1. School of Resources and Materials Northeastern University at Qinhuangdao Qinhuangdao China
2. State Key Laboratory of Coal Resources and Safe Mining & College of Geosciences and Surveying Engineering China University of Mining and Technology Beijing China
3. Department of Power Generation Jingneng Qinhuangdao Thermal Power Co., Ltd. Qinhuangdao China
4. Hebei Center for Ecological and Environmental Geology Research Hebei GEO University Shijiazhuang China
5. School of Geosciences University of Edinburgh Edinburgh UK