UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

~~FORM~~Form 8-K

~~CURRENT~~Current ~~REPORT~~Report

Pursuant to Section 13 or 15(d) of the

Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): May 1920, 2011

Bucyrus International, Inc.

(Exact name of registrant as specified in its charter)

Delaware		001-00871		39-0188050
(State or other jurisdiction of incorporation)		(Commission File Number)		(IRS Employer Identification No.)

001-00871

(Commission File Number)

Delaware

39-0188050

(State or other jurisdiction

of incorporation)

(I.R.S. Employer

Identification No.)

P.O. Box 500, 1100 Milwaukee Avenue,

South Milwaukee, Wisconsin 53172

(Address of principal executive offices, ~~including~~with ~~ZIP~~zip code)

(414) 768-4000

(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):

¨ Written communications pursuant to Rule 425 under the Securities Act (17 ~~C.F.R.~~CFR §230.425)

¨ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 ~~C.F.R.~~CFR §240.14a-12)

¨ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 ~~C.F.R.~~CFR §240.14d-2(b))

¨ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 ~~C.F.R.~~CFR §240.13e-4(c))

Item 78.01. ~~Regulation~~Other ~~FD Disclosure~~Events.

On May 1920, 2011, Bucyrus International, Inc. (the “Company”) issued a press release announcing the Company has ~~issued~~received ~~its~~notification ~~2010~~from ~~Sustainability~~the ~~Report. A~~United ~~copy~~States Department of ~~the~~Justice ~~press~~(DOJ) ~~release~~that isit ~~furnished~~has asclosed ~~Exhibit 99~~its toinvestigation ~~this~~into ~~Current~~Caterpillar’s ~~Report~~planned acquisition onof ~~Form~~Bucyrus ~~8-K~~International, Inc.

~~Item~~The ~~9.01.~~press ~~Financial~~release ~~Statements~~is filed herewith as Exhibit 99.1 and ~~Exhibits~~incorporated by reference herein.

~~(d) Exhibits~~Item 9.01 ~~The~~Financial ~~following~~Statements ~~exhibit~~and ~~is being furnished herewith:~~ Exhibits.

ExhibitNumber		Description
99.1		Bucyrus International, Inc. press release dated May 19, 2011.

(d)

Exhibits.

The following exhibits are filed herewith:


Exhibit Number		Description

99.1		Joint press release of Caterpillar Inc. and Bucyrus International, Inc. dated May 20, 2011.

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~~SIGNATURES~~SIGNATURE

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.

	BUCYRUS INTERNATIONAL, INC.
Date: May 20, 2011	BUCYRUS INTERNATIONAL, INC.
Dated: May 19, 2011	By:	/s/ Craig R. Mackus
	By:	/s/ Craig R. Mackus
	Name:	Craig R. Mackus
		Craig R. Mackus Chief Financial Officer and Secretary
	Title:	Chief Financial Officer and Secretary

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