Gold slipped on Friday as market participants awaited closely watched remarks from Federal Reserve Chair Kevin Warsh at the Jackson Hole symposium. Spot gold fell 0.5% to $4,576.30 per ounce by 0157 GMT after hitting a more than three-month high earlier this week following the US Treasury’s announcement of support measures for long-duration bonds. US gold futures eased 0.8% to $4,629.00.