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NEW YORK ( TheStreet) -- Arch Coal (NYSE: ACI) hit a new 52-week low Wednesday as it is currently trading at $9.70, below its previous 52-week low of $9.73 with 6.2 million shares traded as of 11:40 a.m. ET. Average volume has been 9.4 million shares over the past 30 days. Arch Coal has a market cap of $2.15 billion and is part of the basic materials sector and metals & mining industry. Shares are down 29.8% year to date as of the close of trading on Tuesday. Arch Coal, Inc. engages in the production and sale of steam and metallurgical coal from surface and underground mines located in the United States. The company has a P/E ratio of 13.2, below the average metals & mining industry P/E ratio of 13.7 and below the S&P 500 P/E ratio of 17.7.