EXHIBIT 21

SUBSIDIARIES OF BUCYRUS INTERNATIONAL INC.

Corporate Name	State/Country of Incorporation
Boonville Mining Services, Inc.	Delaware
Bucyrus (Africa) Surface (Proprietary) Limited	Republic of South Africa
Bucyrus Electrical Service (Proprietary) Limited	Republic of South Africa
Bucyrus Mechanical Service (Proprietary) Limited	Republic of South Africa
Bucyrus America, Inc.	Pennsylvania
Bucyrus Virginia Inc.	Virginia
Bucyrus (Brasil) Ltda.	Brazil
Bucyrus Canada Limited	Ontario
Bucyrus Canada Acquisition, Ltd.	Alberta
O&K Orenstein & Koppel, Inc.	Ontario
Bucyrus Equipamentos de Mineracao Ltda.	Brazil
Bucyrus Equipment, Inc.	Delaware
Bucyrus Field Services, Inc.	Delaware
Bucyrus Mexico, S. de RL. de CV.	Mexico
Bucyrus Services Mexico S. de RL. de CV.	Mexico
Bucyrus Holdings GmbH	Germany
Bucyrus Germany Holdings GmbH	Germany
Bucyrus Europe GmbH	Germany
Bucyrus Africa Underground (Proprietary) Limited	Republic of South Africa
Bucyrus Czech Republic, a.s.	Czech Republic
Bucyrus Europe Holdings, Ltd.	United Kingdom
Bucyrus Europe Limited	United Kingdom
Halco Holdings Limited	United Kingdom
Halco Group Limited	United Kingdom
Halco America, Inc.	Georgia
Halco Directional Drilling Products Limited	United Kingdom
Halco Drilling International Limited	United Kingdom
Halco Drilling (Ireland) Limited	Ireland
HSA Drilling Equipment (Proprietary) Limited	South Africa
White Line Plant Ltd.	United Kingdom

Corporate Name	State/Country of Incorporation
Bucyrus Polska Sp. z o.o.	Poland
000 Bucyrus Service	Russian Federation
Bucyrus UK Limited	United Kingdom
DPM Gesellschaft fur deutsch-polnischen Maschesenhandel und Leasing GmbH	Germany
DBT (Langfang) Mine Technik Co. Ltd.	People’s Republic of China
Tangshan DBT Machinery Co., Ltd.	People’s Republic of China
Bucyrus HEX GmbH	Germany
Bucyrus India Private Limited	India
Bucyrus Industries, Inc.	Delaware
Bucyrus International (Chile) Limitada	Chile
Bucyrus International Hong Kong Limited	Hong Kong
Bucyrus International (Peru) S.A.	Peru
Bucyrus (Mauritius) Limited	Mauritius
Bucyrus Mining Equipment, Inc.	Delaware
Bucyrus MT, Inc.	Delaware
Bucyrus Mexico LLC	Delaware
Equipos de Acuna SA de CV	Mexico
BWC Gear, Inc.	Delaware
BWP Gear Inc.	Delaware
O&K Orenstein & Koppel Limited	United Kingdom
Superior Highwall Holding, Inc.	Delaware
Superior Highwall Miners, Inc.	Delaware
Superior Highwall Miners BV	Netherlands
Western Gear Machinery Co.	Delaware
Equipment Assurance Limited	Cayman Islands
Wisconsin Holdings Pty. Ltd.	Australia
Bucyrus (Australia) Surface Pty. Ltd.	Australia
Bucyrus Australia Underground Holdings Pty. Ltd.	Australia
Bucyrus Australia Underground Pty. Ltd.	Australia
Bucyrus Australia Underground LAD Pty. Ltd.	Australia
Bucyrus Mining Australia Pty. Ltd.	Australia
O&K Australia Pty. Ltd.	Australia