Gold prices edged lower on Monday as higher U.S. Treasury yields weighed on dollar-priced bullion, while investors kept a close watch on any potential escalation in the Middle East conflict. Benchmark 10-year U.S. Treasury yields US10Y edged up and were last at 4.6475%, making non-yielding bullion less attractive for investors.Persistent inflation and higher-for-longer interest rates were cited as key risks to financial stability in the Federal Reserve's latest survey of U.S. central bank contacts.Higher interest rates reduce the appeal of holding non-yielding gold. Silver may have the power to reach the $30-per-ounce milestone after its 26% surge in March-April on the back of gold's record run and copper's strength, even though analysts say the metal is ripe for a technical correction.