ABSTRACT
This case history presents geophysical and geotechnical investigations carried out over a mining site with the objective to identify the extent of possible palaeokarst features below a proposed extension footprint to a Tailings Storage Facility. The target of the detailed ground investigation was the Lower Carboniferous limestone units. A combination of geophysical methods was employed - seismic refraction, micro-gravity, and electrical resistivity tomography (ERT) - as a follow-up to the first two methods. Result found that karst features were infilled ("choked") with postglacial infill materials, including sand, silt, clay, and rock fragments. The case includes practical survey and planning considerations along with examples of interpretations and results.
