Gold prices inched up on Thursday with tension over Greece a centerpiece for investors as the country and its creditors remain at an impasse. On the Comex division of the New York Mercantile Exchange, gold futures for June delivery rose 0.16% to $1,203.20 a troy ounce. Elsewhere, silver for May delivery gained 0.19% to 16.310 a troy ounce. Copper for May delivery eased 0.01% to 2.723 a pound. Overnight, gold futures increased modestly on Wednesday, amid mounting worries of a Greek default on its sovereign debt.