* May U.S. retail sales data due at 1230 GMT * Fed to announce QE taper in Aug or Sept -poll * Platinum, silver shed nearly 1%, palladium ticks up (Updates prices, adds comment) June 15 (Reuters) - Gold prices were subdued in a tight range on Tuesday ahead of a U.S. Federal Reserve meeting that could provide an indication on the eventual withdrawal of economic support. Spot gold edged 0.1% lower to $1,863.30 per ounce by 1130 GMT. Prices touched a near one-month low of $1,843.99 on Monday. U.S. gold futures were flat at $1,865.60. “Investors are being cautious ... with very little appetite at the moment to drive gold in one direction or the other,” said CMC Markets UK’s chief market analyst, Michael Hewson. For the second time in less than a decade, the Fed is getting ready to launch a debate over how and when to sunset a massive asset-purchase program. “It’s just not necessary; that amount of stimulus, at this stage of the economic rebound, so that’s why we’re seeing a little bit of weakness in gold prices over the past two to three days. The picture will become a lot clearer tomorrow,” CMC’s Hewson added. Nearly 60% of economists in a Reuters poll said a taper announcement will come next quarter. “We expect gold to end at $1,800 by end 2021 as the global vaccination drive gathers pace while the Fed turns increasingly less dovish on its monetary stance, driving real rates higher and in turn pushing gold prices down,” analysts at OCBC said in a note. Investors also awaited a slew of U.S. economic data, including monthly retail sales. “There’ll be some focus on the Producer Price Index (PPI) for May ... it could provide clues on whether to expect further inflationary pressures down the road,” Lukman Otunuga, analyst at FXTM, said in a note. The dollar index rose 0.1%, potentially decreasing bullion’s appeal for those holding other currencies. Elsewhere, silver shed 0.8% to $27.62 per ounce, platinum slipped 0.71 %, to $1,156.74, while palladium rose 0.3% to $2,760.19. (Reporting by Arundhati Sarkar and additional reporting by Arpan Varghese in Bengaluru; Editing by Alexander Smith and Steve Orlofsky) Our Standards: The Thomson Reuters Trust Principles.