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REVENUE - Disaggregation (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2019 USD ($) item | Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($)
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |  |
Number of revenue sources | item |  |  |  |  |  |  |  |  | 2 |  |
Revenue | $ 115,694 | $ 109,778 | $ 97,592 | $ 99,992 | $ 116,235 | $ 115,983 | $ 114,348 | $ 112,476 | $ 423,056 | $ 459,042 | $ 440,814
Stream interests |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 305,824 | 324,516 | 314,011
Stream interests | Mount Milligan |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 101,010 |  |
Stream interests | Pueblo Viejo |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 82,844 |  |
Stream interests | Andacollo |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 69,264 |  |
Stream interests | Wassa and Prestea |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 22,098 |  |
Stream interests | Rainy River |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 22,142 |  |
Stream interests | Other |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 8,466 |  |
Stream interests | Gold |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 249,496 |  |
Stream interests | Silver |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 33,282 |  |
Stream interests | Copper |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 23,046 |  |
Royalty interests |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 117,232 | $ 134,526 | $ 126,803
Royalty interests | Other |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 91,984 |  |
Royalty interests | Penasquito |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 13,865 |  |
Royalty interests | Cortez |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 11,383 |  |
Royalty interests | Gold |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 78,570 |  |
Royalty interests | Silver |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 5,497 |  |
Royalty interests | Copper |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 13,808 |  |
Royalty interests | Other |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | $ 19,357 |  |

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