Melrose Resources said it has received approval from the Bulgarian government to develop the Kavarna gas field, which contains estimated reserves of 24 billion cubic feet.The group said it has also formally received approval from the Romanian National Agency of Mineral Resources to conduct petroleum operations in the country under new administrative guidelines.'The receipt of the Certificate of Commerciality for the Kavarna field from the new Bulgarian government administration is an important milestone,' said chief executive David Thomas.'We now look forward to accelerating the development of our various projects in Bulgaria and Romania which will contribute significantly to the regional domestic gas supply.'