1. School of Resources and Geosciences, China University of Mining and Technology, 221116 Xuzhou, China
2. Nanjing City Vocational college, 211200 Nanjing, China
3. Sichuan Liwu Copper Co., Ltd., 610091 Chengdu, China
4. Nanjing Center, China Geological Survey, 210016 Nanjing, China