1. School of Ecological Environment, Institute of Disaster Prevention, Sanhe 065201, China
2. Chinese Academy of Natural Resources Economics, Beijing 100035, China
3. No.1 Geological Exploration Institute, General Administration of Metallurgical Geology of China, Sanhe 065201, China
4. Zhejiang Geological Exploration Institute, General Administration of Metallurgical Geology of China, Quzhou 324000, China