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Alpha Slumps After Goldman Sell Rating on Coal Oversupply

Alpha Natural Resources Inc., the largest U.S. producer of coal used to make steel, slumped the most in more than two years after Goldman Sachs Group Inc. cut its rating to sell and lowered price estimates for the commodity.

Alpha declined 12 percent to $4.80 at the close in New York, the biggest drop since Sept. 21, 2011. Other U.S. metallurgical-coal producers also fell: Walter Energy Inc. slid