Ascent Resources PLC (LON:AST) shares gained around 20% in Monday morning dealing as it extended a gas sales deal in Croatia.
A new six-month extension takes expiry to 1 November 2019, following prior extensions.
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The company noted that it is the intention of all sides to conclude a revised deal for November onwards.
"I am pleased that the agreement has been extended again,” said Colin Hutchinson, Ascent chief executive.
“We value our relationship with INA and look forward to concluding a revised agreement with increased production targets in due course."