Drilling Update, Horse Hill-1, Weald Basin UK

29 September 2014 Doriemus plc ("Doriemus" or the "Company") Drilling Update, Horse Hill-1, Weald Basin UK Doriemus Plc (AIM: DOR) today advises that the Horse Hill-1 well has now beendrilled to the second casing point at 1,795 feet measured depth ("MD"), and thesetting and cementing of a 13 3/8-inch steel casing is now underway. The bottomof the well is currently located in the upper part of the Jurassic and the wellhas encountered the expected mud gas up to C3 (propane) and mineralfluorescence just above current well depth. Geological analysis and mud logging from rock cuttings circulated out of thehole indicate that geological markers in the well are slightly shallower thaninitially prognosed based on seismic and the nearby Collendean - 1 well drilledby ESSO in 1964. The second casing point has been revised up from 1,865 feet MDto reflect this. 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 feetmeasured depth ("MD") to test a number of conventional oil and gas targets. The primary oil reservoir targets in this well lie in the Jurassic PortlandSandstone at about 2,200 feet true vertical depth below sea level ("TVD ss")and the Corallian Sandstone at about 3,440 feet TVD ss. There are also a numberof secondary oil targets in the Jurassic aged formations, including the GreatOolite Limestone, estimated to be at 4,530 feet TVD ss. After setting the 13 3/8-inch casing, a 12 ½-inch hole will be drilled to adepth of approximately 5,900 feet MD where open-hole electric logs will beacquired through the prognosed oil reservoirs before setting a 9 5/8-inchcasing. Then an 8 ½-inch hole will be drilled to TD in order to test forTriassic aged formations, which are expected to contain gas. Doriemus owns a 10% direct interest in Horse Hill Developments Ltd ("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: "We are pleased to see encouraging progress on this well and that the operatoris now setting the second casing in a good seal just above the first of theprimary targets in the Portland." Glossary: up to C3 (propane) - hydrocarbon gas liquids from spectrometry showing thepresence of C1 (methane), C2 (ethane) and C3 (propane) MD - measured depth mineral florescence - light emitted by natural minerals showing, in somecircumstances, the presence of hydrocarbons mud gas - gases recovered from the drilling fluids (mud) TD - total depth TVD ss - true vertical depth below sea level For further additional information please contact: 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