Gold prices firmed up further at the bullion market in Mumbai on Saturday due to persistent buying by stockists and jewellers amid a firm trend in global markets.Catching up with the general trend, silver also surged on sustained demand from industrial users fueled by strong overseas sentiment.Standard gold (99.5 purity) shot up by Rs 110 per ten grams to end at Rs 17,955 from Friday's closing level of Rs 17,845.Pure gold (99.9 purity) also hardened by Rs 105 per ten grams to close at Rs 18,035 as against Rs 17,930 Friday.Silver ready (.999 fineness) spurted by Rs 830 per kilo to conclude at Rs 29,230 from Rs 28,400 previously.In New York, gold futures for June delivery settled higher by USD 13.10, or 1.1 per cent, to USD 1,210.40 an ounce on the Comex division of the NYMEX.(Source DD)