Mining and tailings
The geotechnical investigation determined that the remaining coal seam ranges in thickness up to 6 m and has been mined out of the adjoining pits to the extent where it is now approximately only 0.1 m thick. Efforts to access the remnants of the coal seam within the saddle has resulted in exposure of the coal seam to the elements. This was caused by undermining the high-walls, digging up the pit floors and creating cavities in the high-walls which have led to most of the challenges associated i.e. AMD, spontaneous combustion, collapse of the high-walls, structural damage to the school, subsidence, uneven topography, access and water pollution.