LONDON--The Special Chamber of the International Tribunal of the Law of the Sea in Hamburg has rejected a call from the Ivory Coast for Ghana to suspend oil exploration activity in offshore territory disputed by the two countries, exploration firm Tullow Oil PLC (TLW.LN) said Monday.

A suspension in the disputed region would have delayed the development on Tullow's TEN project.

"Development work on the TEN Project continues," Tullow said. "The project is now over 55% complete with all 10 of the wells expected to be online at first oil already drilled. The project remains within budget and on schedule with first oil expected in mid-2016," it added.

ITLOS has called for "continued cooperation" from the two countries until it reaches a final decision on the boundary dispute, which is expected in late 2017.

"Tullow is not a party to this arbitration process and will now await a decision by the Government of Ghana on how it will implement the provisional measures order," it added.

Write to Ed Ballard at ed.ballard@wsj.com

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