SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND RECENTLY ADOPTED ACCOUNTING PRONOUNCEMENTS (Details) (USD $)	12 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2011
Asset Impairment
Number of exploration stage royalty interests written down	2
Carrying value of exploration stage royalty interests which are written down	$ 0
Percentage of revenue recognized pursuant to the Robinson royalty agreement	3.00%
Minimum
Geographic distribution of royalty revenue and long-lived assets (royalty interests in mineral properties, net)
Period to compute final true-up sales price payments after concentrate arrives at third-party smelter	1 month
Period for concentrate to arrive at the third-party smelter	4 months
Maximum
Geographic distribution of royalty revenue and long-lived assets (royalty interests in mineral properties, net)
Period to compute final true-up sales price payments after concentrate arrives at third-party smelter	3 months
Period for concentrate to arrive at the third-party smelter	5 months
Chile
Geographic distribution of royalty revenue and long-lived assets (royalty interests in mineral properties, net)
Royalty Revenue (as a percent)	29.00%	25.00%	21.00%
Royalty Interests in Mineral Property, net (as a percent)	30.00%	35.00%	40.00%
Canada
Geographic distribution of royalty revenue and long-lived assets (royalty interests in mineral properties, net)
Royalty Revenue (as a percent)	24.00%	24.00%	19.00%
Royalty Interests in Mineral Property, net (as a percent)	52.00%	43.00%	36.00%
Mexico
Geographic distribution of royalty revenue and long-lived assets (royalty interests in mineral properties, net)
Royalty Revenue (as a percent)	19.00%	20.00%	18.00%
Royalty Interests in Mineral Property, net (as a percent)	7.00%	9.00%	11.00%
United States
Geographic distribution of royalty revenue and long-lived assets (royalty interests in mineral properties, net)
Royalty Revenue (as a percent)	17.00%	18.00%	24.00%
Royalty Interests in Mineral Property, net (as a percent)	4.00%	5.00%	3.00%
Australia
Geographic distribution of royalty revenue and long-lived assets (royalty interests in mineral properties, net)
Royalty Revenue (as a percent)	4.00%	5.00%	5.00%
Royalty Interests in Mineral Property, net (as a percent)	3.00%	3.00%	5.00%
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%	9.00%
Royalty Interests in Mineral Property, net (as a percent)	1.00%	1.00%	2.00%
Other
Geographic distribution of royalty revenue and long-lived assets (royalty interests in mineral properties, net)
Royalty Revenue (as a percent)	4.00%	4.00%	4.00%
Royalty Interests in Mineral Property, net (as a percent)	3.00%	4.00%	3.00%