The planned uranium mine will extend under the public administrative area of Pécs at several points, thus the future tunnels will, to a limited extent, be drilled under residential buildings. Therefore it is very important for Wildhorse Energy to choose a mining technology which will prevent the deterioration of the affected buildings in the long term.
Uranium ore can be found in significant depths between 800-1,200 metres and naturally develops into areas of higher uranium density called ore lens. A several hundred metre thick, extremely hard sandstone layer is situated above the mine area. This covers the mining area as a domed roof in a stable manner preventing the layers closer to the ground level from moving.
Importantly the sandstone layer is also watertight, so the ground water from higher levels cannot filter down to the mine. This is why water leakage does not endanger the wells or streams to dry out or the surface to subside in the affected area. All of these naturally make the work of the miners easier, since significantly less amount of water will have to be pumped out during the mining activity.
This modern mining technology applies the method of backfilling waste rock into the abandoned mining areas. This solution helps avoid huge piles of waste rock on the surface on one hand, while on the other hand it provides support under the ground further stabilising the rocks above the tunnels.