Gold and silver prices extended their rally on Wednesday, with analysts saying further gains will likely be determined by the direction of foreign exchange and interest rate expectations. Spot gold was up 2.4% at $5,054.6 per ounce as of 5:37 a.m. ET, while gold futures gained about 3.4%, to $5,1 . Meanwhile spot silver was up 5.8% $90 per ounce. Silver futures were up 8% at $90.16. Precious metals prices have rebounded strongly after a fall of nearly 10% for gold on Friday, and a 30% collapse