Abstract: The Wulong gold mine is located in the Liao-Ji Paleoproterozoic gold polymetallic mineralization belt, and is one of the typical large-scale deposits within the Dandong Wulong-Sidaogou gold mineralization catchment area. In this study, based on the geological characteristics of the deposit and its ore-controlling factors, we constructed a deep three-dimensional geological structure model by integrating geological interpretation of large-scale gravity and magnetic data with inversion of the geodetic-audio-electromagnetic (GEM) data. Combined with geochemical anomalies of mineralization elements and the spatial distribution patterns of ore bodies, we extracted prospecting criteria and delineated target zones for deep ore bodies in the mining area. The study shows that mineralization in the Wulong gold mine is mainly of quartz vein type, with minor vein-fine vein tectonic alteration rock type. The NNE- to NS-trending fractures, NW-trending fractures, and Early Cretaceous magmatic intrusions are the key ore-controlling factors. The ore bodies exhibit a clustered and belt-like distribution with equal spacing, and the upper parts branch while merging in the lower part. The highly magnetic geological body, caused by the intrusion of Early Cretaceous granodiorite into the Middle and Late Jurassic biotite granite, represents the ore-forming geological body. Silicification and sericitization are the main wall-rock alteration indicators for prospecting. The anomalous range of mineralization factors F₁ (Ag-Pb-Zn-As-Sb-Hg-Au) and F₂ (Au-Bi-W), which represent the main stages of gold metallogenesis, serve as geochemical prospecting indicators. Geophysical indicators include high-magnetic geological bodies, gravity highs, and fracture structures within and along their margins, as well as low-resistivity and high-polarization electrical anomalies. The study determines that deep ore-forming structures and ore-forming geologic bodies are still active in the mining area. In combination with the characteristics of known ore bodies, we propose seven target zones for further exploration.

Key words: deep geological structure, ore-forming geological body, ore-forming structure, mineralization enrichment law, ore body prediction, Wulong gold mine, Dandong city, Liaoning