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|EXHIBIT 31.2                                                                                                             
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|CERTIFICATION OF CHIEF FINANCIAL OFFICER, CONTROLLER AND 
    SECRETARY PURSUANT TO SECTION 302 OF THE SARBANES-OXLEY ACT
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|I, Craig R. Mackus, certify that:                                                                                        
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|1. | I have reviewed this quarterly report on Form 10-Q of Bucyrus International, Inc.                                                                                                                                                                                                                                             
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|2. | Based on my knowledge, this quarterly report does not contain any untrue statement of a material fact
or omit to state a material fact necessary to make the statements made, in light of the circumstances
under which such statements were made, not misleading with respect to the period covered by this
quarterly report;
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|3. | Based on my knowledge, the financial statements, and other financial information included in this quarterly
report, fairly present in all material respects the financial condition, results of operations and
cash flows of the registrant as of, and for, the periods presented in this quarterly report;                   
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|4. | The registrants other certifying officer and I are responsible for establishing and maintaining
disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) for
the registrant and we have:                                                                                                
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| | a) | Designed such disclosure controls and procedures, or caused such disclosure controls and procedures
to be designed under our supervision, to ensure that material information relating to the registrant,
including its consolidated subsidiaries, is made known to us by others within those entities, particularly
during the period in which this quarterly report is being prepared;
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| | b) | Evaluated the effectiveness of the registrants disclosure controls and procedures and presented
in this report our conclusions about the effectiveness of the disclosure controls and procedures,
as of the end of the period covered by this report based on such evaluation; and                                                                                                     
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| | c) | Disclosed in this report any change in the registrants internal control over financial reporting
that occurred during the registrants most recent fiscal quarter that has materially affected,
or is reasonably likely to materially affect, the registrants internal control over financial
reporting; and                                                                          

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|5. | The registrants other certifying officer and I have disclosed, based on our most recent evaluation
of internal control over financial reporting, to the registrants auditors and the audit committee
of registrants board of directors (or persons performing the equivalent function):
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| | a) | all significant deficiencies and material weaknesses in the design or operation of internal control
over financial reporting which are reasonably likely to adversely affect the registrants ability
to record, process, summarize and report financial information; and
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| | b) | any fraud, whether or not material, that involves management or other employees who have significant
role in the registrants internal control over financial reporting.                                                                                                 

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|Date:    May 10, 2005 |                                                                        
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|                      | /s/ C. R. Mackus                                                       
|                      |                                                                        
|                      | Craig R. Mackus
      Chief Financial Officer,
Controller and Secretary

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