ROYALTY INTERESTS IN MINERAL PROPERTIES (Details) (USD $) In Thousands	Sep. 30, 2011	Jun. 30, 2011
Principal royalty interests in mineral properties
Cost	$ 1,882,186	$ 1,882,186
Restructuring	(1,328)
Accumulated Depletion	(208,915)	(191,747)
Net	1,671,943	1,690,439
Production stage royalty interests
Principal royalty interests in mineral properties
Cost	1,059,805	1,054,539
Accumulated Depletion	(208,915)	(191,747)
Net	850,890	862,792
Production stage royalty interests | Andacollo
Principal royalty interests in mineral properties
Cost	272,998	272,998
Accumulated Depletion	(17,065)	(13,076)
Net	255,933	259,922
Production stage royalty interests | Voisey's Bay
Principal royalty interests in mineral properties
Cost	150,138	150,138
Accumulated Depletion	(18,505)	(15,526)
Net	131,633	134,612
Production stage royalty interests | Penasquito
Principal royalty interests in mineral properties
Cost	99,172	99,172
Accumulated Depletion	(6,209)	(5,457)
Net	92,963	93,715
Production stage royalty interests | Las Cruces
Principal royalty interests in mineral properties
Cost	57,230	57,230
Accumulated Depletion	(3,318)	(2,615)
Net	53,912	54,615
Production stage royalty interests | Mulatos
Principal royalty interests in mineral properties
Cost	48,092	48,092
Accumulated Depletion	(14,986)	(14,199)
Net	33,106	33,893
Production stage royalty interests | Wolverine
Principal royalty interests in mineral properties
Cost	45,158	45,158
Accumulated Depletion	(260)	(257)
Net	44,898	44,901
Production stage royalty interests | Dolores
Principal royalty interests in mineral properties
Cost	44,878	44,878
Accumulated Depletion	(4,500)	(4,005)
Net	40,378	40,873
Production stage royalty interests | Canadian Malartic
Principal royalty interests in mineral properties
Cost	38,800	38,800
Accumulated Depletion	(999)	(367)
Net	37,801	38,433
Production stage royalty interests | Gwalia Deeps
Principal royalty interests in mineral properties
Cost	28,119	22,854
Accumulated Depletion	(2,270)	(1,715)
Net	25,849	21,139
Production stage royalty interests | Holt
Principal royalty interests in mineral properties
Cost	25,428	25,428
Accumulated Depletion	(1,115)	(620)
Net	24,313	24,808
Production stage royalty interests | Inata
Principal royalty interests in mineral properties
Cost	24,871	24,871
Accumulated Depletion	(5,892)	(5,158)
Net	18,979	19,713
Production stage royalty interests | Leeville
Principal royalty interests in mineral properties
Cost	18,322	18,322
Accumulated Depletion	(13,372)	(12,920)
Net	4,950	5,402
Production stage royalty interests | Robinson
Principal royalty interests in mineral properties
Cost	17,825	17,825
Accumulated Depletion	(9,119)	(8,827)
Net	8,706	8,998
Production stage royalty interests | Cortez
Principal royalty interests in mineral properties
Cost	10,630	10,630
Accumulated Depletion	(9,637)	(9,619)
Net	993	1,011
Production stage royalty interests | Other.
Principal royalty interests in mineral properties
Cost	178,144	178,143
Accumulated Depletion	(101,668)	(97,386)
Net	76,476	80,757
Development stage royalty interests
Principal royalty interests in mineral properties
Cost	625,952	625,951
Restructuring	(1,328)
Net	624,624	625,951
Development stage royalty interests | Other.
Principal royalty interests in mineral properties
Cost	26,251	26,250
Restructuring	(1,328)
Net	24,923	26,250
Development stage royalty interests | Pascua-Lama
Principal royalty interests in mineral properties
Cost	372,105	372,105
Net	372,105	372,105
Development stage royalty interests | Mt. Milligan
Principal royalty interests in mineral properties
Cost	227,596	227,596
Net	227,596	227,596
Exploration stage royalty interests
Principal royalty interests in mineral properties
Cost	196,429	201,696
Net	$ 196,429	$ 201,696