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Note 11. Derivative Instruments (Tables) | 6 Months Ended
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Jun. 30, 2011
Schedule of Derivative Liabilities at Fair Value [Table Text Block] |
|  | June 30, |  |  | December 31, |
|  | 2011 |  |  | 2010 |
Current derivative contract liabilities |  | $ | 10,510 |  |  | $ | 20,016 |
Other non-current liabilities |  |  | 1,087 |  |  |  | 779 |
Schedule of Derivative Instruments, Gain (Loss) in Statement of Financial Performance [Table Text Block] |
|  | Three Months Ended |  |  | Six Months Ended |
|  | June 30, |  |  | June 30, |
|  | 2011 |  |  | 2010 |  |  | 2011 |  |  | 2010 |
Sales of products |  | $ | 49 |  |  | $ | 6,351 |  |  | $ | 703 |  |  | $ | 6,351 |
Gain (loss) on derivatives contracts |  |  | 558 |  |  |  | 1,999 |  |  |  | (1,475 | ) |  |  | 1,999 |
Schedule of Notional Amounts of Outstanding Derivative Positions [Table Text Block] |
|  | Metric tonnes under contract |  |  | Average price per pound |
|  | Zinc |  |  | Lead |  |  | Zinc |  |  | Lead |
Contracts on provisional sales |  |  |  |  |  |  |  |  |  |  |  |
2011 settlements |  |  | 8,100 |  |  |  | 4,500 |  |  | $ | 1.02 |  |  | $ | 1.17 |
Contracts on forecasted sales |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2011 settlements |  |  | 7,350 |  |  |  | 6,175 |  |  | $ | 0.96 |  |  | $ | 1.01 |
2012 settlements |  |  | 26,650 |  |  |  | 18,000 |  |  | $ | 1.11 |  |  | $ | 1.11 |
2013 settlements |  |  | 4,700 |  |  |  | 8,300 |  |  | $ | 1.16 |  |  | $ | 1.16 |

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- Definition Tabular disclosure of the location and amount of gains and losses reported in the statement of financial performance, or when applicable, the statement of financial position. For example, (a) gains and losses recognized in the income statement on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges and (b) gains and losses initially recognized in other comprehensive income on derivative instruments designated and qualifying as cash flow hedges. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 205G -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5624171-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5618551-113959 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 44C -Subparagraph b -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. + Details
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- Definition Tabular disclosure of the notional amounts of outstanding derivative positions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Topic 815 -SubTopic 10 -Publisher FASB -Number -Article -Subparagraph (d) -Name Accounting Standards Codification -Paragraph 1A -Section 50 -URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5579245-113959 + Details
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