Utilization of Fly Ash, Bottom Ash, and Local Organic Materials to Support Circular Economy in Coal Mine ReclamationArief Juniarto, Suryo Hardiwinoto, Eny Faridah, Irdika Mansur and Adi Arti ElettariaBIO Web Conf., 167 (2025) 03015DOI: https://doi.org/10.1051/bioconf/202516703015