Spot gold edged higher on Thursday, on course for a fourth session of gains, supported by hopes of increased funding from the International Monetary Fund to help tackle the euro zone debt crisis. Spot gold inched up 0.3 percent to $1,663.99 an ounce by 0615 GMT, approaching a one-month high of $1,667.41 hit earlier in the week. US gold also gained 0.3 percent to $1,664.50.