DOR Doriemus

3 September 2014

                                 Doriemus plc

                         ("Doriemus" or the "Company")

                        Drilling Commence at Horse Hill

Doriemus Plc (AIM: DOR) is pleased to announce that drilling operations on the
Horse Hill-1 well have now commenced.

The Horse Hill-1 well is planned to be drilled to a Total Depth ("TD") of 2,646
metres (8,680 feet) and is designed to test for a number of conventional
stacked oil targets in the Jurassic, as well as a deeper conventional gas
target in the Triassic.

The operator, Horse Hill Developments Ltd ("HHDL"), is a special purpose
company with a 65% operating interest in the PEDL 137 license in the Weald
Basin to the north of Gatwick Airport in Surrey. Doriemus has binding
agreements in place to own a direct 10% interest in HHDL.

The participants in the Horse Hill Prospect are HHDL (65%) and Magellan
Petroleum Corporation (35%).

Donald Strang, the Company's Chairman, commented:

"This is an exciting time for Doriemus. We are very pleased that drilling
operations are now underway on this exciting prospect. The next few weeks will
be a busy and interesting phase for this investment."

Enquiries:

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

Cairn Financial Advisers LLP            +44 (0) 20 7148 7900
Nominated Adviser and Broker
James Caithie/Jo Turner/Carolyn Sansom


About Horse Hill:

The 99.29 km2 (24,525 acre) Horse Hill Petroleum Exploration and Development
Licence No. 137 (PEDL 137) ("Horse Hill") is located in Surrey, a few miles
from Gatwick Airport

The Horse Hill Prospect OOIP and OGIP and prospective resources, as previously
announced by the Company, are summarised in Table 1.

Table 1: Horse Hill Prospect estimated OOIP, OGIP and Prospective Resources.

   Target Reservoir            OOIP               OOIP          Prospective
                                                                 Resources
         Oil             Upside Potential     Mean (MMSTB)
                              (MMSTB)                          Mean (MMSTB )

Upper Portland                  116                57               17
Sandstone

Lower Portland                  284               147               44
Sandstone

Corallian Sandstone             67                 33               10

Greater Oolite                  204               104               16
Limestone

Total Oil                       671               341               87

   Target Reservoir            OGIP               OGIP          Prospective
                                                                 Resources
         Gas             Upside Potential      Mean (Bcf)
                               (Bcf)                            Mean (Bcf)

Triassic Sandstone              456               234               164

Glossary:

MMSTB million stock barrels

Bcf billion cubic feet

OOIP Original Oil in Place

OGIP Original Gas in Place

Prospective Resource Prospective resources are estimated volumes associated
with undiscovered accumulations. These represent quantities of petroleum which
are estimated, as of a given date, to be potentially recoverable from oil and
gas deposits identified on the basis of indirect evidence but which have not
yet been drilled. This class represents a higher risk than contingent resources
since the risk of discovery is also added. For prospective resources to become
classified as contingent resources, hydrocarbons must be discovered, the
accumulations must be further evaluated and an estimate of quantities that
would be recoverable under appropriate development projects prepared.