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Exxon Mobil has lost its arbitration challenge to block Chevron's $55 billion Hess acquisition deal, but the top U.S. oil producer managed to delay the tie-up by over a year, costing its rival billions in lost Guyana oil revenue and slowing integration.

Chevron will proceed with its $53 billion acquisition of Hess, after it prevailed in a landmark legal battle against larger rival Exxon Mobil to gain access to the largest oil discovery in decades.