Microgravity Survey to Detect Voids and Loosening Zones in the Vicinity of the Mine Shaft

A microgravity survey revealed no significant voids outside the lining of an active mine shaft at Wieliczka and Bochnia Royal Salt Mines, but identified a decreasing density zone at 42 meters depth in running sands that requires monitoring. The study also detected directional density changes across geological layer boundaries, including two between gypsum and other rocks. Surface microgravity surveys around three shafts—under construction, active, and liquidated—allowed researchers to map density distribution and assess potential threats to infrastructure by analyzing gravity anomalies. This non-invasive method proved effective in identifying subsurface risks without disturbing the mine structure.

Porzucek, S., & Loj, M. (2021). Microgravity Survey to Detect Voids and Loosening Zones in the Vicinity of the Mine Shaft. Energies, 14(11), 3021. https://doi.org/10.3390/en14113021