1. Research and Development Division, FOCUS® Minerals Engineering Research Center, Zarand, Iran
2. Department of Mining Engineering, West Virginia University, Morgantown, West Virginia, USA
3. Department of Mining Engineering, Higher Education Complex of Zarand, Zarand, Iran
4. Department of Geoscience and Petroleum, Faculty of Engineering, Norwegian University of Science and Technology, Trondheim, Norway
5. Maelgwyn Mineral Services Ltd, Cardiff, UK