1. State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan 430074, China
2. Department of Applied Geology, Curtin University, GPO Box U1987, Perth, Western Australia 6845, Australia
3. School of Earth Resources, China University of Geosciences, Wuhan 430074, China
4. United States Geological Survey, Denver Federal Center, MS973, Box 25046, Denver, Colorado 80225, USA
5. Geological Survey of Finland, 02150 Espoo, Finland
6. CSIRO Mineral Resources, Australian Resources Research Centre, 26 Dick Perry Avenue, Kensington, Perth, Western Australia 6151, Australia
7. Geological Survey of Gansu Province, Lanzhou 730000, China
8. Fourth Institute of Geological and Mineral Exploration of Gansu Provincial Bureau of Geology and Mineral Resources, Jiuquan 735000, China