Kosmos Energy Establishes New Exploration Positions in Porcupine Basin, Offshore Ireland

  Kosmos Energy Establishes New Exploration Positions in Porcupine Basin,
  Offshore Ireland

Business Wire

DALLAS -- April 18, 2013

Kosmos Energy Ltd. (“Kosmos”) (NYSE: KOS) announced today that it has entered
into two farm-in agreements, whereby Kosmos is acquiring an interest in
multiple blocks in the prospective Porcupine Basin, offshore the west coast of
Ireland. The farm-in agreements were executed with Antrim Energy Inc.
(“Antrim”) covering Licensing Option 11/5 and with Europa Oil & Gas (Holdings)
plc (“Europa”) covering Licensing Options 11/7 and 11/8.

Per the agreement with Antrim, Kosmos is acquiring a 75 percent participating
interest and operatorship in the approximately 1,410 square kilometer
Licensing Option 11/5 in exchange for carrying the full costs of a planned 3D
seismic program on the block. In addition, the Company will reimburse Antrim
for a portion of previously-incurred exploration costs.

Kosmos is also acquiring an 85 percent participating interest and operatorship
in Licensing Options 11/7 and 11/8, an area totaling 2,000 square kilometers,
in a separate agreement with Europa. According to terms of the agreement,
Kosmos will fully fund a planned 3D seismic program on each block and will
reimburse Europa for a portion of its previously-incurred exploration costs.
Contingent upon an election by Kosmos and Europa to enter into a subsequent
exploration drilling phase on one or both of the blocks, Kosmos will also fund
100 percent of the costs of the first exploration well on each block, subject
to an investment cap. The per-well investment cap for the first well is $90
million on Licensing Option 11/7 and $110 million on Licensing Option 11/8.

Paul Dailly, Senior Vice President and Chief Geoscientist, commented, “The
addition of these highly-prospective blocks offshore Ireland represents
further opportunity to leverage our understanding of Cretaceous-age
combination structural-stratigraphic plays in overlooked and underexplored
basins. With a number of significant leads already identified on 2D, our plans
are to commence 3D seismic acquisition over portions of these deepwater
acreage positions later in 2013, subject to finalizing the areas as Frontier
Exploration Licenses. Combined with our positions offshore Morocco,
Mauritania, and Suriname and onshore Cameroon, we are building out a premier
exploration portfolio and exposing Kosmos to substantial upside exploration
value.”

The completion of the farm-in agreements remains subject to Irish government
approval and other customary closing conditions. Following approval, Kosmos
and co-venturers will pursue converting the Licensing Options to Frontier
Exploration Licenses and seek approval of a work program.

A map of the acreage will be available under the Operations tab at
www.kosmosenergy.com.

About Kosmos Energy

Kosmos Energy is a leading independent oil and gas exploration and production
company focused on frontier and emerging areas along the Atlantic Margin. The
Company’s asset portfolio includes existing production and other major project
developments offshore Ghana, as well as exploration licenses with significant
hydrocarbon potential offshore Ireland, Mauritania, Morocco and Suriname and
onshore Cameroon. Kosmos is listed on the New York Stock Exchange and is
traded under the ticker symbol KOS. For additional information, visit
www.kosmosenergy.com.

Forward-Looking Statements

This press release contains forward-looking statements within the meaning of
Section 27A of the Securities Act of 1933 and Section 21E of the Securities
Exchange Act of 1934. All statements, other than statements of historical
facts, included in this press release that address activities, events or
developments that the Company expects, believes or anticipates will or may
occur in the future are forward-looking statements. The Company’s estimates
and forward-looking statements are mainly based on its current expectations
and estimates of future events and trends, which affect or may affect its
businesses and operations. Although the Company believes that these estimates
and forward-looking statements are based upon reasonable assumptions, they are
subject to several risks and uncertainties and are made in light of
information currently available to the Company. When used in this press
release, the words “anticipate,” “believe,” “intend,” “expect,” “plan,” “will”
or other similar words are intended to identify forward-looking statements.
Such statements are subject to a number of assumptions, risks and
uncertainties, many of which are beyond the control of the Company, which may
cause actual results to differ materially from those implied or expressed by
the forward-looking statements. Further information on such assumptions, risks
and uncertainties is available in the Company’s Securities and Exchange
Commission (“SEC”) filings. The Company’s SEC filings are available on the
Company’s website at www.kosmosenergy.com. Kosmos undertakes no obligation and
does not intend to update or correct these forward-looking statements to
reflect events or circumstances occurring after the date of this press
release, except as required by applicable law. You are cautioned not to place
undue reliance on these forward-looking statements, which speak only as of the
date of this press release. All forward-looking statements are qualified in
their entirety by this cautionary statement.

Contact:

Kosmos Energy Ltd.
Investor Relations
Brad Whitmarsh, +1-214-445-9772
bwhitmarsh@kosmosenergy.com
 
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