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STREAM AND ROYALTY INTERESTS, NET - Impairments (Details) - USD ($)
$ in Thousands
12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Impairments of royalty and stream interests   $ 239,364
Value of stream and royalty interests, net $ 2,339,316 2,501,117
Royalty interests    
Impairments of royalty and stream interests   239,364
Pascua-Lama    
Copper NSR (as a percent) 1.09%  
Value of stream and royalty interests, net $ 177,700  
Pascua-Lama | Minimum    
Net smelter return (NSR) (as a percent) 0.78%  
Pascua-Lama | Maximum    
Net smelter return (NSR) (as a percent) 5.45%  
Pascua-Lama | Royalty interests    
Impairments of royalty and stream interests   239,080
Other | Royalty interests    
Impairments of royalty and stream interests   $ 284
El Toqui    
Value of stream and royalty interests, net $ 1,400