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STREAM AND ROYALTY INTERESTS, NET - Summary (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Jun. 30, 2018
--- | --- | ---
Cost | $ 3,397,998 | $ 3,636,306
Accumulated Depletion | (1,058,682) | (895,825)
Impairments |  | (239,364)
Net | 2,339,316 | 2,501,117
Pascua-Lama |  |
Net | 177,700 |
Total production stage stream and royalty interests |  |
Cost | 2,959,033 | 2,955,604
Accumulated Depletion | (1,058,682) | (895,825)
Net | 1,900,351 | 2,059,779
Production stage stream interests |  |
Cost | 2,111,423 | 2,111,423
Accumulated Depletion | (501,026) | (373,257)
Net | 1,610,397 | 1,738,166
Production stage stream interests | Mount Milligan |  |
Cost | 790,635 | 790,635
Accumulated Depletion | (184,091) | (152,833)
Net | 606,544 | 637,802
Production stage stream interests | Pueblo Viejo |  |
Cost | 610,404 | 610,404
Accumulated Depletion | (158,819) | (114,944)
Net | 451,585 | 495,460
Production stage stream interests | Andacollo |  |
Cost | 388,182 | 388,182
Accumulated Depletion | (86,675) | (59,851)
Net | 301,507 | 328,331
Production stage stream interests | Rainy River |  |
Cost | 175,727 | 175,727
Accumulated Depletion | (14,522) | (4,028)
Net | 161,205 | 171,699
Production stage stream interests | Wassa and Prestea |  |
Cost | 146,475 | 146,475
Accumulated Depletion | (56,919) | (41,601)
Net | 89,556 | 104,874
Production stage royalty interests |  |
Cost | 847,610 | 844,181
Accumulated Depletion | (557,656) | (522,568)
Net | 289,954 | 321,613
Production stage royalty interests | Voisey's Bay |  |
Cost | 205,724 | 205,724
Accumulated Depletion | (95,564) | (86,933)
Net | 110,160 | 118,791
Production stage royalty interests | Penasquito |  |
Cost | 99,172 | 99,172
Accumulated Depletion | (40,659) | (38,426)
Net | 58,513 | 60,746
Production stage royalty interests | Holt |  |
Cost | 34,612 | 34,612
Accumulated Depletion | (22,570) | (21,173)
Net | 12,042 | 13,439
Production stage royalty interests | Cortez |  |
Cost | 20,878 | 20,878
Accumulated Depletion | (12,362) | (11,241)
Net | 8,516 | 9,637
Production stage royalty interests | Other |  |
Cost | 487,224 | 483,795
Accumulated Depletion | (386,501) | (364,795)
Net | 100,723 | 119,000
Total development stage stream and royalty interests |  |
Cost | 142,793 | 146,451
Impairments |  | (284)
Net | 142,793 | 146,167
Development stage stream interests | Other |  |
Cost | 12,038 | 12,038
Net | 12,038 | 12,038
Development stage royalty interests |  |
Cost | 130,755 | 134,413
Impairments |  | (284)
Net | 130,755 | 134,129
Development stage royalty interests | Cortez |  |
Cost | 59,803 | 59,803
Net | 59,803 | 59,803
Development stage royalty interests | Other |  |
Cost | 70,952 | 74,610
Impairments |  | (284)
Net | 70,952 | 74,326
Exploration stage royalty interests |  |
Cost | 296,172 | 534,251
Impairments |  | (239,080)
Net | 296,172 | 295,171
Exploration stage royalty interests | Pascua-Lama |  |
Cost | 177,690 | 416,770
Impairments |  | (239,080)
Net | 177,690 | 177,690
Exploration stage royalty interests | Other |  |
Cost | 118,482 | 117,481
Net | $ 118,482 | $ 117,481

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