The Aluminum Monthly Metals Index (MMI) remained sideways with an upside bias, rising 0.56% from August to September. Meanwhile, the global price of aluminum reached highs not seen since the beginning of the year. Track other MetalMiner monthly indexes here, and compare how the overall industrial metal market is performing. Aluminum Prices Bullish on Global Supply Concerns LME aluminum touched a 6-month high by its September 16 close as the price of aluminum broke out of its sideways trend on emerging deficit concerns due to Chinese output nearing…