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Consolidated Statements of Operations (USD $) In Thousands, except Share data, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011
Property and joint venture revenue |  |
Joint venture property payments | $ 300 | $ 242
Costs, expenses and other: |  |
Exploration expense | 1,986 | 5,946
Depreciation and amortization | 61 | 46
General and administrative | 2,680 | 2,857
Loss on derivative instruments | 30 | 137
Property abandonment and impairment | 31 | 10
Gain on sale of assets | (8) |
Interest expense and dividend income (net) | 318 | 163
Total costs, expenses and other | 5,098 | 9,159
Gain on sale of marketable equity securities | 1,528 | 1,937
Loss on warrant liability | (488) |
Equity in net loss of equity method investment | (488) | (623)
Total other income (expense) | 552 | 1,314
Loss before income tax | (4,246) | (7,603)
Income tax benefit (expense) | 648 | 635
Net loss | (3,598) | (6,968)
Less net loss attributable to noncontrolling interest | 301 | 3,591
Net loss attributable to Solitario shareholders | $ (3,297) | $ (3,377)
Loss per common share attributable to Solitario shareholders: |  |
Basic and diluted | $ (0.10) | $ (0.10)
Weighted average shares outstanding: |  |
Basic and diluted | 34,351 | 32,807

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- Definition The adjustment to expense previously capitalized costs of drilling exploratory wells when proved reserves are not found or when the entity obtains information that raises substantial doubt about the economic or operational viability of the project. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 360 -Section 40 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6475089&loc=d3e66584-109467 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 360 -Section 40 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6475089&loc=d3e66610-109467 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 19 -Paragraph 27, 28, 40, 41 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 360 -Section 40 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6475089&loc=d3e66625-109467 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 360 -Section 35 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=6475018&loc=d3e66150-109466 + Details
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