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Segment Reporting (Details Narrative) (USD $)
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Segment Reporting [Abstract]    
(1) (5) Exploration other includes loss on unconsolidated subsidiary $ 125,000 $ 313,000
(2) (6) Interest cost capitalized to Mt. Hamilton 153,000 180,000
(2) (6) Depreciation capitalized to Mt. Hamilton 8,000 8,000
(3) (7) Exploration other includes investment in unconsolidated subsidiary 28,000 852,000
(4) (8) Marketable securities included in corporate and other total assets $ 4,210,000 $ 5,683,000