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ROYALTY AND STREAM INTERESTS (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
Royalty and stream interests |  |  |  |
Cost |  |  | $ 2,647,976 | $ 2,551,727
Accumulated Depletion |  |  | (536,029) | (442,660)
Impairments |  |  | (28,339) |
Total royalty and stream interest, net |  |  | 2,083,608 | 2,109,067
Impairments |  |  | 28,339 |
Royalty Receivables |  |  | 37,681 | 46,654
Return of advance payment |  |  | 10,000 |
Prepaid expenses and other |  |  | 3,798 | 7,840
Other |  |  |  |
Royalty and stream interests |  |  |  |
Impairments |  |  | 2,372 |
Wolverine |  |  |  |
Royalty and stream interests |  |  |  |
Total royalty and stream interest, net |  |  | 5,300 |
Impairments |  |  | $ 25,967 |
Royalty Receivables | $ 3,000 |  |  |
Allowance for royalty receivables | 3,000 |  |  |
Wolverine | Minimum |  |  |  |
Royalty and stream interests |  |  |  |
Percentage of royalty interests acquired |  |  | 0.00% |
Wolverine | Maximum |  |  |  |
Royalty and stream interests |  |  |  |
Percentage of royalty interests acquired |  |  | 9.445% |
Tulsequah |  |  |  |
Royalty and stream interests |  |  |  |
Material properties net related to investments |  | $ 10,000 |  |
Material properties net direct acquisition costs |  | 600 |  |
Total royalty and stream interest, net | 0 |  |  |
Impairments | $ 600 |  |  |
Chieftain |  |  |  |
Royalty and stream interests |  |  |  |
Return of advance payment |  |  | $ 10,000 |
Production Stage Royalty Interest |  |  |  |
Royalty and stream interests |  |  |  |
Cost |  |  | 1,129,230 | 1,121,776
Accumulated Depletion |  |  | (500,834) | (434,919)
Impairments |  |  | (27,586) |
Total royalty and stream interest, net |  |  | 600,810 | 686,857
Production Stage Royalty Interest | Andacollo |  |  |  |
Royalty and stream interests |  |  |  |
Cost |  |  | 272,998 | 272,998
Accumulated Depletion |  |  | (65,467) | (56,147)
Total royalty and stream interest, net |  |  | 207,531 | 216,851
Production Stage Royalty Interest | Voisey's Bay |  |  |  |
Royalty and stream interests |  |  |  |
Cost |  |  | 150,138 | 150,138
Accumulated Depletion |  |  | (76,141) | (67,377)
Total royalty and stream interest, net |  |  | 73,997 | 82,761
Production Stage Royalty Interest | Penasquito |  |  |  |
Royalty and stream interests |  |  |  |
Cost |  |  | 99,172 | 99,172
Accumulated Depletion |  |  | (24,555) | (17,801)
Total royalty and stream interest, net |  |  | 74,617 | 81,371
Production Stage Royalty Interest | Mulatos |  |  |  |
Royalty and stream interests |  |  |  |
Cost |  |  | 48,092 | 48,092
Accumulated Depletion |  |  | (32,313) | (28,548)
Total royalty and stream interest, net |  |  | 15,779 | 19,544
Production Stage Royalty Interest | Holt |  |  |  |
Royalty and stream interests |  |  |  |
Cost |  |  | 34,612 | 34,612
Accumulated Depletion |  |  | (13,950) | (10,474)
Total royalty and stream interest, net |  |  | 20,662 | 24,138
Production Stage Royalty Interest | Robinson |  |  |  |
Royalty and stream interests |  |  |  |
Cost |  |  | 17,825 | 17,825
Accumulated Depletion |  |  | (12,748) | (11,887)
Total royalty and stream interest, net |  |  | 5,077 | 5,938
Production Stage Royalty Interest | Cortez |  |  |  |
Royalty and stream interests |  |  |  |
Cost |  |  | 10,630 | 10,630
Accumulated Depletion |  |  | (9,933) | (9,772)
Total royalty and stream interest, net |  |  | 697 | 858
Production Stage Royalty Interest | Other |  |  |  |
Royalty and stream interests |  |  |  |
Cost |  |  | 495,763 | 488,309
Accumulated Depletion |  |  | (265,727) | (232,913)
Impairments |  |  | (27,586) |
Total royalty and stream interest, net |  |  | 202,450 | 255,396
Production Stage Stream Interests | Mt. Milligan |  |  |  |
Royalty and stream interests |  |  |  |
Cost |  |  | 783,046 | 783,046
Accumulated Depletion |  |  | (35,195) | (7,741)
Total royalty and stream interest, net |  |  | 747,851 | 775,305
Production Stage Royalty and Stream Interests |  |  |  |
Royalty and stream interests |  |  |  |
Cost |  |  | 1,912,276 | 1,904,822
Accumulated Depletion |  |  | (536,029) | (442,660)
Impairments |  |  | (27,586) |
Total royalty and stream interest, net |  |  | 1,348,661 | 1,462,162
Development Stage Royalty Interest |  |  |  |
Royalty and stream interests |  |  |  |
Cost |  |  | 439,122 | 441,593
Total royalty and stream interest, net |  |  | 439,122 | 441,593
Development Stage Royalty Interest | Other |  |  |  |
Royalty and stream interests |  |  |  |
Cost |  |  | 67,017 | 69,488
Total royalty and stream interest, net |  |  | 67,017 | 69,488
Development Stage Royalty Interest | Pascua Lama |  |  |  |
Royalty and stream interests |  |  |  |
Cost |  |  | 372,105 | 372,105
Total royalty and stream interest, net |  |  | 372,105 | 372,105
Development Stage Stream Interest |  |  |  |
Royalty and stream interests |  |  |  |
Cost |  |  | 84,026 | 41,103
Impairments |  |  | (603) |
Total royalty and stream interest, net |  |  | 83,423 | 41,103
Development Stage Stream Interest | Other |  |  |  |
Royalty and stream interests |  |  |  |
Cost |  |  | 8,183 | 10,483
Impairments |  |  | (603) |
Total royalty and stream interest, net |  |  | 7,580 | 10,483
Development Stage Stream Interest | Phoenix Gold |  |  |  |
Royalty and stream interests |  |  |  |
Cost |  |  | 75,843 | 30,620
Total royalty and stream interest, net |  |  | 75,843 | 30,620
Development Stage Royalty and Stream Interest |  |  |  |
Royalty and stream interests |  |  |  |
Cost |  |  | 523,148 | 482,696
Impairments |  |  | (603) |
Total royalty and stream interest, net |  |  | 522,545 | 482,696
Exploration Stage Royalty Interest |  |  |  |
Royalty and stream interests |  |  |  |
Cost |  |  | 212,552 | 164,209
Impairments |  |  | (150) |
Total royalty and stream interest, net |  |  | $ 212,402 | $ 164,209
Production Stage and Exploration Stage Royalty Interest |  |  |  |
Royalty and stream interests |  |  |  |
Impairments |  | $ 1,800 |  |

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