b'Ahmeyim Field and created the Greater Tortue Ahmeyim Unit from portions of the Mauritania BlockC8 and the Senegal Saint Louis Offshore Profond areas.(4) Our paying interest on development activities in the TEN fields is 19%.(5) Our interests in blocks EC 381, GB 463 and GB 506 are 30%, 15% and 30%, respectively.(6) Our interests in blocks MC 214 and MC 215 are 61.1% and 54.9%, respectively.(7) SMHPM has the option to acquire up to an additional 4% paying interests in a commercialdevelopment on Block C8. These interest percentages do not give effect to the exercise of such option.(8) PETROSEN has the option to acquire up to an additional 10% paying interests in a commercialdevelopment on the Saint Louis Offshore Profond and Cayar Offshore Profond blocks. The interestpercentage does not give effect to the exercise of such option.(9) Kosmos owned a 50% interest in KTIPI which held an 85% interest in the Ceiba Field and OkumeComplex through its wholly-owned subsidiary, Kosmos-Trident Equatorial Guinea Inc. (KTEGI),representing a 40.375% net indirect interest to Kosmos. Kosmos and Trident provided operationalmanagement and support to KTEGI, who is operator of the Ceiba Field and Okume Complex. EffectiveJanuary 1, 2019, our outstanding shares in KTIPI were transferred to Trident Energy (Trident) inexchange for a 40.375% undivided interest in the Ceiba Field and Okume Complex and Trident becamethe operator. As a result, our interest in the Ceiba Field and Okume Complex will be accounted forunder the proportionate consolidation method of accounting going forward.(10) Our U.S. Gulf of Mexico blocks are held by production/operations, and the lease periods extend as longas production/governmental approved operations continue on the relevant block.(11) License expiration date can be extended by an additional ten years subject to certain conditions beingmet.(12) License expiration date can be extended beyond the current exploration period upon completion ofrequired work program and subject to additional work obligations.Exploration License and Lease AreasKosmos AverageNumber of Participating LicenseCountry Blocks Interest Operator(s) Expiratio RangeCote dIvoire . . . . . . . . 5 45.0%(1) Kosmos 2020(8)Equatorial Guinea . . . . 4 40.0%(2) Kosmos 2020 - 2021(8)Mauritania . . . . . . . . . . 5 25.4%(3) BP, Total 2019 - 2020(8)Namibia. . . . . . . . . . . . 1 45.0%(4) Shell 2019(8)Sao Tome and Principe . 6 45.0%(5) Kosmos, BP, Galp 2019 - 2022(8)Senegal . . . . . . . . . . . . 2 30.0%(6) BP 2020 - 2021Suriname . . . . . . . . . . . 2 41.7%(7) Kosmos 2020 - 2021(8)U.S. Gulf of Mexico . . . 22 54.0% Kosmos, Chevron, LLOG, Murphy 2019 - 2028(9)(1) PETROCI has the option to acquire up to an additional 2% paying interests in a commercialdevelopment. The interest percentage does not give effect to the exercise of such option.(2) Should a commercial discovery be made, GEPetrols 20% carried interest will convert to a 20%participating interest for all development and production operations.(3) Should a commercial discovery be made, SMHPMs 10% carried interest is extinguished andSMHPM will have an option to acquire a participating interest in the discovery area between 10%and 14% (blocks C8, C12 and C13), 10% and 15% (Block C18) and 10% and 18% (Block C6).SMHPM will pay its portion of development and production costs in a commercial developmenton the blocks. The interest percentage does not give effect to the exercise of such option.15'