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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