Acid neutralizing capacity minerals in Barani Pit PT Agincourt Resources Martabe, North Sumatera: alternative agent on neutralizing acid mine drainageRinal Khaidar Ali, Lestari Butar-butar, Nurakhmi Qadaryati and Narulita SantiE3S Web Conf., 202 (2020) 02008DOI: https://doi.org/10.1051/e3sconf/202020202008