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STREAM AND ROYALTY INTERESTS, NET - Impairments (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Impairments of royalty and stream interests		$ 239,364
Value of stream and royalty interests, net	$ 2,339,316	2,501,117
Royalty interests
Impairments of royalty and stream interests		239,364
Pascua-Lama
Copper NSR (as a percent)	1.09%
Value of stream and royalty interests, net	$ 177,700
Pascua-Lama | Minimum
Net smelter return (NSR) (as a percent)	0.78%
Pascua-Lama | Maximum
Net smelter return (NSR) (as a percent)	5.45%
Pascua-Lama | Royalty interests
Impairments of royalty and stream interests		239,080
Other | Royalty interests
Impairments of royalty and stream interests		$ 284
El Toqui
Value of stream and royalty interests, net	$ 1,400

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Mineral properties, net of adjustments.

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