MAJOR SOURCES OF REVENUE (Details) - Royalty revenue - Concentration of risk by operator - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2013
Thompson Creek Metals Company Inc
Major sources of revenue
Revenue	$ 94,104	$ 27,209
Percentage of total revenue	33.80%	11.50%
Teck
Major sources of revenue
Revenue	$ 38,033	$ 48,777	$ 82,272
Percentage of total revenue	13.70%	20.60%	28.40%
Goldcorp, Inc
Major sources of revenue
Revenue	$ 32,117	$ 32,339	$ 32,461
Percentage of total revenue	11.60%	13.60%	11.20%
Vale Newfoundland & Labrador Limited
Major sources of revenue
Revenue	$ 16,665	$ 25,128	$ 32,517
Percentage of total revenue	6.00%	10.60%	11.20%