NEW YORK (Reuters) - U.S. benchmark gold futures scaled a new 25-year high at $700 an ounce on Tuesday, boosted by relentless investor buying powered by geopolitical concerns and expectations of further price gains ahead, dealers said. By 11:30 a.m. EDT, June delivery gold on the New York Mercantile Exchange's COMEX division was up $20.10 or 2.9 percent at a session peak of $700, which marked the loftiest level for futures since September 1980.
