174	19,011	15,672	21,466
Royalty interests | Rest of world
Long Lived Assets and Pre-Tax Income by Geographical Information
Stream and royalty interests, net (Note 4)		26,639	26,639
Revenue	$ 4,460	$ 6,270	$ 8,185	$ 9,106