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Segment Reporting - Three Months Ended June 30 2013 Segment Reporting (Details) (USD $) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012
Segment Reporting [Abstract] |  |  |  |
Exploration Expense Mt Hamilton |  | $ 145,000 |  | $ 314,000
Exploration Expense Exploration | 336,000 | 409,000 | 698,000 | 764,000
Exploration Expense Corporate and Other |  |  |  |
Exploration Expense Consolidated | 336,000 | 554,000 | 698,000 | 1,078,000
Interest expense (2) Mt Hamilton |  | 49,000 |  | 102,000
Interest expense (2) Exploration |  |  |  |
Interest expense (2) Corporate and Other |  | 24,000 |  | 39,000
Interest expense (2) Consolidated |  | 73,000 |  | 141,000
Other loss (income (1)(3) Mt Hamilton | 7,000 | 15,000 | 14,000 | 27,000
Other loss (income) (1)(3) Exploration | 438,000 | 388,000 | 789,000 | 700,000
Other loss (income) (1)(3) Corporate and Other | (532,000) | (683,000) | (89,000) | (628,000)
Other loss (income) (1)(3) Consolidated | (87,000) | (280,000) | 714,000 | 99,000
Pre-tax (income) loss Mt Hamilton | 7,000 | 209,000 | 14,000 | 443,000
Pre-tax (income) loss Exploration | 774,000 | 797,000 | 1,487,000 | 1,464,000
Pre-tax (income) loss Corporate and Other | (532,000) | (659,000) | (89,000) | (589,000)
Pre-tax (income) loss Consolidated | $ 249,000 | $ 347,000 | $ 1,412,000 | $ 1,318,000

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