SUBSEQUENT EVENT (Details) $ in Thousands	6 Months Ended
	Dec. 31, 2015 USD ($) oz	Jan. 11, 2016 USD ($)	Jun. 30, 2015 USD ($)
Subsequent event
Mineral Properties, Gross	$ 3,530,294		$ 2,647,976
Phoenix Gold
Subsequent event
Mineral Properties, Gross	$ 75,800
RGLD Gold | Rubicon Minerals Corporation | Phoenix Gold | Initial Royalty
Subsequent event
Gold delivered (in ounces) | oz	135,000
Percentage of royalty interests acquired	6.30%
RGLD Gold | Rubicon Minerals Corporation | Phoenix Gold | Subsequent Royalty
Subsequent event
Percentage of royalty interests acquired	3.15%
Subsequent Events | RGLD Gold | Phoenix Gold
Subsequent event
Security interest on assets		$ 75,000