RESTRUCTURING ON ROYALTY INTERESTS IN MINERAL PROPERTIES (Details) (USD $) In Thousands, unless otherwise specified	1 Months Ended	12 Months Ended
	Aug. 31, 2011 mi	Jun. 30, 2013	Jun. 30, 2012
Restructuring on royalty interests in mineral properties
Impairment charges			$ (1,328)
Carrying value for royalty interest		2,120,268	1,890,988
Relief Canyon
Restructuring on royalty interests in mineral properties
Royalty rate before reduction pursuant to the Amended and Restated Net Smelter Return Royalty Agreement (as a percent)	4.00%
Royalty rate pursuant to the Amended and Restated Net Smelter Return Royalty Agreement (as a percent)	2.00%
Area of interest eliminated pursuant to the Amended and Restated Net Smelter Return Royalty Agreement (in miles)	10
Impairment charges		0	1,300
Carrying value for royalty interest		$ 1,200	$ 1,200