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RESTRUCTURING ON ROYALTY INTERESTS IN MINERAL PROPERTIES (Details) (USD $)
In Thousands, unless otherwise specified
1 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Aug. 31, 2011
Relief Canyon
mile
Jun. 30, 2012
Relief Canyon
Sep. 30, 2011
Relief Canyon
Restructuring on royalty interests in mineral properties          
Royalty rate before reduction pursuant to the Amended and Restated Net Smelter Return Royalty Agreement (as a percent)     4.00%    
Royalty rate pursuant to the Amended and Restated Net Smelter Return Royalty Agreement (as a percent)     2.00%    
Area of interest eliminated pursuant to the Amended and Restated Net Smelter Return Royalty Agreement (in miles)     10    
Restructuring $ 1,328       $ 1,300
Carrying value for royalty interest $ 1,890,988 $ 1,690,439   $ 1,200