1. School of Geosciences and Info-physics, Central South University, Changsha, China
2. Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring, Central South University, Ministry of Education, Changsha, China
3. School of Resources and Safety Engineering, Central South University, Changsha, China
4. Radar Monitoring Technology Laboratory, School of Information Science and Technology, North China University of Technology, Beijing, China