COMMITMENTS AND CONTINGENCIES (Details) $ in Millions	3 Months Ended
	Sep. 30, 2015 USD ($)
Rainy River
Commitments and Contingencies
Remaining commitment amount	$ 75.0
Wassa, Bogoso and Prestea
Commitments and Contingencies
Remaining commitment amount	75.0
Ilovitza
Commitments and Contingencies
Remaining commitment amount	$ 167.5
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%