Partners pegged a pre-drill potential resource estimate for the Shabeel-1 probe at 300 million barrels.
Horn operates the Dharoor joint venture with a 60% stake, alongside Australian explorers Range Resources on 20% and Red Emperor Resources on 20%.
A similar equity breakdown applies to the equally prospective neighbouring Nugal basin block where territory is disputed with the breakaway state of Somaliland.
Shabeel-1 continues to drill ahead on Dharoor below 2002 metres.
