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Formation of Joint Venture (Details)
Jan. 08, 2015
USD ($)
Line of Credit Facility [Line Items]  
Royal Gold percentage of interest 0.00%
royalgoldadditionalinvestment $ 750,000
joint adventure interest retained in the Company 60.00%
ADDITIONAL ECONOMIC INTEREST SELLABLE 20.00%
Royal Gold aggregate amount of investment $ 30,000,000