Bucyrus International (BUCY)

(Registrant’s telephone number, including area code)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):

(Registrant’s telephone number, including area code)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):

Bucyrus International, Inc. (the “Company”) previously announced that, on December 20, 2009, it entered into an Asset and Stock Purchase Agreement, dated as of December 20, 2009 (the “Purchase Agreement”), with Terex Corporation (“Terex”), pursuant to which Terex agreed to sell and the Company agreed to purchase certain assets and liabilities relating to Terex’s mining equipment business (the “Business”). Pursuant to the Purchase Agreement, Terex had the right to request to receive a portion of the purchase price under the Purchase Agreement in the form of shares of the Company’s common stock.

On January 15, 2010, the Company entered into an Equity Agreement (the “Equity Agreement”) with Terex. Subject to the terms and conditions of the Equity Agreement, the Company will issue 5,809,731 shares (the “Consideration Shares”) of the Company’s common stock to Terex in lieu of $300 million of the cash purchase price for the acquisition of the Business. The equity transaction will be completed simultaneously with the closing of the transactions contemplated under the Purchase Agreement.

Upon closing, the Company and Terex will enter into a stockholders agreement with respect to Terex’s rights as a stockholder, including providing for Terex’s commitment to refrain from selling or otherwise transferring its economic interest in the Consideration Shares for an initial holding period of one year from the closing and providing for certain other restrictions, limiting Terex’s ability to acquire additional shares in the Company or to take certain actions to seek to effect a change of control of the Company (or assist others to effect a change of control of the Company). The Company has also agreed to provide registration rights, including one demand registration and a shelf registration to facilitate a sale of the Consideration Shares should Terex wish to sell the Consideration Shares after the initial holding period.

There are no material relationships among the Company and Terex or any of their respective affiliates, other than with respect to the Equity Agreement, the Purchase Agreement and related ancillary agreements.

Pursuant to the Equity Agreement, the Company will issue to Terex 5,809,731 shares of the Company’s common stock. The Company and Terex are relying on Rule 506 of Regulation D, promulgated under the Securities Act of 1933, as amended, to provide an exemption from registration for the issuance of such common stock of the Company to Terex. Pursuant to the Equity Agreement, Terex is the sole purchaser of such common stock and Terex has made representations that support the availability of the exemption from registration provided by Regulation D.

(Registrant’s telephone number, including area code)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):

On October 22, 2009, Bucyrus International, Inc. issued a press release announcing its financial results for the quarter and nine months ended September 30, 2009. A copy of the press release is furnished as Exhibit 99 to this Current Report on Form 8-K.

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SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

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(Registrant’s telephone number, including area code)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

(e) On August 3, 2009, Bucyrus International, Inc. (the “Company”) announced that the employment of Kenneth W. Krueger as the Company’s Chief Operating Officer – Surface had been terminated upon mutual agreement.

On September 3, 2009, the Company entered into a Severance Agreement (the “Agreement”) with Mr. Krueger. Pursuant to the Agreement, Mr. Krueger may remain on the Company’s active payroll through December 31, 2009 at the compensation and benefit level he was receiving prior to the termination of his employment. Mr. Krueger will remain eligible for an annual cash bonus if any such bonus is paid in February 2010 based on the full year 2009 actual results.

On December 31, 2009, assuming Mr. Krueger has remained on active payroll through that date, (i) the Company will fully vest Mr. Krueger’s premium restricted shares included in Mr. Krueger’s 2006 restricted stock grant without regard to whether the performance criteria for such shares have been met, and (ii) any of Mr. Krueger’s stock appreciation rights that would otherwise have vested on such date will vest accordingly. Any of Mr. Krueger’s stock appreciation rights or restricted shares that are unvested after December 31, 2009 will be forfeited.

Commencing on January 1, 2010, the Company will pay Mr. Krueger 14 months of severance at his current monthly base salary level in the form of salary continuation. During the 14 month severance period, Mr. Krueger will be eligible to continue his coverage under the Company’s health, dental and vision insurance plans unless he comes eligible for similar insurance coverage from other sources during the severance period. After the end of such 14-month period, Mr. Krueger will be entitled to continued coverage under COBRA.

The Company will pay to Mr. Krueger his Supplemental Executive Retirement Plan and deferred compensation entitlements on or about July 31, 2010. Additionally, the Company will provide Mr. Krueger with reasonable executive outplacement services at its cost through December 31, 2011.

Pursuant to the Agreement, Mr. Krueger’s Key Executive Employment and Severance Agreement with the Company dated as of August 11, 2008 (the “KEESA”) has been terminated, and any Change of Control of the Company (as defined in the KEESA) that may occur after the date of the Agreement will not trigger any of the otherwise applicable provisions or benefits under the KEESA.

