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Note 16. Acquisitions | 12 Months Ended
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Dec. 31, 2011
Business Combination Disclosure [Text Block] | Note 16: Acquisitions San Juan Silver Mining Joint Venture 30% Acquisition On December 12, 2011, we announced that our wholly-owned subsidiary, Rio Grande Silver Inc. (“Rio”), entered into a Purchase Sale Agreement with Emerald Mining & Leasing, LLC ("EML"), Golden 8 Mining, LLC ("G8"), and AgX Resources, Inc. ("AgX"), (EML, G8, and AgX are collectively referred to as the "Sellers"). Under the terms of the Agreement, Rio purchased the sellers' remaining 30% undivided interest in certain properties that had been governed by a Joint Venture Agreement ("2008 JVA") entered into between EML, G8, and Rio on February 21, 2008, in return for the issuance of 5,395,683 shares of Hecla common stock valued at $30 million. The number of common shares issued, 5,395,683, was based on 90% of the volume-weighted average price of Hecla Mining Company shares on the New York Stock Exchange for the 20 trading days immediately preceding and including December 2, 2011. The shares had a value of approximately $33.8 million on the date that the transaction was completed. The original 2008 JVA between EML, G8, and Rio was terminated and a new Joint Venture Agreement for the exploration, evaluation and possible development and mining of mineral resources on certain properties in Mineral County, Colorado was entered into. EML, G8, and Rio will manage and operate under the name San Juan Silver Mining Joint Venture (the "Venture"), and Rio will be the initial operator.

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- Definition The entire disclosure for a business combination (or series of individually immaterial business combinations) completed during the period, including background, timing, and recognized assets and liabilities. The disclosure may include leverage buyout transactions (as applicable). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141 -Paragraph 51, 52 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 805 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6909870&loc=d3e1500-128463 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6911361&loc=d3e7000-128479 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6911361&loc=d3e6927-128479 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6911361&loc=d3e7008-128479 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6909870&loc=d3e1490-128463 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6911361&loc=d3e6996-128479 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6910749&loc=d3e4922-128472 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6910749&loc=d3e4934-128472 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141R -Appendix F -Paragraph F4 -Subparagraph e Reference 11: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6910749&loc=d3e4926-128472 Reference 12: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6909870&loc=d3e1383-128463 Reference 13: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6909870&loc=d3e1392-128463 Reference 14: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6909870&loc=d3e1497-128463 Reference 15: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141R -Paragraph 67-73 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. 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