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NEW YORK ( TheStreet) -- Arch Coal (NYSE: ACI) hit a new 52-week low Friday as it is currently trading at $13.01, below its previous 52-week low of $13.09 with 6.3 million shares traded as of 2:40 p.m. ET. Average volume has been 6.4 million shares over the past 30 days. Arch Coal has a market cap of $2.91 billion and is part of the basic materials sector and metals & mining industry. Shares are down 7.8% year to date as of the close of trading on Thursday. Arch Coal, Inc. The company has a P/E ratio of 18.3, above the average metals & mining industry P/E ratio of 17.6 and above the S&P 500 P/E ratio of 17.7.