翠宏山铁多金属矿为矽卡岩型矿床，矿体具强磁、低阻特征，为可控源音频大地电磁法 (CSAMT) 在该矿田内进行深部找矿提供了前提条件。野外工作采用磁法和 CSAMT 对翠宏山普查区进行施测。通过对普查区高精度磁法测量数据处理和 CSAMT 法测量数据进行二维反演，圈定高磁异常和推断解释出低阻异常和背景区，推断矿体的位置、埋深和范围。经钻孔验证，发现厚大矿体，使翠宏山铁多金属矿床规模上升为大型矿床，也验证了 CSAMT 法在深部找矿工作中的有效性。

Cuihongshan Fe polymetallic deposit is a deposit in skran type． The deposit is characterized by strong magnetism and low resistivity， which provides precondition to deep prospecting in the mining area by CSAMT method． The authors use magnetic and CSAMT methods to detect the general survey in the field work． According to two-dimension inversion of highly precisive magnetic surveying data processing and measured data by CSAMT meth- od， the authors delineate high magnetic anomaly and explain low resistivity anomaly and background area， and infer the position，depth and scope of ores． The scale of Cuihongshan Fe polymetallic deposit rise up to large scale de- posit by the discovery of thick ore body，and the effectiveness of CSAMT method in deep prospecting has been veri- fied．