Preliminary application of grade equivalent theory in a local section of a mine and economic estimation of the depositGuan Wang, Huaqiang Song, Zongda Yang, Lize Wang, Pei Xue, Jingyuan Xu and Wei JiangE3S Web Conf., 394 (2023) 01014DOI: https://doi.org/10.1051/e3sconf/202339401014