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Consolidated Statements of Operations (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Costs, expenses and other:    
Exploration expense $ 524 $ 841
Depreciation and amortization 14 11
General and administrative 671 956
Gain on derivative instruments (66) (54)
Interest expense 68 92
Interest and dividend income (8) (50)
Gain on sale of assets (9)   
Total costs, expenses and other 1,194 1,796
Other Income    
Gain on sale of marketable equity securities 332 1,568
Net loss of equity method investment (109) (221)
Total other income 223 1,347
Loss before income taxes (971) (449)
Income tax benefit (expense) 109 (245)
Net loss (862) (694)
Less net loss attributable to non-controlling interest 192 533
Net loss attributable to Solitario shareholders $ (670) $ (161)
Loss per common share attributable to Solitario shareholders:    
Basic and diluted $ (0.02) $ (0.01)
Weighted average shares outstanding:    
Basic and diluted 34,226 29,769