The Aberfan disaster was a collapse of a colliery spoil tip which led to the deaths 144 people - including 116 children. A colliery spoil tip is a pile of waste material removed during mining.

Where possible rock, brick and stone was removed from the colliery spoil so that it could be used to backfill the excavations and restore the land to its near-original profile, according to the ...

William and Catherine were visiting the village near Merthyr Tydfil which in 1966 was engulfed in ash slurry after a colliery spoil tip collapsed, killing 116 children and 28 adults. During a ...