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Nantyffyllon incident update

An update from the Coal Authority on the incident reported today in Nantyffyllon, south Wales.

Coal Authority building

On Thursday, 31 December 2015, we received a report of a hole that had appeared in a pavement in Nantyffyllon. Our regional team responded quickly and visited the site to carry out an initial assessment of the collapse, which was measured at 3 metres by 3.2 metres and 4 metres deep. The collapse goes up to the edge of a residential building and extends slightly underneath the road.

Our initial site and desktop investigations have indicated that the collapse is unlikely to be coal mining related. However, we are continuing to work closely with the council while they carry out further physical investigation works.

If these investigations reveal that the cause was due to unrecorded historical coal mine workings we will undertake repair works as required.

To report a coal mine hazard please call 01623 646 333, 24 hours a day, 7 days a week. Details are available on

Published 31 December 2015