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The discovery, first proven in 1992, contains between 30 and 80 million barrels of recoverable oil, well above previous estimates for about 6 million barrels, the Norwegian Petroleum Directorate added.
The find is 7 kilometres north of the Grane field and near Statoil's Grane F oil discovery made in 2013.
Statoil owns 57 percent of the production licence, state holding firm Petoro has 30 percent and ExxonMobil has 13 percent.