1. Doctorate Program of Mining Engineering, Faculty of Mining and Petroleum Engineering, Institut Teknologi Bandung, Jl. Ganesha, 10, Bandung 40132, Indonesia
2. Research Centre for Geological Resources, National Research and Innovation Agency, Jl. Sangkuriang, 21, Bandung 40134, Indonesia
3. Department of Metallurgical Engineering, Faculty of Mining and Petroleum Engineering, Institut Teknologi Bandung, Jl. Ganesha, 10, Bandung 40132, Indonesia