AGREEMENT AND PLAN OF MERGER by and among BHP BILLITON LIMITED, BHP BILLITON PETROLEUM (NORTH AMERICA) INC., NORTH AMERICA HOLDINGS II INC. and PETROHAWK ENERGY CORPORATION Dated as of July 14, 2011Agreement and Plan of Merger • July 15th, 2011 • BHP Billiton LTD • Metal mining • Delaware
AGREEMENT AND PLAN OF MERGER, dated as of July 14, 2011 (this “Agreement”), among BHP Billiton Limited, a corporation organized under the laws of Victoria, Australia (the “Guarantor”), BHP Billiton Petroleum (North America) Inc., a Delaware corporation and wholly owned subsidiary of the Guarantor (“Parent”), North America Holdings II Inc., a Delaware corporation and a wholly owned Subsidiary of Parent (“Merger Sub”), and Petrohawk Energy Corporation, a Delaware corporation (the “Company,” and together with Parent and Merger Sub, the “Parties”).
