BP ( BP.L ) on Monday agreed to buy stakes in gas-heavy exploration areas off the coast of Mauritania and Senegal from Kosmos ( KOS.N ), days after announcing the long-awaited renewal of an onshore oil concession in Abu Dhabi. The combined deals are worth around $3.4 billion and will add valuable oil and gas reserves to BP’s books that have seen resources shrink on the back of divestments it needed to make to pay for the 2010 Gulf of Mexico oil spill. They follow BP’s purchase of a stake in Eni’s giant Zohr gas field offshore Egypt for $375 million last month and come at a time of rising oil prices. BP said on Monday it had agreed to buy a 62 percent stake and operational control of Kosmos’ Mauritania exploration […]