SEGMENT INFORMATION (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2024 USD ($) segment	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Long Lived Assets and Pre-Tax Income by Geographical Information
Number of reportable segments | segment	2
Stream and royalty interests, net (Note 4)	$ 3,042,804	$ 3,075,574
Revenue	719,395	605,717	$ 603,206
Cost of sales	97,514	90,523	94,642
Production taxes	6,622	7,294	7,021
Depletion	144,085	164,506	178,442
Total segment gross profit	471,174	343,394	323,101
Canada
Long Lived Assets and Pre-Tax Income by Geographical Information
Stream and royalty interests, net (Note 4)	1,076,713	1,076,298
Dominican Republic
Long Lived Assets and Pre-Tax Income by Geographical Information
Stream and royalty interests, net (Note 4)	302,122	311,050
Africa
Long Lived Assets and Pre-Tax Income by Geographical Information
Stream and royalty interests, net (Note 4)	237,349	264,850
Chile
Long Lived Assets and Pre-Tax Income by Geographical Information
Stream and royalty interests, net (Note 4)	435,239	446,745
United States
Long Lived Assets and Pre-Tax Income by Geographical Information
Stream and royalty interests, net (Note 4)	827,277	794,891
Mexico
Long Lived Assets and Pre-Tax Income by Geographical Information
Stream and royalty interests, net (Note 4)	33,800	41,803
Australia
Long Lived Assets and Pre-Tax Income by Geographical Information
Stream and royalty interests, net (Note 4)	19,265	21,288
Rest of world
Long Lived Assets and Pre-Tax Income by Geographical Information
Stream and royalty interests, net (Note 4)	111,039	118,649
Stream interest
Long Lived Assets and Pre-Tax Income by Geographical Information
Stream and royalty interests, net (Note 4)	1,253,170	1,351,616
Revenue	483,294	418,280	417,793
Cost of sales	97,514	90,523	94,642
Production taxes	0	0	0
Depletion	102,800	121,121	143,526
Total segment gross profit	282,980	206,636	179,625
Stream interest | Canada
Long Lived Assets and Pre-Tax Income by Geographical Information
Stream and royalty interests, net (Note 4)	417,643	461,398
Revenue	231,801	196,961	212,369
Stream interest | Dominican Republic
Long Lived Assets and Pre-Tax Income by Geographical Information
Stream and royalty interests, net (Note 4)	302,122	311,050
Revenue	83,059	76,247	85,863
Stream interest | Africa
Long Lived Assets and Pre-Tax Income by Geographical Information
Stream and royalty interests, net (Note 4)	237,028	264,529
Revenue	82,132	70,757	53,787
Stream interest | Chile
Long Lived Assets and Pre-Tax Income by Geographical Information
Stream and royalty interests, net (Note 4)	211,123	222,629
Revenue	47,531	48,920	47,347
Stream interest | United States
Long Lived Assets and Pre-Tax Income by Geographical Information
Stream and royalty interests, net (Note 4)	0	0
Stream interest | Mexico
Long Lived Assets and Pre-Tax Income by Geographical Information
Stream and royalty interests, net (Note 4)	0	0
Stream interest | Australia
Long Lived Assets and Pre-Tax Income by Geographical Information
Stream and royalty interests, net (Note 4)	0	0
Stream interest | Rest of world
Long Lived Assets and Pre-Tax Income by Geographical Information
Stream and royalty interests, net (Note 4)	85,254	92,010
Revenue	38,771	25,395	18,427
Royalty interest
Long Lived Assets and Pre-Tax Income by Geographical Information
Stream and royalty interests, net (Note 4)	1,789,634	1,723,958
Revenue	236,101	187,437	185,413
Cost of sales	0	0	0
Production taxes	6,622	7,294	7,021
Depletion	41,285	43,385	34,916
Total segment gross profit	188,194	136,758	143,476
Royalty interest | Canada
Long Lived Assets and Pre-Tax Income by Geographical Information
Stream and royalty interests, net (Note 4)	659,070	614,900
Revenue	18,945	12,712	27,210
Royalty interest | Dominican Republic
Long Lived Assets and Pre-Tax Income by Geographical Information
Stream and royalty interests, net (Note 4)	0	0
Royalty interest | Africa
Long Lived Assets and Pre-Tax Income by Geographical Information
Stream and royalty interests, net (Note 4)	321	321
Royalty interest | Chile
Long Lived Assets and Pre-Tax Income by Geographical Information
Stream and royalty interests, net (Note 4)	224,116	224,116
Royalty interest | United States
Long Lived Assets and Pre-Tax Income by Geographical Information
Stream and royalty interests, net (Note 4)	827,277	794,891
Revenue	121,212	123,690	81,642
Royalty interest | Mexico
Long Lived Assets and Pre-Tax Income by Geographical Information
Stream and royalty interests, net (Note 4)	33,800	41,803
Revenue	52,842	25,754	52,388
Royalty interest | Australia
Long Lived Assets and Pre-Tax Income by Geographical Information
Stream and royalty interests, net (Note 4)	19,265	21,288
Revenue	28,966	19,011	15,672
Royalty interest | Rest of world
Long Lived Assets and Pre-Tax Income by Geographical Information
Stream and royalty interests, net (Note 4)	25,785	26,639
Revenue	$ 14,136	$ 6,270	$ 8,501