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Hotmanahan Timbul is an experienced geotechnical expert with a background in mining and mineral engineering. Hotmanahan has worked in various roles with an extensive list of companies, including Teck Resources Limited, PT Adaro Energy, Straits Asia Resources, United Coal Indonesia, Freeport Indonesia, Kaltim Prima Coal, and PT Datanusa Mikromine. Hotmanahan's responsibilities have included managing geotechnical issues, special projects, contracts, and technical improvements in the mining industry. Hotmanahan holds a Master's degree in Engineering and Economics, along with a Bachelor of Science in Physics.