Directors

Elected 2006

Mr. Carrabba served as president and chief executive officer of Cliffs from September 2006 through May 2007, and as Cliffs' president and chief operating officer from May 2005 to September 2006. He previously was president and chief operating officer of Diavik Diamond Mines, Inc., a subsidiary of Rio Tinto plc. from April 2003 to May 2005.

Other Directorships
Newmont Mining Corporation
Capital University
KeyCorp
Great Lakes Science Center

Elected 2005

Senior Vice President of U.S. Gulf of Mexico, Africa and Frontier Region of Noble Energy Inc., an international oil and gas exploration and production company, since May 2013.

Ms. Cunningham served as Senior Vice President of Exploration and Business Innovation from May 2007 to May 2013, Senior Vice President of Exploration and Corporate Reserves from October 2005 to May 2007, and Senior Vice President of Exploration of Noble Energy Inc. from 2001 to 2005.

Elected 2005

Former Managing Director and Chief Executive Officer of Portman Limited, an international iron ore mining company in Australia, from October 2002 through April 2005.

Other Directorships
(ASXListed) Mundo Minerals Limited

Elected 2011

President and Chief Executive Officer of The AES Corporation, one of the world's largest independent power producers with operations in 26 countries.

Mr. Gluski has been employed by AES for nine years and was appointed to his current position in 2007. Prior to that, he served as executive vice president and president, Latin America, and senior vice president of the Caribbean and Central America business. Earlier in his professional career, he held positions at Johnson & Johnson and Procter & Gamble.

Other Directorships
Council of the Americas
U.S.-Spain Business Council
Institute of the Americas at the University of Cal

Elected 2007

Deputy General Counsel, U.S. Congressional Office of Compliance, since November 2007.

Ms. Green served as Aide to Councilmember Nancy Floreen, Montgomery County, Maryland, from December 2002 to August 2005. Ms. Green was originally proposed as a nominee for the Board of Directors by the United Steelworkers, or USW, pursuant to the terms of the 2004 labor agreement.

Elected 2009

Former Senior Vice President (1998-2006), Chief Financial Officer (1994-2005) and Treasurer (2002-06) of Martin Marietta Materials, Inc.

Ms. Henry previously served on the board of Inco Limited, now known as Vale Inco, a wholly owned subsidiary of the second largest mining company in the world, Vale (NYSE: VALE) of Brazil.

Other Directorships
W.R. Grace & Co.

Elected 2010

Former Chairman, President and Chief Executive Officer of Ferro Corporation, a supplier of technology-based performance materials for manufacturers.

Kirsch joined Ferro in 2004 as president and chief operating officer. He became president and chief executive officer in 2005 and added responsibilities as chairman in 2006. Previously, he served as president of Premix Inc. and Quantum Composites, president and a director for Ballard Generation Systems and vice president for Ballard Power Systems. He began his career with The Dow Chemical Company.

Elected 1996

Chairman and Chief Executive Officer of Stillwater Mining Company, a palladium and platinum producer, since February 2001.

Other Directorships
Stillwater Mining Company

Elected 2002

Chief Executive Officer of RKR Asset Management, a consulting organization, since June 2006.

Mr. Riederer served as Chief Executive Officer from January 1996, and President from January 1995 through February 2001, of Weirton Steel Corporation, a steel-producing company. He currently serves on the Board of Trustees of Franciscan University of Steubenville.

Other Directorships
First American Funds
The Boler Company
NFS International
Idea Foundry

Elected 2013

Executive advisor of CCMP Capital Advisors LLC, a private equity firm, since 2012.

Mr. Sullivan served as President, Chief Executive Officer and Director of Bucyrus International Inc. from 2004 until 2011, and President of Bucyrus International Inc. from 2000 to 2004

Other Directorships
Aurora Health Care Inc
Generac Holdings Inc.
Milicron LLC
Northwestern Mutual Life Insurance Company