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NEW YORK ( TheStreet) -- The ex-dividend date for AMCOL International Corporation (NYSE: ACO) is tomorrow, May 25, 2012. Owners of shares as of market close today will be eligible for a dividend of 18 cents per share. At a price of $28.93 as of 9:30 a.m. ET, the dividend yield is 2.5%. The average volume for AMCOL International has been 122,500 shares per day over the past 30 days. AMCOL International has a market cap of $904.1 million and is part of the basic materials sector and metals & mining industry. Shares are up 7.8% year to date as of the close of trading on Wednesday. AMCOL International Corporation engages in the development and application of minerals and technology products and services to various industrial and consumer markets. It operates in four segments: Minerals and Materials, Environmental, Oilfield Services, and Transportation. The company has a P/E ratio of 14.9, below the average metals & mining industry P/E ratio of 15.2 and below the S&P 500 P/E ratio of 17.7.