DOR Doriemus

4 April 2017

Doriemus Plc

(“Doriemus” or the “Company”)

OGA Extends Retention Area Period for Horse Hill Licences, Weald Basin, SE UK

Doriemus (NEX: DOR) is pleased to announce that it has been informed by the operator, Horse Hill Developments Limited (“HHDL”), that the Oil and Gas Authority (“OGA”) has consented to extend the current PEDL137 and PEDL246 Retention Areas (“RAs”) until 2021. The PEDL137 and PEDL246 RAs, which cover the entirety of the licences, will now expire on 30 September 2021 and 30 June 2021, respectively. The Company owns 10% of HHDL, which owns 65% of the Horse Hill Licences which hosts the HH-1 oil discovery well, or a 6% attributable interest in the licences.

The RAs work programmes, now agreed with the OGA, comprise; the planned Horse Hill-1 (“HH-1”) Kimmeridge and Portland production tests, HH-1z Kimmeridge Limestone (“KL”) and HH-2 Portland appraisal wells, 50 km² of 3D seismic, 25 km of 2D seismic and a PEDL246 exploration step-out well. The RAs for each licence can be further extended or modified subject to an ongoing minimum work programme agreed by the OGA.

David Lenigas, Chairman of the Company commented:

‘’We are very pleased to have received confirmation of this notification from the OGA, through the operator, HHDL. The matter represents another significant step in the journey from discovery to production. There is no doubt in my mind that the Wealden area is developing into a significant natural resources oil play and we are pleased to be one of the joint venture partners pursuing the exploitation of one of our Country’s significant natural resources’’.

 HH-1 Oil Discovery

The HH-1 Kimmeridge Limestone and Portland oil discovery well is located within onshore exploration Licence PEDL137, on the northern side of the Weald Basin, 3 km north of Gatwick Airport. As previously reported in February and March 2016, two naturally-fractured limestone members within the Kimmeridge section, known as KL3 and KL4, flowed dry, 40-degree API oil, at an aggregate stabilised natural flow rate of 1,365 barrels per day (“bopd”) with no clear indication of depletion. The overlying Portland flowed dry, 35-37 API gravity crude at a stable pumped rate of 323 bopd. The Portland oil was produced at the rod-pump’s maximum achievable rate and thus flow was constrained by the pump’s mechanical capacity.

As previously reported in October 2016, an application for long term production testing and further appraisal drilling was submitted to Surrey County Council in October 2016, and is now scheduled to be decided at the Council’s planning committee meeting in July 2017. The Company therefore envisages that these operations will commence in the second half of 2017 upon grant of the necessary remaining regulatory permissions.

Qualified Person's Statement

Stephen Sanderson stated: "The revised RA expiry dates ensure that the knowledge gained from the forthcoming extensive 2017 Broadford Bridge, Horse Hill and Holmwood drilling and test campaign, can be fully incorporated into future Kimmeridge Limestone step-out wells in PEDL246 and PEDL137. 2017 is set to become a pivotal year for the Company."

The directors of Doriemus accept responsibility for this announcement

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