LONDON (MarketWatch) -- Oil company BP BP, -2.19% BP, -1.18% said Monday that the cost of the response to the Gulf of Mexico oil spill has reached around $3.5 billion. The group also said that the installation of a new sealing cap that is intended to capture more of the leaking oil is proceeding as planned. BP is developing further containment systems that should be able to capture between 60,000 and 80,000 barrels of oil a day and the group said it expects these projects to begin operations towards the end of July. On Saturday, a total of 15,200 barrels of oil were collected or flared and 35.2 million cubic feet of gas were flared. The company said it has so far received 105,000 claims and has made payments on roughly 52,000 of them.