Long-Distance Crosswell EM Logging of Copper Ore Using Borehole-Surface Current Injection in Slim Holes. - Jingxin Dang; Qing Zhao; Cheng Guo; Jiadai Li; Lei Zhang; Tianzhi Tang; Bo Dang 001; Ling Yang; Changzan Liu (IEEE J. Sel. Top. Appl. Earth Obs. Remote. Sens., 2022)