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MIneral Property - Mineral Property Lease Modification (Details) (USD $)
Jun. 01, 2016
Jun. 01, 2015
Jun. 01, 2014
Jun. 01, 2013
Notes to Financial Statements        
Solitario common stock shares    66,500 35,000 35,000
Target value of Solitario shares (3)(4)    $ 95,000 $ 50,000 $ 50,000
Cash 190,000 75,000 50,000 50,000
Minimum lease payment value 190,000 170,000 100,000 100,000
Annual work commitments $ 150,000