Mauricio Palos / Bloomberg via Getty Images GM reported better-than-expected results and boosted its full-year outlook Key Takeaways Major U.S. equities indexes were mostly higher at midday Tuesday, after a flurry of corporate earnings reports. General Motors shares surged after the automaker reported better-than-expected earnings and boosted its outlook. Gold mining firm Newmont's stock dropped along with the price of the precious metal. Major U.S. equities indexes were mostly higher at midday Tu ...