1. Associate Professor, School of Resources and Geosciences, China Univ. of Mining and Technology, Xuzhou 221116, China (corresponding author).
2. Engineer, Sichuan Provincial Water Resources Dept., 16 Yinsi St., Chengdu 610017, China.
3. Associate Professor, Dept. of Environmental Science, Jiangsu Normal Univ., Xuzhou 221116, China.
4. Professor, Dept. of Geology and Geophysics, Texas A&M Univ., College Station, TX 77843.
5. Associate Professor, School of Resources and Geosciences, China Univ. of Mining and Technology, Xuzhou 221116, China.
6. Engineer, Hubei Geological Exploration Institute of China Chemical Geology and Mine Bureau, Wuhan 430074, China.
7. Undergraduate, School of Resources and Geosciences, China Univ. of Mining and Technology, Xuzhou 221116, China.