1. Hunan Provincial Key Laboratory of Intelligent Computing and Language Information Processing, College of Information Science and Engineering Hunan Normal University Changsha 410081 China
2. Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring (Central South University) Ministry of Education Changsha 410083 China
3. Key Laboratory of Geophysical Electromagnetic Probing Technologies of Ministry of Natural Resources, Institute of Geophysical and Geochemical Exploration Chinese Academy of Geological Science Langfang 065000 China
4. Technical Innovation Center of Coverage Area Deep Resources Exploration Ministry of Natural Resources Hefei 230001 China