HONG KONG - Gold and silver tumbled for a second day on Wednesday, bringing a rally in the precious metals to a juddering halt. The rally has been built on a range of issues, including a weaker dollar, expectations of interest rate cuts, falling bond yields and central bank buying. At one point Wednesday, it hit a low of $4,000 -- a day after chalking up a record peak of $4.381.51. The retreat hit gold miners and producers. And Hong Kong-listed Zijin Gold International shed more than four percent and Shandong Gold Mining was off nearly two percent, while Merdeka Copper Gold dived around four percent in Jakarta.