SEGMENT INFORMATION (Details) $ in Thousands	6 Months Ended	12 Months Ended
	Dec. 31, 2021 USD ($)	Dec. 31, 2022 USD ($) segment	Dec. 31, 2021 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 interest	$ 2,443,752	$ 3,237,402	$ 2,443,752
Revenue	342,952	603,206	653,568	$ 615,856	$ 498,819
Cost of sales	52,329	94,642	98,467	92,898	83,890
Production taxes	4,412	7,021	8,399	6,743	3,824
Depletion	99,470	178,442		183,213	175,047
Total segment gross profit	186,741	323,101		333,002	236,058
Canada
Long Lived Assets and Pre-Tax Income by Geographical Information
Stream and royalty interest	991,745	1,132,506	991,745
Dominican Republic
Long Lived Assets and Pre-Tax Income by Geographical Information
Stream and royalty interest	350,083	320,867	350,083
Africa
Long Lived Assets and Pre-Tax Income by Geographical Information
Stream and royalty interest	297,890	300,043	297,890
Chile
Long Lived Assets and Pre-Tax Income by Geographical Information
Stream and royalty interest	473,263	460,428	473,263
United States
Long Lived Assets and Pre-Tax Income by Geographical Information
Stream and royalty interest	107,761	823,203	107,761
Mexico
Long Lived Assets and Pre-Tax Income by Geographical Information
Stream and royalty interest	60,977	50,156	60,977
Australia
Long Lived Assets and Pre-Tax Income by Geographical Information
Stream and royalty interest	27,496	22,120	27,496
Rest of world
Long Lived Assets and Pre-Tax Income by Geographical Information
Stream and royalty interest	134,537	128,079	134,537
Stream interests
Long Lived Assets and Pre-Tax Income by Geographical Information
Stream and royalty interest	1,584,045	1,470,298	1,584,045
Revenue	226,551	417,793		423,989	359,868
Cost of sales	52,329	94,642		92,898	83,890
Depletion	82,603	143,526		150,594	144,678
Total segment gross profit	91,619	179,625		180,497	131,300
Stream interests | Canada
Long Lived Assets and Pre-Tax Income by Geographical Information
Stream and royalty interest	579,326	511,957	579,326
Revenue	115,544	212,369		190,537	158,736
Stream interests | Dominican Republic
Long Lived Assets and Pre-Tax Income by Geographical Information
Stream and royalty interest	350,083	320,867	350,083
Revenue	52,958	85,863		115,583	96,978
Stream interests | Africa
Long Lived Assets and Pre-Tax Income by Geographical Information
Stream and royalty interest	297,569	299,722	297,569
Revenue	22,228	53,787		35,705	29,935
Stream interests | Chile
Long Lived Assets and Pre-Tax Income by Geographical Information
Stream and royalty interest	249,147	236,312	249,147
Revenue	28,075	47,347		82,164	74,219
Stream interests | Rest of world
Long Lived Assets and Pre-Tax Income by Geographical Information
Stream and royalty interest	107,920	101,440	107,920
Revenue	7,746	18,427
Royalty interests
Long Lived Assets and Pre-Tax Income by Geographical Information
Stream and royalty interest	859,707	1,767,104	859,707
Revenue	116,401	185,413		191,867	138,951
Production taxes	4,412	7,021		6,743	3,824
Depletion	16,867	34,916		32,619	30,369
Total segment gross profit	95,122	143,476		152,505	104,758
Royalty interests | Canada
Long Lived Assets and Pre-Tax Income by Geographical Information
Stream and royalty interest	412,419	620,549	412,419
Revenue	13,756	27,210		31,671	30,524
Royalty interests | Africa
Long Lived Assets and Pre-Tax Income by Geographical Information
Stream and royalty interest	321	321	321
Revenue	1,107	316		2,801	2,575
Royalty interests | Chile
Long Lived Assets and Pre-Tax Income by Geographical Information
Stream and royalty interest	224,116	224,116	224,116
Royalty interests | United States
Long Lived Assets and Pre-Tax Income by Geographical Information
Stream and royalty interest	107,761	823,203	107,761
Revenue	54,046	81,642		68,611	48,692
Royalty interests | Mexico
Long Lived Assets and Pre-Tax Income by Geographical Information
Stream and royalty interest	60,977	50,156	60,977
Revenue	31,858	52,388		58,212	32,731
Royalty interests | Australia
Long Lived Assets and Pre-Tax Income by Geographical Information
Stream and royalty interest	27,496	22,120	27,496
Revenue	11,174	15,672		21,466	15,252
Royalty interests | Rest of world
Long Lived Assets and Pre-Tax Income by Geographical Information
Stream and royalty interest	26,617	26,639	$ 26,617
Revenue	$ 4,460	$ 8,185		$ 9,106	$ 9,177