1. Research Center for Mining Technology, BRIN, Lampung, Indonesia
2. Department of Physics, Sumatera Institute of Technology, South Lampung, Indonesia
3. Master Program of Physics, Faculty of Science, Sumatera Institute of Technology, South Lampung, Indonesia
4. Department of Physics, University of Lampung, Bandar Lampung, Indonesia
5. Tridharma Green Earth Campus, Kendari City, Southeast Sulawesi, Indonesia
6. Department of Chemical Engineering (Sustainable Mineral Processing Research Group), Faculty of Engineering, Gadjah Mada University, Yogyakarta, Indonesia