In consideration of the benefits under the Agreement, Mr. Krueger has agreed that until February 28, 2012 he will not assist or work in any capacity, either directly or indirectly, for a designated major competitor of the Company or any subsidiary or affiliate thereof anywhere in the world where such designated major competitor and the Company do business. Mr. Krueger has also signed a release of any claims that he has against the Company.

A copy of the Agreement is filed herewith as Exhibit 10.1 and is incorporated herein by reference.

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SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

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BUCYRUS INTERNATIONAL, INC.

Exhibit Index to Current Report on Form 8-K

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(Registrant’s telephone number, including area code)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

On August 3, 2009, Bucyrus International, Inc. (“Bucyrus” or the “Company”) announced that Kenneth W. Krueger resigned as Chief Operating Officer – Surface Segment of the Company. The Company has no current plans to fill the position.

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SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

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(Registrant’s telephone number, including area code)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):

On July 23, 2009, Bucyrus International, Inc. issued a press release announcing financial results for its second quarter ended June 30, 2009. A copy of the press release is furnished as Exhibit 99 to this Current Report on Form 8-K.

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SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

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(Registrant’s telephone number, including area code)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

(d) The Board of Directors of Bucyrus International, Inc. (the “Company”) elected Deepak T. Kapur effective July 20, 2009 as a new director of the Company as a member of the class of directors whose term expires at the Company’s 2010 Annual Meeting of Stockholders. Mr. Kapur, 56, has served as the President of Navistar Inc.’s Truck Group since September 2003.

In connection with Mr. Kapur’s election to the Board of Directors, he will receive a pro rata portion of the annual $75,000 retainer that is paid in shares of the Company’s common stock pursuant to the Company’s Non-Employee Director Fee Guidelines. Additionally, he will receive a pro rata portion of the annual $55,000 cash retainer that is paid to the Company’s non-employee directors.

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SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

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(Registrant’s telephone number, including area code)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

(d) The Board of Directors of Bucyrus International, Inc. (the “Company”) elected Michelle L. Collins effective July 1, 2009 as a new director of the Company as a member of the class of directors whose term expires at the Company’s 2011 Annual Meeting of Stockholders. In addition, Ms. Collins was appointed to the Audit Committee of the Company’s Board of Directors. Ms. Collins, 49, has served as President for Cambium LLC since September 2007. Ms. Collins is currently a member of the Advisory Board of Svoboda Capital Partners, LLC. Ms. Collins was co-founder of the firm and served as a Managing Director from 1998 through 2006. Ms. Collins also serves as a member of the Board of Directors of Molex Incorporated.

In connection with Ms. Collins’ election to the Board of Directors, she will receive a pro rata portion of the annual $75,000 retainer that is paid in shares of the Company’s common stock pursuant to the Company’s Non-Employee Director Fee Guidelines. Additionally, she will receive a pro rata portion of the annual $55,000 cash retainer that is paid to the Company’s non-employee directors.

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SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

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(Registrant’s Telephone Number, Including Area Code)

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.    Yes  x    No  ¨

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).    Yes  ¨    No  ¨

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company. See the definitions of “large accelerated filer,” “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act.

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).    Yes  ¨    No  x

Indicate the number of shares outstanding of each of the issuer’s classes of common stock, as of the latest practicable date.

Table of Contents

Bucyrus International, Inc.

(Registrant’s telephone number, including area code)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):

On April 23, 2009, Bucyrus International, Inc. issued a press release announcing financial results for its first quarter ended March 31, 2009. A copy of the press release is furnished as Exhibit 99 to this Current Report on Form 8-K.

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SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

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(Registrant’s telephone number, including area code)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):

On February 19, 2009, Bucyrus International, Inc. issued a press release announcing financial results for its fourth quarter and fiscal year ended December 31, 2008. A copy of the press release is furnished as Exhibit 99 to this Current Report on Form 8-K.

(Registrant’s Telephone Number, Including Area Code)

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.    Yes  x    No  ¨

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company. See the definitions of “large accelerated filer,” “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act.

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).    Yes  ¨    No  x

Indicate the number of shares outstanding of each of the issuer’s classes of common stock, as of the latest practicable date.

Table of Contents

Bucyrus International, Inc.

(Registrant’s telephone number, including area code)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):

On October 23, 2008, Bucyrus International, Inc. issued a press release announcing financial results for its third quarter ended September 30, 2008. A copy of the press release is furnished as Exhibit 99 to this Current Report on Form 8-K.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

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BUCYRUS INTERNATIONAL, INC.

Exhibit Index to Current Report on Form 8-K

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