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STREAM AND ROYALTY INTERESTS, NET - Impairments (Details) - USD ($) $ in Thousands | 12 Months Ended
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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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