Because of the severe electromagnetic interference and the human interference in a copper mine in Anhui Province, the traditional electromagnetic method is unable to obtain valid data. CSAMT method has stronger anti-interference capability, but the mean square relative error of CSAMT checkpoints data reaches 53.6% and the exploration effect is poorer. In this paper, wide field electromagnetic method was applied to the mining area and led to the obtaining of the high quality data, with the average relative mean square error being 5.6%. Compared with the inversion result of CSAMT method, wide-area electromagnetic inversion result is in accordance with the geological data, the depth error is less than 10%, and the position of the orebody is consistent with the drilling information. The test results show that wide field electromagnetic method has stronger anti-interference capability and can be used in strong interference field detection.