1. MNR Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, CAGS, Beijing 100037, China
2. School of Geoscience and Info-physics, Central South University, Changsha, Hunan Province 410083, China
3. MLR Laboratory of Geophysical EM Probing Technologies, Institute of Geophysical and Geochemical Exploration, Chinese Academy of Geological Sciences, Langfang, Hebei Province 410083, China
4. Department of Earth Sciences, Institute of Geophysics, ETH Zurich, 8092 Zurich, Switzerland
5. Institute of Geology and Geophysics, Chinese Academy of Sciences (IGGCAS), Beijing 100029, China
6. Department of Geoscience, Aarhus University, DK-8000 Aarhus C, Denmark
7. Institute of Geophysics and Geomatics, China University of Geosciences (Wuhan), Wuhan 430074, China