ROYALTY INTERESTS IN MINERAL PROPERTIES (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Jun. 30, 2012
Royalty interests in mineral properties
Cost	$ 2,434,760	$ 2,158,870
Restructuring		(1,328)
Accumulated Depletion	(330,717)	(266,554)
Net	2,104,043	1,890,988
Production stage royalty interests
Royalty interests in mineral properties
Cost	1,105,042	1,090,124
Accumulated Depletion	(330,717)	(266,554)
Net	774,325	823,570
Production stage royalty interests | Andacollo
Royalty interests in mineral properties
Cost	272,998	272,998
Accumulated Depletion	(40,571)	(27,345)
Net	232,427	245,653
Production stage royalty interests | Voisey's Bay
Royalty interests in mineral properties
Cost	150,138	150,138
Accumulated Depletion	(47,761)	(33,192)
Net	102,377	116,946
Production stage royalty interests | Penasquito
Royalty interests in mineral properties
Cost	99,172	99,172
Accumulated Depletion	(11,599)	(9,075)
Net	87,573	90,097
Production stage royalty interests | Las Cruces
Royalty interests in mineral properties
Cost	57,230	57,230
Accumulated Depletion	(10,710)	(6,499)
Net	46,520	50,731
Production stage royalty interests | Mulatos
Royalty interests in mineral properties
Cost	48,092	48,092
Accumulated Depletion	(23,080)	(18,721)
Net	25,012	29,371
Production stage royalty interests | Wolverine
Royalty interests in mineral properties
Cost	45,158	45,158
Accumulated Depletion	(6,346)	(1,625)
Net	38,812	43,533
Production stage royalty interests | Dolores
Royalty interests in mineral properties
Cost	44,878	44,878
Accumulated Depletion	(7,505)	(6,021)
Net	37,373	38,857
Production stage royalty interests | Canadian Malartic
Royalty interests in mineral properties
Cost	38,800	38,800
Accumulated Depletion	(5,688)	(3,292)
Net	33,112	35,508
Production stage royalty interests | Holt
Royalty interests in mineral properties
Cost	34,612	25,428
Accumulated Depletion	(5,679)	(2,980)
Net	28,933	22,448
Production stage royalty interests | Gwalia Deeps
Royalty interests in mineral properties
Cost	31,070	28,119
Accumulated Depletion	(6,219)	(4,398)
Net	24,851	23,721
Production stage royalty interests | Inata
Royalty interests in mineral properties
Cost	24,871	24,871
Accumulated Depletion	(8,636)	(7,320)
Net	16,235	17,551
Production stage royalty interests | Leeville
Royalty interests in mineral properties
Cost	18,322	18,322
Accumulated Depletion	(15,397)	(14,436)
Net	2,925	3,886
Production stage royalty interests | Robinson
Royalty interests in mineral properties
Cost	17,825	17,825
Accumulated Depletion	(10,806)	(9,872)
Net	7,019	7,953
Production stage royalty interests | Cortez
Royalty interests in mineral properties
Cost	10,630	10,630
Accumulated Depletion	(9,705)	(9,673)
Net	925	957
Production stage royalty interests | Other
Royalty interests in mineral properties
Cost	211,246	208,463
Accumulated Depletion	(121,015)	(112,105)
Net	90,231	96,358
Development stage royalty interests
Royalty interests in mineral properties
Cost	1,152,294	868,070
Restructuring		(1,328)
Net	1,152,294	866,742
Development stage royalty interests | Mt. Milligan
Royalty interests in mineral properties
Cost	733,044	455,943
Net	733,044	455,943
Development stage royalty interests | Pascua-Lama
Royalty interests in mineral properties
Cost	372,105	372,105
Net	372,105	372,105
Development stage royalty interests | Other
Royalty interests in mineral properties
Cost	47,145	40,022
Restructuring		(1,328)
Net	47,145	38,694
Exploration stage royalty interests
Royalty interests in mineral properties
Cost	177,424	200,676
Net	$ 177,424	$ 200,676