The company estimated "2P" (proved and probable) gas reserves in the Coonarah Gas Field to be in the range of 10.4-13.6 billion cubic feet or 8.7-11.3 petajoules. Eastern Star commissioned the study following the successful drilling of three appraisal wells and re-completion of the existing Coonarah-4 well. With reserves being confirmed as "sufficient", the company is confident of entering into sales contracts with energy consumers in the Narrabi region.