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RELATED PARTY (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Jun. 30, 2011
ounces
Jun. 30, 2010
ounces
Related party    
Maximum period of days gold inventory allocated to Royal Gold in an in-kind distribution will be held before sale (in days) 5  
Crescent Valley Partners, L.P.
   
Related party    
Percentage of royalty interests acquired (as a percent) 1.25%  
General partner ownership percentage held by Denver Mining Finance Company (as a percent) 2.00%  
Limited partner ownership percentage held by Royal Gold (as a percent) 29.60%  
Number of other member of board of directors holding limited partner interests 1  
Aggregate percentage of limited partner interests held by certain Royal Gold's executives (as a percent) 35.56%  
Quantity of gold inventories (in ounces) 15,255 18,067
Carrying value of the gold in inventory $ 8.1 $ 8.7
Fair value of the gold in inventory $ 23.0 $ 22.5