Oil futures have fallen after a brief rebound before the weekend, as the market focused firmly on whether OPEC is likely to cut output to tackle recent price slumps. Brent North Sea crude for delivery in December was down 46 US cents at $US79.11 a barrel at 0730 AEDT -- hit also by a strengthening US dollar that makes the commodity more expensive for holders of rival currencies. US benchmark West Texas Intermediate for December was down 31 US cents to $75.51 a barrel. OPEC's next meeting is set for November 27 in Vienna, home to the cartel's headquarters. Gold prices ended lower as a stronger US dollar edged out investors' worries about tensions between Russia and the West. Gold for December delivery, the most-actively traded contract, on Monday slipped 0.2 per cent to $US1,183.50 a troy ounce on the Comex division of the New York Mercantile Exchange, after hitting a two-week high of $US1,993.60 earlier in the session. The US dollar gained after Japan reported its economy shrank for a second quarter in a row, as a sales-tax increase earlier in the year continued to weigh on growth. The weaker data bolstered expectations that the Bank of Japan would need to continue stimulating the economy for a considerable time. The metal also found support from tensions between Russia and the West, which flared over the weekend after Russian President Vladimir Putin left the meeting of the Group of 20 industrial and developing nations early amid a frosty reception from some world leaders. Copper futures closed flat on the London Metal Exchange, maintaining losses sustained on the back of the Japanese economy sliding into recession and a firm US dollar. The LME's three-month copper contract was down 0.01 per cent at $US6,704.00 a metric ton at Monday's PM kerb close. Japan's economy shrank in the third quarter for the second quarter in a row. According to Commerzbank, given the country's position as a major importer of metals, an impact was likely -- particularly for copper. Aluminium closed up 0.3 per cent at $US2,029.00 a ton, zinc closed 0.1 per cent lower at $US2,257 a ton, nickel climbed 1.4 per cent to finish at $US15,800.00, lead closed up 1.2 per cent at $US2,045.00 a ton, and tin closed down 0.1 per cent at $US19,725.00.