ROYALTY INTERESTS IN MINERAL PROPERTIES (Details) (USD $) In Thousands	Jun. 30, 2011	Jun. 30, 2010
Principal royalty interests in mineral properties
Cost	$ 1,882,186	$ 1,601,985
Accumulated Depletion	(191,747)	(125,186)
Net	1,690,439	1,476,799
Production stage royalty interests
Principal royalty interests in mineral properties
Cost	1,054,539	917,910
Accumulated Depletion	(191,747)	(125,186)
Net	862,792	792,724
Production stage royalty interests | Andacollo
Principal royalty interests in mineral properties
Cost	272,998	272,998
Accumulated Depletion	(13,076)	(1,143)
Net	259,922	271,855
Production stage royalty interests | Voisey's Bay
Principal royalty interests in mineral properties
Cost	150,138	150,138
Accumulated Depletion	(15,526)	(2,052)
Net	134,612	148,086
Production stage royalty interests | Penasquito
Principal royalty interests in mineral properties
Cost	99,172	99,172
Accumulated Depletion	(5,457)	(2,162)
Net	93,715	97,010
Production stage royalty interests | Las Cruces
Principal royalty interests in mineral properties
Cost	57,230	57,230
Accumulated Depletion	(2,615)	(490)
Net	54,615	56,740
Production stage royalty interests | Mulatos
Principal royalty interests in mineral properties
Cost	48,092	48,092
Accumulated Depletion	(14,199)	(10,177)
Net	33,893	37,915
Production stage royalty interests | Dolores
Principal royalty interests in mineral properties
Cost	44,878	44,878
Accumulated Depletion	(4,005)	(2,278)
Net	40,873	42,600
Production stage royalty interests | Wolverine
Principal royalty interests in mineral properties
Cost	45,158
Accumulated Depletion	(257)
Net	44,901
Production stage royalty interests | Canadian Malartic
Principal royalty interests in mineral properties
Cost	38,800
Accumulated Depletion	(367)
Net	38,433
Production stage royalty interests | Holt
Principal royalty interests in mineral properties
Cost	25,428
Accumulated Depletion	(620)
Net	24,808
Production stage royalty interests | Inata
Principal royalty interests in mineral properties
Cost	24,871
Accumulated Depletion	(5,158)
Net	19,713
Production stage royalty interests | Gwalia Deeps
Principal royalty interests in mineral properties
Cost	22,854	15,970
Accumulated Depletion	(1,715)	(416)
Net	21,139	15,554
Production stage royalty interests | Leeville
Principal royalty interests in mineral properties
Cost	18,322	18,322
Accumulated Depletion	(12,920)	(10,764)
Net	5,402	7,558
Production stage royalty interests | Robinson
Principal royalty interests in mineral properties
Cost	17,825	17,825
Accumulated Depletion	(8,827)	(7,678)
Net	8,998	10,147
Production stage royalty interests | Cortez
Principal royalty interests in mineral properties
Cost	10,630	10,630
Accumulated Depletion	(9,619)	(9,499)
Net	1,011	1,131
Production stage royalty interests | Other.
Principal royalty interests in mineral properties
Cost	178,143	149,085
Accumulated Depletion	(97,386)	(49,285)
Net	80,757	99,800
Production stage royalty interests | Taparko
Principal royalty interests in mineral properties
Cost		33,570
Accumulated Depletion		(29,242)
Net		4,328
Development stage royalty interests
Principal royalty interests in mineral properties
Cost	625,951	449,392
Net	625,951	449,392
Development stage royalty interests | Wolverine
Principal royalty interests in mineral properties
Cost		45,158
Net		45,158
Development stage royalty interests | Canadian Malartic
Principal royalty interests in mineral properties
Cost		35,500
Net		35,500
Development stage royalty interests | Other.
Principal royalty interests in mineral properties
Cost	26,250	50,733
Net	26,250	50,733
Development stage royalty interests | Pascua-Lama
Principal royalty interests in mineral properties
Cost	372,105	318,001
Net	372,105	318,001
Development stage royalty interests | Mt. Milligan
Principal royalty interests in mineral properties
Cost	227,596
Net	227,596
Exploration stage royalty interests
Principal royalty interests in mineral properties
Cost	201,696	234,683
Net	$ 201,696	$ 234,683