* SPDR Gold Trust GLD, the world's largest gold-backed exchange-traded fund, said its holdings fell 0.2% to 915.32 tonnes on Monday. Jan 10 (Reuters) - Gold prices inched lower on Tuesday as the U.S. dollar witnessed an uptick, with traders largely focusing on Federal Reserve Chair Jerome Powell's speech for insights into the central bank's rate hike path. * The event comes against the backdrop of Fed policymakers saying this week's inflation data will help them decide whether they can slow the pace of rate hikes at their upcoming meeting, to just a quarter point increase.