Affiliation: | 1.Department of Mining Engineering, University of Kentucky, Lexington, USA ;2.Department of Civil and Mining Engineering, University of Namibia, Windhoek, Namibia ;3.School of Mining Engineering, University of the Witwatersrand, Johannesburg, South Africa ;4.Department of Mining and Process Engineering, Namibia University of Science and Technology, Windhoek, Namibia ;5.Mining and Mineral Processing Engineering Department, Taita Taveta University, Voi, Kenya ;6.DSI/NRF Clean Coal Technology Research Group, Faculty of Engineering and the Built Environment, University of the Witwatersrand, WITS, Johannesburg, 2050, South Africa ;7.Department of Mining Engineering, Federal University of Technology, Akure, Nigeria ;8.Oulu Mining School, University of Oulu, Oulu, Finland ; |