By Ron Bousso LONDON (Reuters) -Impact Oil & Gas is considering selling its 20% stake in a large block in deep water off the coast of Namibia where TotalEnergies made a significant oil discovery this year, four industry sources told Reuters. Impact, which is privately owned and focused on exploration in Africa, has hired investment bank Jefferies to prepare a sale process for its stake in Block 2913B, which is estimated to be worth $500 million to $1 billion, the sources said. TotalEnergies, which operates the field, said in February it made the discovery in the Venus-X1 well, the second offsh…

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