1. Michigan Technological University, Geological and Mining Engineering and Sciences, 1400 Townsend Drive, Houghton, Michigan 49931, United States
2. Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, California 91109, United States
3. Michigan Technological University, School of Technology, 1400 Townsend Drive, Houghton, Michigan 49931, United States