*Syaiful Hilal¹、Ryohei Takahashi²、Andrea Agangi²、Pearlyn Manalo²、Jonathan Tandang Macuroy⁵、Manuel Augusto Manuel Nopeia⁵、Hinako Sato²、Mega Fatimah Rosana³、Abdul Bari⁴、Bayuaji Jokosatriyo⁴、Bronto Sutopo⁴ (1.Graduate School of International Resource Sciences, Akita Univ.; Geomin unit, PT Aneka Tambang Tbk、2.Graduate School of International Resource Sciences, Akita Univ.、3.Faculty of Geological Engineering, Padjadjaran Univ.、4.Geomin unit, PT Aneka Tambang Tbk、5.Center for Regional Revitalization in Research and Education, Akita Univ.)