December gold climbed $3.60 to $600.70 an ounce. It hasn't climbed above $600 since Sept. 14. "The catalyst for this move has been the convergence of two primary factors: the cessation ... of the central bank disposals and the emergence of positive demand reports from key consuming countries," said Jon Nadler, an analyst at Kitco.com. December silver rose 15.5 cents to $11.65 an ounce and December copper added 2.1 cents to $3.487 a pound. Metals indexes rose, with the Amex Gold Bugs Index.