Prospecting effectiveness of superconducting transient electromagnetic detection technology in Carlin-type gold deposits

To address the technical challenges of limited penetration depth and restricted resolution associated with traditional electromagnetic methods in the exploration of deep-seated concealed orebodies in Carlin-type gold deposits and to facilitate deep resource development of the Yunnan−Guizhou−Guangxi "golden triangle" Carlin-type gold ore concentration area, this study conducted prospecting application research using superconducting transient electromagnetic detection technology. This approach featured low noise, high sensitivity, and wide bandwidth, relying on the core ore-controlling characteristics of structural-alteration bodies in Carlin-type gold deposits. By taking the Lannigou Gold Deposit, a typical Carlin-type gold deposit, as an example, this study conducted targeted detection of key geological bodies associated with ore occurrence, specifically low-resistivity fracture zones and hydrothermal alteration zones. The results indicate that this technology overcomes the limitations of traditional electromagnetic methods, achieving accurate identification of concealed orebodies at depths exceeding 2 000 m. Furthermore, it exhibits distinct response characteristics for ore-controlling targets, allowing for the clear delineation of favorable metallogenic target areas. Integrated with comprehensive geological analysis, the spatial distribution patterns of ore-controlling structural zones are precisely clarified, enabling the accurate inference of the burial depth and extension direction of concealed orebodies. The detection results demonstrate a high degree of consistency with orebodies verified by drilling, providing reliable technical support for the efficient exploration of deep concealed resources in Carlin-type gold deposits. Consequently, this method has significant promotion and application value for deep prospecting in the Yunnan−Guizhou−Guangxi "golden triangle" Carlin-type gold ore concentration area.