1. Department of Resources Science and Engineering, Faculty of Earth Resources; China University of Geosciences; Wuhan 430074 China
2. MOE Key Laboratory of Non-ferrous Metal Ore Forecast, School of Geosciences and Info-physics; Central South University; Changsha 410083 China
3. Guangxi Land and Resources Planning Institute; Nanning 530022 China
4. National Institute of Geological Sciences; University of the Philippines; Diliman Quezon City 1101 Philippines