SEGMENT INFORMATION (Details)	3 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Jun. 30, 2012
Chile
Geographic distribution of royalty revenue and long-lived assets (royalty interests in mineral properties, net)
Royalty Revenue (as a percent)	26.00%	27.00%
Royalty Interests in Mineral Property, net (as a percent)	33.00%		35.00%
Canada
Geographic distribution of royalty revenue and long-lived assets (royalty interests in mineral properties, net)
Royalty Revenue (as a percent)	23.00%	20.00%
Royalty Interests in Mineral Property, net (as a percent)	47.00%		43.00%
Mexico
Geographic distribution of royalty revenue and long-lived assets (royalty interests in mineral properties, net)
Royalty Revenue (as a percent)	22.00%	17.00%
Royalty Interests in Mineral Property, net (as a percent)	8.00%		9.00%
United States
Geographic distribution of royalty revenue and long-lived assets (royalty interests in mineral properties, net)
Royalty Revenue (as a percent)	17.00%	24.00%
Royalty Interests in Mineral Property, net (as a percent)	4.00%		5.00%
Australia
Geographic distribution of royalty revenue and long-lived assets (royalty interests in mineral properties, net)
Royalty Revenue (as a percent)	3.00%	6.00%
Royalty Interests in Mineral Property, net (as a percent)	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%
Royalty Interests in Mineral Property, net (as a percent)	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)	6.00%	2.00%
Royalty Interests in Mineral Property, net (as a percent)	4.00%		4.00%