The index that measures the greenback against six major currencies on a prorated scale fell 0.01 percent to 79.07 on the International Exchange.
Gold prices climbed for the seventh consecutive trading session, adding $15.10 on the Comex division of the New York Mercantile Exchange to reach $1,657.40 per troy ounce.
Silver gained 70 cents to reach $31.30 on the exchange.
The euro fell to $1.3214 from Wednesday's $1.3217, while the British pound rose to $1.6173 from $1.6163.
Against the Japanese yen, the dollar fell to 81.04 yen from 81.32 yen. The dollar was at 7.7598 Hong Kong dollars from 7.7604.
The dollar rose to 0.9853 Canadian dollars from 0.9833. The Australian dollar rose to $1.0384 from Wednesday's $1.0353.