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Commitments and Contingencies (Details Narrative) (USD $) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Oct. 31, 2015
Commitments and contingencies |  |  |  |
Estimated property rentals and option payments | $ 1,040,000 |  |  |
Portion estimated to be mineral property payments | 294,000 |  |  |
Portion estimated to be reimbursable by joint venture partners | 694,000 |  |  |
Office rent expense |  | 72,000 | 61,000 |
Office lease minimum rent payments |  |  |  | $ 47,000

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