Identification of coal distribution based on drilling and geophysical logging: A case study from Samurangau, East KalimantanDhea Ameila Pratiwi, Dharma Ikhsan Mahendra Maynardi, Obrin Trianda and Dianto IsnawanE3S Web Conf., 688 (2026) 01005DOI: https://doi.org/10.1051/e3sconf/202668801005