SEGMENT INFORMATION (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023 USD ($)	Jun. 30, 2022 USD ($)	Jun. 30, 2023 USD ($) segment	Jun. 30, 2022 USD ($)	Dec. 31, 2022 USD ($)
Long Lived Assets and Pre-Tax Income by Geographical Information
Number of reportable segments | segment			2
Stream and royalty interest	$ 3,155,561		$ 3,155,561		$ 3,237,402
Revenue	144,042	$ 146,441	314,434	$ 308,796
Cost of sales	23,367	23,810	48,387	46,450
Production taxes	1,274	1,425	3,263	3,646
Depletion	38,297	43,865	84,512	91,730
Total segment gross profit	81,104	77,341	178,272	166,970
Canada
Long Lived Assets and Pre-Tax Income by Geographical Information
Stream and royalty interest	1,101,522		1,101,522		1,132,506
Dominican Republic
Long Lived Assets and Pre-Tax Income by Geographical Information
Stream and royalty interest	314,998		314,998		320,867
Africa
Long Lived Assets and Pre-Tax Income by Geographical Information
Stream and royalty interest	280,838		280,838		300,043
Chile
Long Lived Assets and Pre-Tax Income by Geographical Information
Stream and royalty interest	454,537		454,537		460,428
United States
Long Lived Assets and Pre-Tax Income by Geographical Information
Stream and royalty interest	810,487		810,487		823,203
Mexico
Long Lived Assets and Pre-Tax Income by Geographical Information
Stream and royalty interest	45,703		45,703		50,156
Australia
Long Lived Assets and Pre-Tax Income by Geographical Information
Stream and royalty interest	21,743		21,743		22,120
Rest of world
Long Lived Assets and Pre-Tax Income by Geographical Information
Stream and royalty interest	125,733		125,733		128,079
Stream interests
Long Lived Assets and Pre-Tax Income by Geographical Information
Stream and royalty interest	1,409,633		1,409,633		1,470,298
Revenue	106,015	104,879	221,005	210,130
Cost of sales	23,367	23,810	48,387	46,450
Depletion	29,352	37,790	63,104	74,169
Total segment gross profit	53,296	43,279	109,514	89,511
Stream interests | Canada
Long Lived Assets and Pre-Tax Income by Geographical Information
Stream and royalty interest	484,602		484,602		511,957
Revenue	50,848	54,591	107,829	106,077
Stream interests | Dominican Republic
Long Lived Assets and Pre-Tax Income by Geographical Information
Stream and royalty interest	314,998		314,998		320,867
Revenue	23,540	19,812	45,899	43,076
Stream interests | Africa
Long Lived Assets and Pre-Tax Income by Geographical Information
Stream and royalty interest	280,517		280,517		299,722
Revenue	18,763	14,540	36,301	25,375
Stream interests | Chile
Long Lived Assets and Pre-Tax Income by Geographical Information
Stream and royalty interest	230,421		230,421		236,312
Revenue	7,823	11,721	20,757	27,395
Stream interests | Rest of world
Long Lived Assets and Pre-Tax Income by Geographical Information
Stream and royalty interest	99,095		99,095		101,440
Revenue	5,041	4,215	10,219	8,207
Royalty interests
Long Lived Assets and Pre-Tax Income by Geographical Information
Stream and royalty interest	1,745,928		1,745,928		1,767,104
Revenue	38,027	41,562	93,429	98,666
Production taxes	1,274	1,425	3,263	3,646
Depletion	8,945	6,075	21,408	17,561
Total segment gross profit	27,808	34,062	68,758	77,459
Royalty interests | Canada
Long Lived Assets and Pre-Tax Income by Geographical Information
Stream and royalty interest	616,920		616,920		620,549
Revenue	(97)	5,773	6,495	16,551
Royalty interests | Africa
Long Lived Assets and Pre-Tax Income by Geographical Information
Stream and royalty interest	321		321		321
Revenue		114		430
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	810,487		810,487		823,203
Revenue	23,265	16,845	56,845	41,202
Royalty interests | Mexico
Long Lived Assets and Pre-Tax Income by Geographical Information
Stream and royalty interest	45,703		45,703		50,156
Revenue	8,155	11,940	17,449	27,821
Royalty interests | Australia
Long Lived Assets and Pre-Tax Income by Geographical Information
Stream and royalty interest	21,743		21,743		22,120
Revenue	5,081	4,040	9,180	8,086
Royalty interests | Rest of world
Long Lived Assets and Pre-Tax Income by Geographical Information
Stream and royalty interest	26,638		26,638		$ 26,639
Revenue	$ 1,623	$ 2,850	$ 3,460	$ 4,576