METALS-London aluminium slips, on track for biggest weekly drop since 2011

BEIJING, April 27 (Reuters) - London aluminium prices edged down on Friday, having jumped in the previous session as investors bet that U.S. sanctions would remain in place on Russian producer Rusal, keeping supply tight. The metal is trading lower for a fifth session out of seven and has lost 8.2 percent so far this week, putting it on course for its biggest weekly drop since the week ended Aug. 5, 2011. FUNDAMENTALS * LME ALUMINUM: Three-month copper on the London Met