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Formation of Joint Venture Company (Details) - USD ($)
 3 Months Ended 21 Months Ended
Sep. 30, 2016
Sep. 30, 2016
Jun. 30, 2016
Jan. 08, 2015
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures $ 0 $ 0 $ 0 $ 1,433,886
Royal Alaska Joint Venture Percentage 15.10% 15.10%    
joint adventure investment       $ 45,700,000
Royal Gold percentage of interest       0.00%
Royal Gold initial investment       $ 5,000,000
joint adventure economic interest       40.00%
Royal Gold aggregate amount of investment       $ 30,000,000
joint adventure interest retained in the Company       60.00%
Investment by Joint Venture Partner $ 2,700,000 $ 13,400,000    
Contango Joint Venture Percentage 0.00% 0.00%   100.00%
royalgoldadditionalinvestment       $ 750,000
ADDITIONAL ECONOMIC INTEREST SELLABLE       20.00%