SEGMENT INFORMATION (Details)	3 Months Ended		6 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012	Dec. 31, 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)	30.00%	25.00%	28.00%	26.00%
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)	23.00%	28.00%	23.00%	24.00%
Royalty Interests in Mineral Property, net (as a percent)	49.00%		49.00%		43.00%
United States
Geographic distribution of royalty revenue and long-lived assets (royalty interests in mineral properties, net)
Royalty Revenue (as a percent)	19.00%	16.00%	18.00%	20.00%
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)	18.00%	19.00%	20.00%	18.00%
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%	3.00%
Royalty Interests in Mineral Property, net (as a percent)	4.00%		4.00%		4.00%