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Mineral Properties - Exploration Expense (Details) (USD $) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012
Notes to Financial Statements |  |  |  |
Geologic and field expenses | $ 247,000 | $ 334,000 | $ 493,000 | $ 571,000
Administrative | 89,000 | 75,000 | 205,000 | 193,000
Mt. Hamilton exploration and development |  | 145,000 |  | 314,000
Total exploration costs | $ 336,000 | $ 554,000 | $ 698,000 | $ 1,078,000

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