Gold extended losses on Wednesday, as bets on US interest rate hikes lifted the dollar, while investors assessed conflicting signals on the US-Iran peace talks. Spot gold fell 0.5% to $4,087.68 per ounce by 0116 GMT, hitting its lowest level since June 11. U.S. gold futures for August delivery declined 1.1% to $4,105.40. The dollar hit a more than one-year high, making bullion more expen