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MIneral Property - Mineral Property Lease Modification (Details) (USD $) | Jun. 01, 2016 | Jun. 01, 2015 | Jun. 01, 2014 | Jun. 01, 2013
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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 |  |  |

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