GEORGETOWN, Oct 13 (Reuters) - Oil production by a

consortium led by Exxon Mobil ( XOM ) in Guyana rose to 770,000

barrels per day (bpd) following the start-up of the group's

fourth floating output facility, the company's chief for the

South American country said on Monday.

Average output was 685,000 bpd in August and 740,000 bpd in

September.

The U.S. energy major is now focused on completing an

environmental impact assessment for the development of its

eighth project there, Longtail, and expecting to start up the

fifth and sixth projects, which already received government

approval, in 2026 and 2027, respectively.