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Rafiei et al., reported a pH value of 7.35 in gold mine tailings in Iran, whereas Mitileni et al., reported pH values of 3.25–6.28 in South Africa and Harish and David pH value of 3.48–8.12 in India. Highly acidic pH has also been observed in acid mine drainage arising from gold mining activity in other studies [25,26].

pdf Surface Coal Mining Technology Download Free. Author r d singh publisher new age international isbn 9788122409741 size 8028 mb format pdf epub category coal languages en pages 696 view 395 get book book description principles and practices of modern coal mining is a comprehensive text book on the theory and practice of coal mining it …

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Principles and Practices of Modern Coal Mining by R D . The title of this book is Principles and Practices of Modern Coal Mining and it was written by R D Singh This particular edition is in a Paperback format This books publish date is Unknown It was published by New Age International (P) Ltd and has a total of 696 pages in the book

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R D Singh Coal Mining Pdf Civil engineering256 мб isbn 085226819x publication year 1980 edition first pages 616 price 17500 paperback 75 78 principles and practices of modern coal mining rd singh.

The fully mechanized backfill technology mining method was adopted to extract a coal seam at a depth of approximately 500 m. The coal seam was approximately 2.7 m thick and dipped at an angle of approximately 12° toward the east. The width of the longwall working face and the length of the longwall panel were 100 m and 1100 m, respectively.

Author R D Singh Publisher New Age International ISBN 9788122409741 Category Coal Page 696 View 753 DOWNLOAD NOW » Principles And Practices Of Modern Coal Mining Is A Comprehensive Text Book On The Theory And Practice Of Coal Mining

United States. Bureau of Mines: Coal-mine fires and gas and/or dust ignitions since enactment of the 1952 Federal Coal Mine Safety Act / ([Washington, D.C.] : U.S. Dept. of the Interior, Bureau of Mines, [1960]), also by C. M. Keenan (page images at HathiTrust) United States.

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