State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and the Ministry of Science and Technology;
Qingdao 266590;
China;
College of Energy and Mining Engineering;
Shandong University of Science and Technology;
Qingdao 266590;
China;
Department of Mining Engineering;
Colorado School of Mines;
Golden;
CO;
80401;
USA;
School of Geology and Mining;
Mongolian University of Science and Technology;
Ulaanbaatar 120646;
Mongolia;
