* SPDR Gold Trust GLD, the world's largest gold-backed exchange-traded fund, said its holdings fell 0.3% to 1,046.65 tonnes on Wednesday. June 24 (Reuters) - Gold prices edged lower on Thursday as a stronger dollar dented the metal's appeal, while investors awaited more U.S. economic data due this week to gauge inflationary pressures. USD/ * A period of high inflation in the United States may last longer than anticipated, two U.S. Federal Reserve officials said, prompting one to pull forward his views on when the central bank should start raising interest rates.