Acoustic / Chirp surveys applied on Coal (A world first?)

Typical problems on coal mines include determining the thickness of coal left in the floor by historic mining<br>(potentially a large reserve of coal that can still be extracted), and identification and determination of the thickness<br>of sandstone partings located within coal seams. An additional problem encountered at Anglo Coal’s Bank Colliery<br>was determining the risk to planned underground workings beneath a dam- critical information required being the<br>bathymetry of the dam and the amount of sludge in the dam.