1. (SEG SF),† Department of Geology and Geological Engineering, Colorado School of Mines, Golden, Colorado 80005, USA; EGRU (Economic Geology Research Centre) and Academic Group of Geosciences, College of Science and Engineering, James Cook University, Townsville, Queensland 4811, Australia
2. (SEG SF), Department of Geology and Geological Engineering, Colorado School of Mines, Golden, Colorado 80005, USA; State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing 100083, China