Abstract: The Mangkang Xiquheqiao copper-gold polymetallic mining area is located in the middle section of China’s “Sanjiang” metallogenic belt. Through the study of 10/10,000 soil geochemical surveys in the mining area, the element anomalies dominated by Cu and Au in the area have been identified and circled. Three comprehensive anomalous zones, mainly Cu-Au-Ag-Pb-Zn (HS1), Au-Cu (HS2), and Au-Pb (HS3) are presented. Analysis shows that HS1 and HS2 are A1 types, which will further expand the mineral deposit (point) prospecting prospects or discovering the anomaly of the prospect of new minerals. HS3 is the B3 type, inferring that the anomalies of the ore points and below may be found. Through research and analysis of the anomalous forms and enrichment rules of elements, the prospecting target area is reduced. According to the abnormal features, the target area was verified by trenching and drilling engineering, and multiple gold mineralizations were circled, and gold deposits with small to medium-sized prospects were discovered, showing the potential to find porphyry copper-gold deposits.

Key words: middle section of “Sanjiang”; Xiquheqiao, geochemical anomaly; geological interpretation