Gold (GC=F) and silver (SI=F) are among this year’s biggest winners, with momentum driving prices to record highs and setting up their best year since 1979. Gold traded above $4,500 per troy ounce on Wednesday, notching another milestone in a year packed with more than 50 record highs. Silver has had an even stronger year, soaring 150$70 on Wednesday, while futures climbed past $72 an ounce. Meanwhile, copper (HG=F) was also particip ...