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Mining Engineering

Copyright 2012 by the Society for Mining, Metallurgy and Exploration, Inc. All rights reserved. MINING ENGINEERING magazine (ISSN 0026–5187) print and online is published monthly by the Society for Mining, Metallurgy, and Exploration, Inc., at 12999 E. Adam Aircraft Circle, Englewood, CO, 80112 USA. Phone +1–800–763–3132 or 303–973–9550. Fax: +1-303–973 –3845 or e-mail:

More than one photocopy of an item from either the print or online edition of Mining Engineering may be obtained from SME and may be made for internal use, provided fees are paid directly to the Copyright Clearance Center, 27 Congress St., Salem, MA, 01970, USA. Phone +1-978–750–8400, fax +1-978–750-4470. PDF files of articles in Mining Engineering are available at or Other forms of reproduction requires special permission from, and may be subject to fees by SME. SME is not responsible for any statements made or opinions expressed in its publications. Member subscription rate included in dues. Nonmember subscription rate, $245; in Europe, $275. Single copies $25.

For more information, contact the editor at, +1-303-948-4245.