Gold prices surged by Rs580 on Thursday to trade above the Rs30,000-mark at Rs30,250 per 10 gram, its highest level in over 5 weeks at the bullion market, largely in tandem with firming global trend. Furthermore, increased buying by jewellers at the domestic market too supported the upside in the yellow metal. Silver also recaptured the Rs42,000-mark by rising Rs700 to Rs42,050 per kg backed by increased offtake by industrial units and coin makers.