SEGMENT INFORMATION (Details)	3 Months Ended		9 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013	Mar. 31, 2012	Jun. 30, 2012
Chile
Geographic distribution of royalty revenue and long-lived assets (royalty interests in mineral properties, net)
Royalty Revenue (as a percent)	32.00%	25.00%	29.00%	25.00%
Royalty Interests in Mineral Property, net (as a percent)	31.00%		31.00%		35.00%
Canada
Geographic distribution of royalty revenue and long-lived assets (royalty interests in mineral properties, net)
Royalty Revenue (as a percent)	26.00%	25.00%	24.00%	24.00%
Royalty Interests in Mineral Property, net (as a percent)	51.00%		51.00%		43.00%
United States
Geographic distribution of royalty revenue and long-lived assets (royalty interests in mineral properties, net)
Royalty Revenue (as a percent)	15.00%	15.00%	17.00%	18.00%
Royalty Interests in Mineral Property, net (as a percent)	4.00%		4.00%		5.00%
Mexico
Geographic distribution of royalty revenue and long-lived assets (royalty interests in mineral properties, net)
Royalty Revenue (as a percent)	17.00%	23.00%	19.00%	20.00%
Royalty Interests in Mineral Property, net (as a percent)	8.00%		8.00%		9.00%
Australia
Geographic distribution of royalty revenue and long-lived assets (royalty interests in mineral properties, net)
Royalty Revenue (as a percent)	3.00%	5.00%	3.00%	5.00%
Royalty Interests in Mineral Property, net (as a percent)	3.00%		3.00%		3.00%
Africa
Geographic distribution of royalty revenue and long-lived assets (royalty interests in mineral properties, net)
Royalty Revenue (as a percent)	3.00%	4.00%	3.00%	4.00%
Royalty Interests in Mineral Property, net (as a percent)	1.00%		1.00%		1.00%
Other
Geographic distribution of royalty revenue and long-lived assets (royalty interests in mineral properties, net)
Royalty Revenue (as a percent)	4.00%	3.00%	5.00%	4.00%
Royalty Interests in Mineral Property, net (as a percent)	2.00%		2.00%		4.00%