Drilling Update, Horse Hill-1, Weald Basin UK

24 September 2014 Doriemus plc ("Doriemus" or the "Company") Drilling Update, Horse Hill-1, Weald Basin UK Doriemus Plc (AIM: DOR) is pleased to announce that drilling operations on theHorse Hill-1 well are continuing successfully and the Marriott 50 rig is nowdrilling ahead at a depth of 116 feet measured depth ("MD") today at 12:00hours. Current rate of drill penetration is about 30 feet an hour. The Horse Hill-1 well is located on the northern side of UK Weald Basin nearGatwick Airport and is planned to drill to a Total Depth ("TD") of 8,680 feetMD to test a number of conventional oil and gas targets. The surface casing has been cemented at a depth of 84 feet below ground leveland the well is now being drilled in 17 1/2 -inch hole to the next casing pointat about 1,865 feet MD, where a 13 3/8-inch casing will be installed andcemented before drilling on. The primary oil reservoir targets in this well lie in the Jurassic PortlandSandstone and the Corallian Sandstone. There are also a number of secondary oiltargets in the Jurassic aged formations, including the Great Oolite Limestone.After penetrating the Jurassic, the well will be drilled to TD in order to testfor Triassic aged formations, which are expected to contain gas. Doriemus owns a 10% direct interest in Horse Hill Developments Limited("HHDL"). HHDL is a special purpose company that owns a 65% participating interest andoperatorship of onshore licences PEDL137 and the adjacent licence PEDL 246 inthe UK Weald Basin. The participants in the Horse Hill-1 well are HHDL with a65% working interest and Magellan with a 35% interest. Donald Strang, the Company's Chairman, commented: "HHDL has successfully installed the heavy drilling rig and the well isproceeding towards the first conventional oil objectives in the Jurassic. Asthe well progresses, we look forward to updating the market with anysignificant news." Glossary:MD - measured depthTD - total depth Enquiries: Doriemus plc +44 (0) 20 7440 0640Donald Strang/Hamish Harris Cairn Financial Advisers LLP +44 (0) 20 7148 7900Nominated Adviser and BrokerJames Caithie Square1 Consulting +44 (0) 207 929 5599David BickMark Longson