Petrohawk Energy Corp., Houston, (NYSE: HK) plans to acquire additional interests in Elm Grove Field in Bossier and Caddo parishes, Louisiana, from several private sellers for a total purchase price of approximately $169 million. Assets include approximately 83 billion cubic feet gas equivalent proved reserves (35% proved developed; 90% is operated). Net production is approximately 10 million cubic feet gas equivalent per day. Approximately 3,000 net acres are included.