NEW YORK, Jan 21 (Reuters) - U.S. silver futures surged at midday Friday to a three-week high of $6.79 an ounce as fund buying touched off buy-stop orders which quickened the climb, floor sources said.
Silver for March delivery was up 23.2 cents at $6.79 an ounce at 11:53 a.m. EST (1653 GMT), trading from $6.55 to $6.7950.
The $6.795 session peak was silver's loftiest level since Jan 3.