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NEW YORK ( TheStreet) -- MarkWest Energy Partners (NYSE: MWE) hit a new 52-week high Wednesday as it is currently trading at $59.06, above its previous 52-week high of $59.02 with 61,970 shares traded as of 10:19 a.m. ET. Average volume has been 658,500 shares over the past 30 days. MarkWest Energy has a market cap of $4.85 billion and is part of the basic materials sector and energy industry. Shares are up 6.4% year to date as of the close of trading on Tuesday. Markwest Energy Partners, L.P., together with its subsidiaries, engages in the gathering, processing, and transportation of natural gas. The company has a P/E ratio of 60.3, below the average energy industry P/E ratio of 64.2 and above the S&P 500 P/E ratio of 17.7.