SEGMENT INFORMATION (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2023 USD ($) segment	Mar. 31, 2022 USD ($)	Dec. 31, 2022 USD ($)
Long Lived Assets and Pre-Tax Income by Geographical Information
Number of reportable segments | segment	2
Stream and royalty interest	$ 3,191,385		$ 3,237,402
Revenue	170,392	$ 162,355
Cost of sales	25,020	22,639
Production taxes	1,989	2,221
Depletion	46,214	47,863
Total segment gross profit	97,169	89,632
Canada
Long Lived Assets and Pre-Tax Income by Geographical Information
Stream and royalty interest	1,114,552		1,132,506
Dominican Republic
Long Lived Assets and Pre-Tax Income by Geographical Information
Stream and royalty interest	317,903		320,867
Africa
Long Lived Assets and Pre-Tax Income by Geographical Information
Stream and royalty interest	290,446		300,043
Chile
Long Lived Assets and Pre-Tax Income by Geographical Information
Stream and royalty interest	456,679		460,428
United States
Long Lived Assets and Pre-Tax Income by Geographical Information
Stream and royalty interest	816,336		823,203
Mexico
Long Lived Assets and Pre-Tax Income by Geographical Information
Stream and royalty interest	47,936		50,156
Australia
Long Lived Assets and Pre-Tax Income by Geographical Information
Stream and royalty interest	21,949		22,120
Rest of world
Long Lived Assets and Pre-Tax Income by Geographical Information
Stream and royalty interest	125,584		128,079
Stream interests
Long Lived Assets and Pre-Tax Income by Geographical Information
Stream and royalty interest	1,436,546		1,470,298
Revenue	114,990	105,251
Cost of sales	25,020	22,639
Depletion	33,752	36,378
Total segment gross profit	56,218	46,234
Stream interests | Canada
Long Lived Assets and Pre-Tax Income by Geographical Information
Stream and royalty interest	497,010		511,957
Revenue	56,981	51,485
Stream interests | Dominican Republic
Long Lived Assets and Pre-Tax Income by Geographical Information
Stream and royalty interest	317,903		320,867
Revenue	22,358	23,264
Stream interests | Africa
Long Lived Assets and Pre-Tax Income by Geographical Information
Stream and royalty interest	290,125		299,722
Revenue	17,539	8,446
Stream interests | Chile
Long Lived Assets and Pre-Tax Income by Geographical Information
Stream and royalty interest	232,563		236,312
Revenue	12,934	15,674
Stream interests | Rest of world
Long Lived Assets and Pre-Tax Income by Geographical Information
Stream and royalty interest	98,945		101,440
Revenue	5,178	6,382
Royalty interests
Long Lived Assets and Pre-Tax Income by Geographical Information
Stream and royalty interest	1,754,839		1,767,104
Revenue	55,402	57,104
Production taxes	1,989	2,221
Depletion	12,462	11,485
Total segment gross profit	40,951	43,398
Royalty interests | Canada
Long Lived Assets and Pre-Tax Income by Geographical Information
Stream and royalty interest	617,542		620,549
Revenue	6,591	10,778
Royalty interests | Africa
Long Lived Assets and Pre-Tax Income by Geographical Information
Stream and royalty interest	321		321
Revenue		316
Royalty interests | Chile
Long Lived Assets and Pre-Tax Income by Geographical Information
Stream and royalty interest	224,116		224,116
Royalty interests | United States
Long Lived Assets and Pre-Tax Income by Geographical Information
Stream and royalty interest	816,336		823,203
Revenue	33,581	24,358
Royalty interests | Mexico
Long Lived Assets and Pre-Tax Income by Geographical Information
Stream and royalty interest	47,936		50,156
Revenue	9,295	15,881
Royalty interests | Australia
Long Lived Assets and Pre-Tax Income by Geographical Information
Stream and royalty interest	21,949		22,120
Revenue	4,099	4,046
Royalty interests | Rest of world
Long Lived Assets and Pre-Tax Income by Geographical Information
Stream and royalty interest	26,639		$ 26,639
Revenue	$ 1,836	$ 1,725