Gold prices surged to a 4-week high as demand for the safe-haven metal rose due to worries over the worsening economic impact from the coronavirus pandemic. Spot gold trading 0.2 percent up at $1,665.31 per ounce by 0553 GMT, having touched a high of $1675.60 earlier, its highest since Mar. 10. U.S. gold futures rose 1.7 percent to $1,723.