13 May 2015



                                 Doriemus plc

                         ("Doriemus" or the "Company")

                 Horse Hill Licence Extensions, UK Weald Basin

The Board of Dorimeus plc (AIM: DOR) is pleased to announce that it has been
informed by Horse Hill Developments Ltd ("HHDL") that the exploration stage of
the Horse Hill ("HH") PEDL137 licence, in which the Company has net
attributable interest of 6.5%, has been extended for a further year by the Oil
& Gas Authority ("OGA", formerly the Department of Energy and Climate Change).
The exploration stage of the PEDL137 licence has been extended to 30 September
2016.

Subject to the results of an intended Horse Hill-1 ("HH-1") flow test later in
2015, for which regulatory approval is required, the Company is informed that
HHDL would seek, in conjunction with the OGA and other regulators, to move the
PEDL137 licence into the Production Period, via, inter alia, the submission of
a HH Field Development Plan ("FDP") to the OGA. The PEDL137 licence provides
for a potential Production Period of 19 years. HHDL has informed the Company
that its application for the flow test is based on the roadmap document
published by the Department of Energy and Climate Change (now the OGA) for
onshore oil and gas exploration in the UK.

Dorimeus' interest in Horse Hill:

The Horse Hill-1 well is located within onshore exploration License PEDL137, on
the northern side of the Weald Basin near Gatwick Airport. Doriemus owns a 10%
direct interest in Horse Hill Developments Ltd. HHDL is a special purpose
company that owns 65% participating interests and is the operator of licence
PEDL137 and the adjacent licence PEDL246 in the UK Weald Basin. The remaining
35% participating interests in the PEDL137 and PEDL246 licenses are held by
Magellan Petroleum Corporation.

Doriemuslicence interests

Following the extensions to the exploration stages of PEDL137 and PEDL126, the
Company has interests in the following Horse Hill oil & gas licences:

Asset  Licence    Licence      Doriemus'     Operator or   Area     Current
                  Holder       Economic     Non-Operator   (km2) Licence Period
                               Interest                              Expiry

Horse  PEDL137  Horse Hill       6.5%       Non-Operator   99.29  30 September
Hill 1         Developments                   (HHDL is                2016
                    Ltd                       Operator)

Horse  PEDL246  Horse Hill       6.5%       Non-Operator   43.58  30 June 2019
Hill 1         Developments                   (HHDL is
                    Ltd                       Operator)

Notes

1 Exploration licence. UK exploration licences provide for the extension beyond
the exploration stage into a production period, subject to meeting certain
criteria, approval by the relevant authorities and, inter alia, the submission
of an FDP to the OGA. Production Periods are typically for 20 years from grant
of approval.

For further information please contact:

Doriemus plc
Donald Strang/Hamish Harris                  +44 (0) 20 7440 0640

Cairn Financial Advisers LLP:
James Caithie / Carolyn Sansom               +44 (0) 20 7148 7900

Public Relations:
Square 1 Consulting Ltd                      +44 (0) 20 7929 5599
David Bick/Mark Longson