Document Type : Research Paper
Authors
1 Mining and Metallurgical Engineering Department, Faculty of Engineering, Assiut University, Assiut, 71518, EGYPT Fax: +20 088 2332553
2 Professor of Mining and Environmental Engineering T.H. Huxley School of Environment, Earth Science and Engineering Imperial College of Science, Technology and Medicine,London, SW7 2BP, UK Fax: +44 0171-594-7444
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