Offshore oil and gas in the Gulf of Mexico (United States) blowout) began on April 20, 2010, in the Gulf of Mexico on the BP-operated Macondo Prospect. Killing eleven people, it is considered the largest marine oil spill in the history of the petroleum industry and estimated to be 8% to 31% larger in volume than the previous largest, the Ixtoc I oil spill. In 2012, federal leases in the Gulf of Mexico produced of oil, which made up 19.5% of all U.S. oil production that year, and more than that of any U.S. state other than Texas. The 2012 production was less than the in 2009; however, due to new
Gulf Oil Gulf Oil Gulf Oil was a major global oil company from 1901 until March 15, 1985. The eighth-largest American manufacturing company in 1941 and the ninth-largest in 1979, Gulf Oil was one of the so-called Seven Sisters oil companies. Prior to its merger with Standard Oil of California, Gulf was one of the chief instruments of the Mellon family fortune; both Gulf and Mellon Financial had their headquarters in Pittsburgh. Gulf's former headquarters, originally referred to as "the Gulf Building" (now the Gulf Tower office condos), is an Art Deco skyscraper. The tallest building in Pittsburgh until 1970, when it