b'Senegal covers an area within both the C8 and Saint-Louis Offshore Profond Blocks. Mauritania andSenegal agreed that the Greater Tortue Ahmeyim Field would be unitized for optimal resourcerecovery in the Inter-State Cooperation Agreement (ICA) signed in February 2018. The GTA UUOAwas agreed between the contractor groups of the C8 and Saint-Louis Offshore Profond Blocks andapproved by the appropriate Ministers in Mauritania and Senegal in February 2019. BP Mauritania andBP Senegal are co-Unit Operator, and will allocate responsibilities for the initial development of theGreater Tortue Ahmeyim Field. The Greater Tortue Ahmeyim Unit holders interests are subject toredetermination in accordance with the terms of the GTA UUOA. Although the Greater TortueAhmeyim Field is unitized, Kosmos participating interests in each block outside the boundary of theGreater Tortue Ahmeyim Unit remain the same. Our Unit interest is 29%, subject to SMHPMs rightto elect to participate for up to 14% in Block C8 and PETROSENs right to increase its participatinginterest to 20% in the Saint-Louis Offshore Profond Block and subject to redetermination of theparticipating interests pursuant to the terms of the GTA UUOA. In February 2019, Mauritania andSenegal each issued an exploitation authorization for the Greater Tortue Ahmeyim Unit area coveredby the GTA UUOA.Mauritania AgreementsEffective June 2012, we entered into three petroleum contracts covering offshore Mauritaniablocks C8, C12 and C13 with the Islamic Republic of Mauritania. We provide technical explorationservices to BP, the operator. The Mauritanian national oil company, SMHPM, currently has a 10%carried participating interest during the exploration period only. Should a commercial discovery bemade, SMHPMs 10% carried interest is extinguished and SMHPM will have an option to acquire aparticipating interest between 10% and 14%. SMHPM will pay its portion of development andproduction costs in a commercial development. Cost recovery oil is apportioned to the contractor fromup to 55% of total production prior to profit oil being split between the government of Mauritania andthe contractor. Profit oil is then apportioned based upon R-factor tranches, where the R-factor iscumulative net revenues divided by the cumulative investment. At the election of the government ofMauritania, the government may receive its share of production in cash or in kind. A corporate tax rateof 27% is applied to profits at the license level. The terms of exploration periods of these OffshoreBlocks are all ten years and include an initial exploration period of four years followed by the firstextension period of three years and the second extension period of three years. Kosmos is currently inthe first extension period of the blocks, expiring in June 2019. In the event of commercial success, wehave the right to develop and produce oil for 25 years and gas for 30 years from the grant of anexploitation authorization from the government, which may be extended for an additional period of10 years under certain circumstances.In October 2016, we entered into a petroleum contract covering Block C6 with the IslamicRepublic of Mauritania. As a result of a subsequent farm-out, we have a 28% participating interest andprovide technical exploration services to BP, the operator. The Mauritanian national oil company,SMHPM, currently has a 10% carried participating interest during the exploration period. We arecurrently in the first exploration period, which extends four years from the effective date (October 28,2016).In September 2017, we acquired a 15% non-operated participating interest in Block C18 offshoreMauritania. SMHPM currently has a 10% carried participating interest during the exploration period.Should a commercial discovery be made, SMHPMs 10% carried interest is extinguished and SMHPMwill have an option to acquire a participating interest between 10% and 15%. SMHPM will pay itsportion of development and production costs in a commercial development. The terms of explorationperiods are ten years and include an initial exploration period of seven years from the effective date(June 15, 2012), including extensions received prior to our entry into Block 18. The first explorationphase includes a 7,600 square kilometer 3D seismic requirement, which has been completed.33'