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Note 4. Commitments, Contingencies and Obligations (Detail) (USD $) | 1 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Oct. 31, 2012 | Feb. 29, 2012 | Jun. 30, 2011 | Jan. 31, 2010 | Apr. 30, 2009 | Sep. 30, 2012 | Jun. 30, 2012 | Oct. 31, 2011
Maximum Environmental Remediation Obligation |  |  |  |  |  | $ 2,500,000 |  |
AdministrativePenalty |  |  |  |  | 177,500 |  |  |
Payments to Acquire Land |  | 1,875,000 |  |  |  |  |  |
EstimatedResponseCosts |  |  | 4,500,000 |  |  |  |  |
EstimatedFutureResponseCost |  |  | 100,000,000 | 72,000,000 |  |  |  |
IncurredResponseCosts |  |  |  | 91,000,000 |  |  |  |
Noncapital Costs |  |  |  |  |  | 25,000,000 |  |
Commitments for Capital Lease Payments |  |  |  |  |  | 15,500,000 |  |
Payments for Environmental Liabilities | 25,000,000 |  |  |  |  |  |  |
Environmental Litigation and Related Claims |  |  |  |  |  | 70,500,000 |  |
Annual Maintenance Fee |  |  |  |  |  |  |  | 600,000
Letters of Credit Outstanding, Amount |  |  |  |  |  | 600,000 |  |
United Steel Workers Claims Lower Range |  |  |  |  |  |  | 0 |
UnitedSteelWorkersClaimsUpperRange |  |  |  |  |  |  | 10,000,000 |
Lucky Friday [Member] |  |  |  |  |  |  |  |
Contractual Obligations |  |  |  |  |  | 11,100,000 |  |
Greens Creek [Member] |  |  |  |  |  |  |  |
Contractual Obligations |  |  |  |  |  | 200,000 |  |
Barker-Hughesville Site [Member] |  |  |  |  |  |  |  |
ContributionAndCostRecovery |  |  |  |  |  | 9,000,000 |  |
Black Pine Mine Site [Member] |  |  |  |  |  |  |  |
ContributionAndCostRecovery |  |  |  |  |  | 17,700,000 |  |
Van Stone Mine Site [Member] |  |  |  |  |  |  |  |
ContributionAndCostRecovery |  |  |  |  |  | 3,500,000 |  |
Greens Creek [Member] |  |  |  |  |  |  |  |
Noncapital Costs |  |  |  |  |  | 600,000 |  |
Environmental Protection Agency [Member] |  |  |  |  |  |  |  |
Other Accrued Liabilities, Noncurrent |  |  |  |  |  | 1,100,000 |  |
Estimated Past Costs And Investigation And Planning Costs [Member] |  |  |  |  |  |  |  |
Other Accrued Liabilities, Noncurrent |  |  |  |  |  | 1,400,000 |  |
Greens Creek [Member] |  |  |  |  |  |  |  |
Open Purchase Orders |  |  |  |  |  | 10,700,000 |  |
Lucky Friday [Member] |  |  |  |  |  |  |  |
Open Purchase Orders |  |  |  |  |  | $ 1,400,000 |  |

X
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- Definition Cash outflows made during the period for environmental remediation activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 -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 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 17 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3367-108585 + Details
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