The Total-led Elk-Antelope liquefied natural gas venture in Papua New Guinea has reached a landmark decision on the location of key infrastructure for its proposed multibillion dollar project, leaving the door open for cooperation with ExxonMobil's existing $US19 billion PNG LNG venture. The Elk-Antelope partners, which include InterOil and ASX-listed Oil Search, decided to locate the main gas liquefaction plant at a site adjacent to PNG LNG, at Caution Bay near Port Moresby, That allows for a potential agreement with Exxon on sharing key infrastructure between the two projects, which would reduce costs.