By Chanyaporn Chanjaroen Dec. 11 (Bloomberg) -- Copper may drop and aluminum extend gains after the ratio between the two metals fell below the 200- day moving average for the first time since February, according to Barclays Capital. Demand for copper for delivery in three month on the London Metal Exchange may strengthen at $6,566 a metric ton, 4.8 percent below the current price of $6,900, London-based Phil Roberts and other analysts said in a report dated yesterday. The ratio of copper to aluminum was at 3.09 as of 10:16 a.m. in London today, below the 200-day moving average. Copper headed for a weekly loss of 2.1 percent, the first decline in six weeks. Aluminum advanced 4 percent this week, trading at $2,237 a ton today, the highest since October 2008. Any drop in copper may be reversed because prices remain on an “uptrend,” with a target of $7,390 and then $7,630, the analysts said. For aluminum, “we maintain a bullish bias” and prices may climb as high as $2,357, they said.

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