Integrated geophysical prospecting for deep ore detection in the Yongxin gold mining area, Heilongjiang, China

Abstract

Geophysical exploration techniques are crucial in facilitating accurate mineral prospecting predictions, but relying solely on single methods can introduce uncertainties. In this study, we employed audio-frequency magnetotelluric (AMT) methods, complemented by gravimetric surveying and high-resolution magnetic profiling in the Yongxin gold deposit. Utilizing advanced three-dimensional modeling techniques, we were able to precisely delineate the lithological variations and deep-seated mineralization features inherent to the area. The inversion and interpretation of cross-sectional AMT data illuminated the subsurface structure down to a depth of 1.5 kilometers. This enhanced data reliability was achieved through an integrated interpretation constrained by gravity, magnetic, and electrical datasets, thereby enabling a more accurate inference of the deeper geological framework. Furthermore, by amalgamating regional geological data, drilling information, and additional datasets, we uncovered the characteristics of deep mineralization, the three-dimensional configuration of mineralization-related rock masses, and the spatial orientation of known ore deposits. This approach facilitated a transparent visualization of the deeper geological formations. A thorough analysis was conducted on the distribution patterns of ore-controlling structures and exploration markers. Consequently, we have established a geological-geophysical model tailored for mineral exploration within the study area, which provides an effective reference for future deep exploration work.