COMMITMENTS AND CONTINGENCIES (Details) $ in Thousands	9 Months Ended
	Mar. 31, 2016 USD ($)
Rainy River
Commitments and Contingencies
Remaining commitment amount	$ 75,000
Wassa and Prestea
Commitments and Contingencies
Remaining commitment amount	70,000
Ilovitza
Commitments and Contingencies
Remaining commitment amount	$ 163,750
Voisey's Bay | Canadian Minerals Partnership
Commitments and Contingencies
Percentage of ownership interest held in Labrador Nickel Royalty Limited Partnership ("LNRLP")	89.99%
Voisey's Bay | Altius
Commitments and Contingencies
Percentage of ownership interest held in Labrador Nickel Royalty Limited Partnership ("LNRLP")	10.00%
Voisey's Bay | Voiseys Bay Holding Corporation
Commitments and Contingencies
Percentage of ownership interest held in Labrador Nickel Royalty Limited Partnership ("LNRLP")	0.01%