The magnetic and electromagnetic integrated geophysical investigation of the Weilasituo tin polymetallic deposit, Inner Mongolia, China

The Weilastuo tin polymetallic deposit is located in the central-southern segment of the Great Xing’an Range, which is an important metallogenic belt of northern China. The Quaternary is widely distributed in the ore district, with the host rocks primarily consisting of migmatitic gneisses and a small amount of Carboniferous quartz diorite. The ore-related intrusive bodies are concealed at depths within the tin-zinc ore district, with the shallowest occurrences reaching approximately 400m below the surface. This study collected the rock samples from the Weilastuo and other districts, and accurately measured the physical properties parameters including resistivity, polarization, magnetic susceptibility, and natural remanent magnetization for over 480 rock samples. The research conducted multi-geophysical explorations and methodological experiments in the Weilastuo ore district, including surface and airborne magnetic exploration, audio magnetotellurics (AMT), and transient electromagnetic (TEM). The 3D magnetic susceptibility and resistivity structure model of the Weilastuo ore district were constructed, providing geophysical constraints for developing geophysical exploration models for shallow cover polymetallic tin deposits of Inner Mongolia, China. This study was supported by project grant no. 2024ZD1001502.