1. Ph.D. Student, School of Economics and Management, China Univ. of Geosciences, Wuhan 430074, China.
2. Professor, China Mineral Resource Strategy and Policy Research Center of China Univ. of Geosciences, Wuhan 43007, China; School of Economics and Management, China Univ. of Geosciences, Wuhan 430074, China (corresponding author)..
3. Assistant Professor, School of Information Sciences, Univ. of Pittsburgh, Pittsburgh, PA 15260.
4. Professor, School of Economics and Management, China Univ. of Geosciences, Wuhan 430074, China.