For decades, coal from West Virginia’s vast deposits was mined, loaded on rail cars and hauled off without leaving behind a lasting trust fund financed by the state’s best-known commodity. Big coal’s days are waning, but now a new bonanza in the natural gas fields has state leaders working to ensure history doesn’t repeat itself. West Virginia’s Senate president, Jeff Kessler, is pushing to create an oil and natural gas trust fund to support core government functions decades from now. His goal: a cushion of funds long after the gas is depleted to buoy an Appalachian mountain state chronically vexed...