Motley Fool | ExxonMobil's Massive Oil Discovery Keeps Getting Bigger Motley Fool ExxonMobil (NYSE:XOM) and its partners Hess (NYSE:HES) and China's CNOOC have found a treasure trove of oil off the shore of Guyana over the past four years. The companies recently unveiled the 10th discovery on their jointly held acreage position, ... |