1. State
Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology, China
2. College
of Geoscience and Survey Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China
3. Department
of Geology, Southern Illinois University, Carbondale, Carbondale, Illinois 62901, United States
4. School
of Resources and Geosciences, China University of Mining and Technology, Xuzhou 221116, China