Making gold cheaper for holders of other currencies, the dollar index fell 0.2% to its lowest level since May 11. Benchmark 10-year U.S. Treasury yields also slipped to their lowest in nearly a week. * While a few Fed members said on Monday the central bank was close to ending its monetary policy tightening, Fed Bank of New York President John Williams reiterated that the central bank was not done raising its short-term rate target on Tuesday.