Europe passed a “major milestone” on the way to starting commercial shale gas production as San Leon Energy Plc said testing at one of its Polish wells was successful.Natural gas flowed from the vertical Lewino well in a shale formation in the Baltic Basin in northern Poland at as much as 60,000 cubic feet per day during tests, Dublin-based San Leon, a natural-gas explorer backed by billionaire George Soros and Blackrock Inc., said in a filing. The company will start drilling a more productive horizontal well no later than July,...

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