6 Mauritania-Senegal: A World Class Basin Kosmos opened a significant new hydrocarbon province when it discovered a large accumulation of natural gas offshore Mauritania and Senegal with the Tortue-1 well. Success was the result of applying the company’s proprietary knowledge of the Upper Cretaceous structural- stratigraphic play concept to the unique conditions of this region in which sands bypassed the shelf and deposited in deeper water. So far, in Mauritania and Senegal, Kosmos has discovered a gross natural gas resource of approximately 40 trillion cubic feet and further de-risked over 40 trillion cubic feet in the basin. Exploration Phase 1: Tortue, Bir Allah, Teranga In our first phase of exploration offshore Mauritania and Senegal, Kosmos made three frontier discoveries (Tortue, Bir Allah, and Teranga) with a 100% success rate within the in-board Central Anticline Trend. In addition, Kosmos also drilled the successful Guembeul and Ahmeyim-2 wells which delineated the size of the Greater Tortue discovery. Exploration Phase 2: Yakaar The second phase of exploration tested four independent prospects in the Outboard Basin Floor Fan Fairway, resulting in Yakaar, the industry’s largest hydrocarbon discovery of 2017, which together with Teranga creates a second potential natural gas hub in the region. The three tests following Yakaar were unsuccessful, but we have collected substantial sub-surface data from which we have gained additional knowledge that gives us a competitive advantage for future drilling and acreage capture in the basin. Next Steps Working with our partner BP, we will integrate the new sub-surface data into our understanding of how the petroleum systems work, further refining calibration of our 3D seismic and its derivative products. This activity should enhance our exploration capability in the future. Kosmos will pause drilling activity offshore Mauritania and Senegal to complete this work, as well as plan a third phase of exploration which we expect to start in 2019. We anticipate the third phase will focus on exploration and appraisal in support of potential additional gas hubs in southern Mauritania and northern Senegal, as well as continuing to search for oil. MAURITANIA SENEGAL TORTUE SENEGAL NOUAKCHOTT DAKAR 50 KM 60 MILES Atlantic Ocean Liquids or Gas Lead / Prospect Gas Discovery Gas Prospect DAKAR 60 miles 50 km TERANGA BIR ALLAH NOUAKCHOTT MAURITANIA SENEGAL YAKAAR MAURITANIA/SENEGAL EXPLORATION