Gold futures on the COMEX Division of the New York Mercantile Exchange extended gains on Thursday, settling at a six-week high, supported by a surprise interest rate cut by the European Central Bank and reemerged flight-to-quality buying, as mounting Greece uncertainty prompts risk-off. The most active gold contract for December delivery rose 35.5 dollars, or 2.1 percent, to 1,765.1 dollars per ounce.