Gold prices edged lower on Thursday, weighed down by a firmer dollar as investors looked forward to key U.S. inflation data due later this week for more cues on the interest rate path. Spot gold was down 0.2% at $4,084.29 per ounce, as of 0310 GMT. U.S. gold futures for December delivery climbed 0.9% to $4,100.90 per ounce. The dollar index rose 0.2% against its rivals, making gold more expe